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CONDFN<l., COl -:

Motion Pictur. ,
Photography

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Coiorigfat 1920

SAMUEL F. FALK

CONTENTS

Introduction 5

History of Cinematography 7

Fascination of Cinematography ig

The Nature of Light 35

The Motion Picture Camera 53

Cinematograph Lenses 64

Focusing the Camera 76

Preparation for the Day's Work 92

How to Prepare Photographic Solutions 100

Development of the Negative 133

Making Motion Picture Positives 165

Tinting and Toning Motion Picture Films 177

Cutting and Editing 199

Exterior Lighting 206

Interior Lighting 220

Educational and Industrial Picture Making 247

Animated Cartoons 257

Trick- Work and Double Exposure 267

Composition by J. C. Warburg 288

Airplane Photography 304

How Submarine Movies Are Taken 310

Making Up for Motion Pictures 315

Relationship of the Cameraman to Other Workers 320

Applying for a Position 328

Bibliography 334

Appendix (Making Direct Positives) 347

Index 370

INTRODUCTION

ACKNOWLEDGMENT would be a more fitting heading
than the word Introduction. Acknowledgment is due to
many men and to many companies for material and illus-
trations used in the production of this book. So many sources
have been consulted for information that it is probable that the
editor, whose work of annotating and correlating for this book
has extended over a period of so many months of a busy life
filled with writing, directing, taking pictures, teaching and many
other activities, niay perhaps have missed giving credit where
credit is due.

For the main sources of information in the historical chapter,
the editor is indebted to Homer Croy, C. Francis Jenkins, Henry
V. Hopwood and, in a lesser degree, to many others.

Several standard text books on physics contributed to the
chapter on Light.

Preparation for the Day's Work, Relationship of the Camera-
man to Other Studio Workers. Applying for a Position, Trick
Work and Double Exposure, and ]Kirtions of other chapters are
from the pen of Charles W. HoflFman, a versatile photographer
and a deep student of photographic lore.

Photographic Solutions and The Tinting and Toning of Motion
Picture Positives are contributed in their entirety by J. I.
Crabtrce, of the Research Laboratories of the Eastman Kodak
Company.

F'or the chapter on Composition, the editor is indebted to
J. C. Warburg.

Cutting and editing were taken largely from articles by Edward
Koskam, R. J. Huntington and Alfred Biggs.

Publicity departments of film concerns and the apparatus
manufacturers have been exceedingly generous in supplying cuts
and photographs, credit for which is giveq in the legend under
the pictures which have been used.

The editor has written many chapters but since so many
authorities have been consulted and quoted without citing the
source, he should be considered more as the editor and compiler
of this book which seems to be needed by many workers and
friends of the motion picture industry. Its value is obvious for

those who have not the time or the opportunity to wade through
the extensive but sketchy literature on the subject to reach a
practical solution of the problems they may encounter in their
everyday work.

While a work of this size can be in no way exhaustive, the
editor has tried to retain as far as possible those details which
explain the fundamental principles of motion picture photography
to the average worker and at the same time serve as a guide and
reference in his daily routine.

No attempt has been made to cover the details of special sub-
jects such as cinematography in natural colors, photomicrography
with the motion picture camera, ultra-speed pictures, motion
study, etc., as any one of these subjects would easily require a
volume the size of this and still not do justice to the subject.

In a work of this kind mistakes are liable to occur and while
the manuscript has been carefully read and reread and the proof
sheets carefully corrected by different persons, errors both of
omission and commission may occur.

Should this Condensed Course meet with the success indicated
by the interest of our students it will undoubtedly pass into a
second edition in a short time. For this reason the editor will
be glad to receive suggestions and criticisms for the improvement
of the second edition.

Last, hut most important of all, the of!iciats and other in-
structors of the New York Institute of Photography have con-
tributed to the success of this work through hearty co-operation
and helpful suggestions from their actual experience of years
in teaching students the interesting subject of Photography.

To all those who have thus assisted in the production of this
Condensed Course in Motion Picture Pliotography, we wish to
express our heartiest appreciation.

n^^^<^

Sutton Manor, New Rochelle,
New York, April, 1920.

Chapter I

HISTORY OF CINKMATOGRAPHY

IT is noi impossible lliat some form of motion pictures was
known to Ilic Ancients. Titus Lucretius Carus wrote sev-
eral volumes entitled "De Renim Natura" at least sixty-five
years before the Christian Era, wherein book four, verse seven
hundred sixty-six appears the following, freely translated:

"Do not think thou moreover wonder that the images appear
to move and appear in one order and time their legs and arms
to use for one disappearance, and instead of it appears another
arranged in another way, and now appears each gesture to alter,
(or you must understand that this takes place in the quickest
time."

In the year A, D. 130, Ptolemy, a Greek philosopher, wrote
a scries of books on Optics, in which he not only described the
phenomenon of persistence of vision, but also described a piece
of apparatus in the form of a revolving disk with spots upon it,
which demonstrated this phenomenon. Persistence of vision is a
scientific term for the fact that the sensation of light coming from
an object remains in the brain for an appreciable fraction of a
second after the light has been extinguished. Whatever knowledge
the Ancients may have possessed of motion pictures is too remote
and too far buried in the murky depths of the past to be of
more than momentary interest in the history of Cinematography.

Tlic first step toward modern Cinematography took place about
the year 1833, when W. G. Horner patented the Zoetropc. or
Wheel of Life, which consists of a hollow cylinder turning on
a vertical axis and having its surface pierced with a number of
slots around the interior. Between the slots is a scries of pictures
representing successive stages of such a subject as a galloping
horse, and when the cylinder is rotated, an observer looking
through the slots as the wheel is rotated sees the horse ap-
parently in motion. Tlie pictures were drawn by hand, but
photography many years afterwards was applied for their pro-
duction. This did not occur until about the year 1877,

MOTION

PICTURE PHOTOGRAPHY

About the year 1872, Edwaird Muybridge, an Hnglisliman em-
ployed in the United States (ieodetic Survey, made photographs
of a race-horse iu motion. Muybridge made these at the in-
stance of several race-horse owners, who had come to a liot dis-
cussion regarding the gait and mode of locomotion of their
favorite steeds. Muybridge set up his camera with wet collodion
plates (dry plates did not come into general use until sometime
later) and made snapshots of race-horses at the Sacramento
race-track. A few trials demonstrated that unless he could show
rapid successive pictures of the horses in motion he could not
settle the dispute. The contestants made up a fund with which
he purchased twenty- four cameras and placed them at the edge
of the race course, close together in a row with a fine thread
attached to the shutter of each camera and stretched across the
racc-lrack, so that the horse in passing would break the thread
and release the shutter of the camera, and thus make an exposure
upon the sensitized plate. Each successive camera passed would
then show a slight advance in action, with the result that by tl»e
time the animal had passed in front of the twenty-four cameras,
he would leave a fairly accurate record which could be studied at
leisure The first results were not very satisfactory, as the
sensitiveness of tlie collodion plates was not sufficient to get
pictures in the small fraction of a second required to stop the
motion. To overcome this obstacle, a fence was built at the
side of the track in front of the cameras and painted black. If
the horse being studied was not white, lines were drawn upon
its limbs in white paint, so that with the help of the brilliant
CaHfomia sun, sharp well-defined silhouettes could be made at a
much greater speed than had hitherto been possible.

Leland Stanford, Governor of California at that time, and an
enthusiastic horseman himself, became very much interested in
Muybridge's experiments. Governor Stanford was a wealthy
man and furnished him with funds, to continue his animal study.
A studio was built at the Governor's private race-track in
Palo Alto, where Leland Stanford University now stands, and
in this studio were placed the twenty-four cameras. Here it
was that Muybridge conducted the major part of his experiments.
Having succeeded In analyzing animal motion, he now proceeded
to synthetizc his results: or, in other words, to reproduce the
movements of the animal so that they would be visible to the eye.

HISTORY

O F

CINEMATOGRAPHY

He finally produced a machine which would project the images
of the glass plate upon a screeii. He called this machine the
Zoopraxoscope, probably with the intention of setting a record
(or a double-jointed polysyllabic word, which many others have
tried to outdo. C Francis Jenkins, in one of the first volumes
ever published about motion pictures, gives a list of over a
hundred coined words, which have been applied to motion pic-
tures of which practically the only surviving one is Cinematog-
raphy. Some of them were: Symographoscope, Chronomatog-
raph, Chronopl'.otographoscope, Photokincniato scope, Phantas-
magoria and Getlhemoneygraph.

The Zoopraxoscope consisted of a large glass disk, with the
reproductions of the photographs set along its margin. A lime-
light was set up with a condensing lens, whicli would project the
picture on a screen. This glass disk revolved continuously and
the images on the screen were naturally blurred by this movement.
However, the introduction of a shutter allowed the light to pass
through each successive picture for a very short interval as
each image came into place. These rapidly succeeding pictures
produced the first moving picture on a screen.

It is interesting to note that in i860, twelve years before
Muybridge commenced his brilliant experiments the production
of motion pictures by photographic men had already occupied the
attention of scientists.

Sir John Herschel, the celebrated astronomer, who was also
a brilliant chemist, foretold nearly sixty years ago the method
used today in making motion pictures. It was he, who in 1819
discovered the solvent power of hyposulphite of soda on the
haloid salts of silver, thus introducing it as a fixing agent in
photography. His prediction of motion pictures was published
in i860 in the Photographic News, a leading journal of photog-
raphy at that time. He says : "What I have to propose may seem
to you like a dream, but it has, at least, the merit of being pos-
sible and indeed at some time realizable. Realizable — that is to
say. by an adequate sacrifice of time, trouble, mechanism and
outlay. It is the representation of scenes in action by photog-
raphy.

"The vivid and life-like reproduction, and handing down to
the latest posterity of any transaction in real life, a battle scene,
a debate, a public solemnity, a pugilistic conflict (Heenan and

MOTION

PICTURE PHOTOGRAPHY

Sayers prize fight took place i860), a harvest home, a launch —
indeed, anything, in short, where any matter of interest is enacted
within a reasonably brief time, whid) may be seen from a single
pcnnt of view,

"I take for granted nothing more than — first, what photog-
raphy has already realized or what we may be sure it will realize
within some very limited lapse of time from the present date —
viz., the possibility of taking a photograph instantaneously, of
securing pictures in a tenth of a second : secondly, tliat a mechan-
ism is possible, no niattcr how complex or costly — and perhaps
it need not be either the one or t!ie other — by which a prepared
plate may be presented, focused, impressed, displaced, numbered,
secured in tlie dark and replaced by another within two or three-
tenth seconds.

"In fact the dismounting and replacing need only be performed
within this interval; the other items of the process, however
numerous, following these up in succession, and collectively
spreading over as long a time as may be needful.

"There is a pretty toy called the phenakistoscope, which pre-
sents a succession of pictures to the eye, by placing them on a
wheel behind a screen, and bringing each in succession to an
opening in the screen of the size of the picture and thus allow-
ing it to he seen. The eye is in like manner covered by a dark re-
volving screen, having narrow liaear openings in it which allow
glimpses through them precisely at and only at the instant when
the pictures are in the act of transmitting the frame, and sensibly
in the middle of the area.

"By this arrangement it has been found possible to exhibit
figures in action, as dancers pirouetting, wheels revolving, etc.,
by having prepared a set of figures taken from one model pre-
sented at ^-arious angles to the visual ray.

"Coarse as the representations so made have been, the ap-
parent reality of movements has been very striking. The per-
sistence of the impression on the retina and its gradual fading
obliterates, or glosses over, the hiatus in a way which would
hardly be thought possible. Now there is nothing in the law of
periodicity as regards the movements of the model, to influence
the restilts, and we have only to substitute for such a periodically
recurrent set of pictures imperfectly drawn by hand, perfect
stereoscopic and simultaneous pairs of photographs duly prc-

HISTORY

O F

CINEMATOGRAPHY

sented to both eyes, in their natural order of succession to pro-
duce a stereoscopic picture in action."

In 1878, Muybtidge published the results of his experiments,
which excited great interest both in this country and in Europe ;
particularly among artists who had always been puzzled as lu
the correct attitude assumed by animals in locomotion. As soon
as the results of Muybridge's experiments were published, de-
mands came for him to appear before various scientific bodies to
demonstrate his discoveries. His first appearance in Europe was
in the laboratory of Dr. E. J. Marcy in 18S1, where he lectured
to some of the foremost savants of France. Dr. Marey, himself,
was intensely interested and established a studio for investigation
of the motion of animals by similar photographic methods. He
had already invented an instrument called the Marey Photographic
Gun, which was shaped somewhat like a monster revolver and
look twelve quickly successive images of a moving object, re-
cording them upon a circular sensitive surface.

When Muybridge returned to this country, the University of
Pennsylvania offered to equip a studio for him and furnish funds
for carrying on his investigations. The studio, one-hundred-and-
twenty feet long, was built on what is now known as "The
Hamilton Walk" on the University campus. To carry his work
much farther, he had to find a method of getting quicker ex-
posures. He determined to solve the problem and achieved mar-
velous results, making many advances in the science of Photog-
raphy. So well did he succeed that some of his photographs are
unexcelled at the present day, many of them having been taken
in the one-sixth thousandth part of a second.

Tn 1887. Muybridge, in collaboration with Dr. Edward Reichert,
professor of Physiology at the University, made the first in-
stantaneous pictures in medical research. A dog was given an
anaesthetic, its chest opened, and the successive phases of the
dilation and contraction of the heart were photographed. Thus
the first motion picture record displaying the movements of any
internal organs — human or animal — was made.

In February, 1888, Muybridge went to Thomas A. Edison, the
inventor of the phonograph, and asked if his zoopraxoscope and
the phonograph could not be synchronized so as to give the simu-
lation of people speaking. Edison had not yet perfected the
phonograph so that it was loud enough to be heard by a large

MOTION

PICTURE PHOTOGR^^HY

audience and therefore could not consider the project at that time.

Muybridgc published a book, "Animals in Motion," which is
now used by artists in their studios, so that they may correctly
delineate their subjects. It has proven a mine of information
to those who produce animated cartoons and diagrams.

In 1893, at the Chicago World's Fair, Muybridgc exhibited
more than twenty thousand original photograplis in his machine
for showing them. In recognition of this the commission of the
Exposition awarded him a certificate of honor. This marked the
practical completion of Muybridge's work, as he was then an
old man. He devoted more than twenty years of his riper
maturity to the advancement of pictured motion. It is true that
compared with the motion picture of today, his results were crude
but they were pictures in motion nevertheless and he is honored
and respected as tl»c father of Motion Pictures.

Inspired by the work of Muybridge, many other investigators
sought to produce the simulation of life upon the screen. Dr.
E. J. Marey of Paris, was the most prominent of these. In
1S90, he first used the celluloid roll fihn, which had just been
given to the world through the efforts of the Rev. Hannibal
Goodwin and George Eastman. Even before this, others had
made partially successful attempts at using a flexible support for
producing successive pictures from a single view point. As
presented by Muybridgc with his twenty-four cameras, the re-
sult achieved was the same as the modern device of moving a
motion camera in an automobile or on a moving truck, traveling
at the same speed as the object photographed — in other words,
the object on the screen remained stationary, white the back-
ground moved past like a panorama.

Dr. Marey decided that the pictures must be taken from one
pCTnt nf view and applied himself to perfecting a camera which
would take photographs in rapid succession from the same view
point. In this he was successful, but, on account of the limita-
tions imposed by the weight of glass plates, was unable to take
more than a relatively small number of pictures at one time.
Not only did the employment of glass slides require very elab-
orate mechanism, but tlie quantity of glass necessary prohibited
the showing of more than a few short phases of action.

In 1876, Wordsworth Donisthorpe patented a mechanism for
making photographs on a deck of glass plates, like a deck of

••UARKUEVIL" LT. O. U LDLKLEAR AND MILTON MOORE.
HIS rAVERAM.\X.

1 S T O R Y

O F

CINEMATOGRAPHY

cards, pushed to the focus of the lens and exposed, one at a time,
then dropped down and out of the way of the next plate, at the
rate of eight exposures per second. In his patent he makes this
claim. "If the apparatus be arranged to take successive pictures
at sufficiently short intervals of time, they may be printed at equal
distances upon a continuous strip of paper. This paper, with
the series of pictures upon it, may be used in the instrument
known as the Zoopraxoscope, or Wheel of Life. To allow of
this, the strip of paper may be wound on a cylinder to be un-
wound from it, at a uniform speed, unto another cylinder, and
carried past the eye of the observer, any ordinary means being
used for any showing that each picture shall be exposed momen-
tarily to the obscn'cr. V>y this means, the movement made by a
person or group of persons, or of any other objects during the
time they were being photographed, may be reproduced to the
eye of the observer." With tliis apparatus he photographed and
reproduced growing grass, buds developing into flowers, and
the metamorphosis of frogs. Thus he was the first to take "stop
motion" pictures.

The period from 1889 to 1893 might be termed the gestation
period of wlaat we still love to term our infant industry.

The invention of the motion picture is ascribed by many to
Iwmas A. Edison, but so many other scientific men were busily
engaged in trying to solve the problem of producing motion
pictures in a conimerciat way at this time, that it is difficult and
probably unjust to give the credit entirely to any one man.
Dr. Marey, so far as is known, was the first to use the flexible
leet celluloid, but it is probable that the same instant that Dr.
rlarey was carrying on his experiments in Paris, W. Fricsc
Greene and M. Evans were using paper film for the very same
^^urpose in Enj^land. In 1899, they filed application for patent
Hbn a machine for taking and projecting moving photography by
^Blneans of a ribbon of successive photographs. On the other
^Piand, a brochure published in 1895. and bearing Edison's entire
endorsement, lays claim to his being the prior inventor as follows :
In the year 1887, Mr. Edison found himself in possession of
ne of those breathing spells, which relieved the tension of in-
ventive thought. It was then that he was struck with the idea
of producing on the eye the effect of motion by means of a swift
;nd graded succession of photographs. The initial principles

MOTION

PICTURE

PHOTOGRAPHY

of moving images was suggested to hiin by a toy, the Zoopraxo-
scope, or Wheel of Life. It was determined to revolutionize the
whole nature of the proceedings, by instituting a series of im-
pressions fixed to the outer edges of a swiftly rotating disk
supplied with a number of pegs, so as to project from under each
picture on tlie rim. A Geissler tube was placed, connected with
an induction coil, which, operated by the pegs, lighted up the tube
at the precise moment when the picture crossed its range of
vision."

Curiously enough, during all of this period, when men like
Marey, Edison, Evans, Demcny, Donisthorpc, Jenkins, Anchuetz,
and many otliers were working upon the problem of photograph-
ing pictures in rapid succession, very little attention was paid to
the problem of projection, because their ideas were centered upon
Ihe use of the pictures for individual observers in coin operated
slot machines. Although a number of the patent sijecificatjnn*;
include the use of the camera mechanism, or a similar mechani.sm
for purposes of projection, very little actual work seems to Iiavc
been done toward solving the problem of presenting motion pic-
tures to a multiple audience. Numerous authentic examples of
motion pictures taken by various inventors at this period are in
existence today, but it is probable that the first public exhibition
to an assembly of people was given by C. Francis Jenkins on June
6th. 1894, in his father's shop at Richmond, Indiana. Jenkins
was at that time a stenographer in the treasury department at
Washington, D. C, and, in his spare time had been experimenting
in the making of motion pictures.

Jenkins writes of his first inception of interest in the subject
as follows:

*'In 1885, while standing one day on a high prominence in th«
Cascade Mountains, I watched the reflections of sun-
light from the axes of some working men clearing the right of
way for a railroad in the valley below. The reflection from two
or three hundred axes produced a peculiar scintillating and
beautiful effect From that moment I date all of my efforts to
achieve what finally resulted in the perfection of the chrono-
photographic apparatus I have built and used.

"My experimentation was dependent upon what could be spared
out of a small salary. This is my excuse for the delay in com-
pleting a commercial machine after the first conception of the

HISTORY

CINEMATOGR

pliantoscope, which is simply a fanciful name £or the various
devices 1 have employed in this work — the different steps of
n-hich may readily be followed by an inspection of the old ap-
paratus now on exhibition in the United States National Museum.

"My active efforts were begun in 1890. Of course, first of all,
pictures were to be secured. The first apparatus built for this
purpose consisted of a rachet rotated drum, upon which the 61m
was wountl to feed it past the point of exirasure. The camera
made a succession of pictures upon this film by short exposures —
the film being jerked forward the width of one picture in the
interim. Two shutters were supplied — one with a narrow open-
ing employed when the apparatus was used as a camera, and the
other having an opening three-fourths of the complete circum-
ference of the disk employed in reproducing the pictures. The
amount to cut away in the shutter was determined wholly by
experiment. Tlie film was wound upon the drum intennittently
by a pawl and rachet arrangement. In reproducing the pictures,
an oil lamp was used to project them upon a small screen. By
accident the camera was foimd to be so constructed that it would
take pictures without a shutter.

"This seems at first glance incredible, but as the film gets only
just sufficient exposure during the period of rest, the light is too
weak to affect it during the movement of the film, for if five
pictures per second were made and the exposure exceeded by
fifteen times, the time necessary to move the unexposed por-
tion of the film into position, and the period of exposure should
he just Siifficient to make a fully timed picture, then the remaining
one-three-hundredth part of a second would be too small to per-
ceptibly affect the film and a shttttcr would be unnecessary.

"In these early experiments, the film was not perforated. At
this time, the manufacturers did not keep a stock of film of any
u-idths in considerable lengths. This convenience came later.
So the longest film obtainable was split in the widths of about
two and a half inches by drawing wide film beneath knives set
in a board,"

Tilts first exhibition at Richmond, Indiana, could not be prop-
erly termed a public exhibition, as no admission fee was cliarged,
but he followed this with a public exhibition in August, 1895 at
the Cotton Stales Exposition in Atlanta, Georgia. So incredulous
were the people at the exposition that less than one hundred per-

MOTION

PICTURE PHOTOGRAPHY

sons could be induced to pay an adnussion fee of twenty-live
cents to see motion pictures — a word which had not then been
coined. The ballyhoo, or announcer, failed utterly to convey to
the minds of the passing poj)ulace what they would see in llie
exhibit. Finally, in desperation, he decided to invite the crowd
to enter for nothing, and after tlie show was given, it was ex-
plained from the platform that those who so desired, might de-
posit a coin in the ticket box as llicy went out.

The interest aroused by those who saw the exhibition was such
that it promised to be a success, but just as the young inventor
had commenced to spend in his imagination the money he would
make, a fire broke out in one of t!ie neighboring concessions, de-
stroying not only the exhibition hall, but a number of buildings
surrounding it.

Between the time of exhibiting the pictures in Richmond,
Indiana, and the unfortunate catastrophe at Atlanta, Jenkins
formed a partnership with another young man, Thomas Annat,
who had worked with him in building the two projecting ma-
chines which they took to the fair at Atlanta. Armat's father '
was a manufacturer of some means, so Armat was able to continue Ju
his experiments while Jenkins was compelled, for financial rca- '
sons, to return to work in the Treasury department. Jenkins
inability to devote his entire time to experimentation resulted *
a breach between the co-workers, which finally resulted in
number of legal controversies which dragged through the cofti,.
for a long time.

Discouraged by lack of popular interest in his projection r..d-
chine, Jenkins came to believe that it was of interest only ti
scientific bodies, and on December j8th, 1895^ read a paper
before the Franklin Institute of the state of Pennsylvania, in
which he described and showed in detail the working of the
Phantoscope. •^■

Meantime, Armat, working independently, made another rw-
chiue, which he showed to Raff and Gammon, a firm largely in-
terested in the penny peep shows prevalent at that time. They
were the agents for the Edison coin-controlled Kinctoscope,
which exhibited to one person only. Raff and Gammon did not
display much interest in the Armat machine until the next year,
when Jenkins set up his machine in a hall at Atlantic City
directly opposite a peep-hole show. The managers of the slot

HISTORY

OlNEMiATOGRAPHY

machine arcade complained to their principals in New York, who
investigated the cause for the falling off of patronage. People
found it much more comfortable to sit in an orchestra chair and
watch the pictures on the screen than to stand in an awkard
position at the peep-hole of a slot machine. This stimulated
Raff and Gammon to a new interest in the Armat machine, for
although Edison had been working upon a projector, he had
abandoned it for other matters. Raff and Gammon, therefore,
made arrangements to have the Armat machine, which was
copied from Jenkins' original model, manufactured in the Edison
shops to be put out as the Edison Vitascope. The following
letter frpm Raff and Gammon to Armat shows how the original
Jenkins' invention came to be known as the Edison machine :

"Kinetoscope and phonograph men and others have been
watching and waiting for a year for the announcement of the
perfection of the Edison machine which projects kinetoscope
views upon a screen or canvas. No matter how good a machine
{.hould be invented by another, and no matter how satisfactory or
superior the results of such a machine invented by another might
be, yet we find the greatest majority of the parties who are in-
terested and who desire to invest in such have been waiting for
the Edison machine and would never be satisfied with anything
else, but will hold off until they find what Edison can accomplish.
We find that many of these parties have been approached in
the last few months to invest in other similar machines, but they
hesitate to do so, evidently believing that Edison would in due
time perfect and put out a machine which would cast the others
in the shade.

"'Tliis being the case, you will readily reach the same con-
clusion that we have — that in order to secure the largest profit
in the shortest time it is necessary that we attach Mr. Edison's
name in some prominent capacity to this new machine. While
Mr. Kdison has no desire to pose as inventor of this machine, yet
we think we can arrange with him for the use of his name and
the name of his manufactory to such an extent as may be neces-
sary to the best results. We should, of course, not misrepresent
the fact to any inquirer, but wc think we can use Mr. Edison's
name in such a manner as to keep within the actual truth and yet
get the benefit of his prestige. The machine might be made with
a place upon which we could inscribe the words "Armat Design"

MOTION PICTURE PHOTOGRAPHY

or something of that kind, and you understand that after we have
disposed of our territory and the business is fully eslablishcd,
and we have reaped the respective rewards, we will thee make it
our business to attach your name to the machine as inventor, and
we are confident that you will eventually receive the credit which
is due you for your invention. We regard this as simply a matter
of business, and we trust tliat you will view it strictly in this
light."

Jenkins and Armat. before their dissention. had made a joint
application for patent, which had not yet been issued on account
of the friction between them. Armat, in order to dear the
situation between them, offered to buy Jenkins' interest in the
joint application, and finally induced him to accept twenty-five
hundred dollars in cash for his interest. Having disposed of
his principal asset in the infant industry, Mr. Jenkins turned his
major attention to other inventions, and ceased to be a factor in
the game until recently he entered extensively into the manu-
facture of projecting machines and also organized the Society
of Motion Picture Engineers.

Having thus briefly reviewed the early history of the motion
picture up to the point where the first crude projectors of the
present type were evolved, we will leave this subject to pass on
to present-day practices. To give even a skeleton synopsis of
the development of the industry from that time to this would fill
several volumes the size of this. The student who wishes to
delve into the past can consult the many books mentioned in the
bibliography and the bound volumes of motion picture periodicals
in the libraries.

Chapter II
FASCINATION OF CINEMATOGRAPHY

MOTION picmres cover a field that is almost universal,
and the person who is skilled in taking pictures with the
cinematograph camera, or interested in any of the pur-
suits intimately connected with its operation, practically has an
unlimited field in which to exercise his creative energy.

Wander-lust, the desire to see strange countries and foreign
pec^lcs. is a longing which many possess, but few are able to
satisfy. Many a man with a longing to travel and see the far
stretches of the world has been able to pay all the expenses of
his globe-trotting, and pocket a bonus, by taking along a motion-
picture camera and bringing back to his less fortunate friends
an interesting intimate reproduction of the sights and scenes
which have held his interest during his journey.

The making of dramatic pictures covers a field of ever vary-
ing novelty that is the very antithesis of monotony.

There is scarcely a trade or profession in which cinematog-
raphy has not important and direct relation to its improvement
and expansion.

There is no doubt that by the aid of the motion picture, the
duration of the great world war was very considerably shortened.
In no other way could the tremendous amount of propaganda
and information concerning the war situation have been made
dear to the populace. The committee on public information, in
conjunction with the government, sent out thousands upon thou-
sands of feet of motion picture film, showing the activities of the
government and of the army and navy. All of the allied war
charities attribute their ability to raise tremendous sums for phil-
anthropic purposes mainly to the agency of motion pictures.
Thousands of men and women were engaged in making propa-
ganda films of all kinds. The war loan committee, aided by the
motion picture industry, made thousands of feet of film to stim-
ulate the loan drives.

1»

In educating and training our army and navy, the motion pic-
ture was of incalculable value. So remarkable have been the
results achieved in the training of men by the use of motion
pictures that it is freely and confidently predicted that tremendous
and important as is the production of motion pictures for amuse-
ment and entertainment purposes, in a comparatively short time
to come that use will be relegated to a position of insignificance
in comparison with the tremendous production of motion pictures
for educational and pedagogical purposes.

In the making of these pictures, thousands of craftsmen have
yet to receive their training. The government of the United
States, realizing the tremendous importance of motion pictures
as an educational factor, is establishing a bureau in Washington
for the production and distribution of educational pictures to
be used by schools, churches, colleges, community organizations,
and welfare units. The ^m manufacturers, who have hitherto
been blind to the educational possibilities and the financial op-
portunities presented, are now eagerly seeking to make up for
lost time and are hastening their preparations to supply the
rapidly growing demand for this kind of picture.

"Educational" is a much abused word, which, in the past,
generally meant to the exhibitor and show-man, a scenic picture
or an industrial picture of haphazard construction, which, more
often than not, acted as a chaser to drive people from the theatre.
Gradually, producers of scenic, industrial, and educational pic-
tures came to realize that unless their product was made with
the same care, as or even greater care, than that devoted to the
production of dramatic pictures, they could not continue to exist
Today, people of specialized training in nearly every profession
are being employed in the studios and laboratories of producers
of educational pictures in order to make them more interesting
and instructive.

Thousands of manufacturers are using motion pictures to in-
struct and amuse their employees, and have found in them, one
of the most powerful antidotes for labor troubles and social
tmrest. In no other manner can the destructive conditions caused
by labor troubles be so forcibly and favorably impressed upon the
mind of the workers.

All of this is quite aside from the use of motion pictures (or
the advertisement and exploitation of the manufacturer's pro-

FASCINATION OF CINEMATOGRAPHY

duction. Here is another avenue for the disposal of the product.
One of the greatest problems in connection with the demonstra-
tion of large and not easily portable pieces of machinery has been
that the customer could not sec these machines in operation.
Today the manufacturer's salesman can carry a portable projec-
tion machine, less heavy and cumbersome than a well-packed
suit-case, with a reel or reels of film, with which he can demon-
strate upon the walls of his customer's office ali of the possibilities
of which the machine is capable, with far greater brevity, and
often, with greater clarity than he could demonstrate the actual
machine in operation. By means of close-up views, enlarge-
ments, and animated diagrams, he can show details and features
that could not be demonstrated even by the operation of the ma-
chine itself.

For the production of pictures of this kind, thousands of
camera and laboratory and technical workers must be trained.
Authors of industrial scenarios, directors, who understand the
intricacies of complicated machinery and of industrial and manu-
facturing processes; camera operators, who can photograph
the things which the directors wish to show ; title writers and
film editors for placing the photographer's scenes in logical and
interesting continuity : laboratory woricers to turn out prints of
the highest photographic quality, tinted and toned in attractive
colors; all are needed for this rapidly growing industry.

The film reporter, gathering the topical news of the day with
his motion picture camera, lives a strenuous but intensely in-
teresting life. He must be ready at a moment's notice to take
his grip and motion picture outfit and travel to any point on the
globe to feed the insatiable appetite of the news-loving public for
minute details of the latest event. In the larger cities, the big
theatres arc slow indeed, if they do not throw upon the screen
on the same day that it happens, any event of importance taking
place within two or three hours' ride of the city.

Resides the news events, thousands of short subjects of more
general interest have brought the Animated Screen Magazine
into existence. In the same way that the animated newspaper
satisfies the curiosity of the public for the latest news, the screen
magazine treats all the latest topics of the day in much the same
manner as the popular magazine. It has this advantage over the
magazixie, compelled to confine itself to cold type and still pictures ;

MOTION PICTURE PHOTOGRAPHY

it can show operations, movements, and animated diagrams in
a few seconds' time, that pages of print could not haU so
adequately explain.

It is obvious that this branch of the business must fall largely
into the hands of the unattached or independent worker, who
bears the same relation to the picture theatre as the outside
correspondent to the newspaper. A firm engaged in supplying
news films cannot hope to succeed without amateur assistance.
No matter how carefully and widely it distributes its salaried
photographers, numberless events of interest are constantly hap-
pening—shipwrecks, accidents, fires, sensational discoveries,
movements of prominent persons, and the like, at places, beyond
the reach of the retained cinematographer. For film intelligence
of these incidents the firm must rely upon the independent
worker.

Curiously enough, in many cases, the amateur not only executes
his work better than his salaried rival, but often outclasses him
in the very important respect that he is more enterprising. Act-
ing on his own responsibility, he knows that by smartness alone
can he make way against professionals. Only by being the first
to seize the chance can he find a market for his wares. Thus
when Bleriot crossed the English Channel in his aeroplane it
was the camera of an amateur that caught the record of his
flight for the picture theatres, although a corps of professionals
were on the spot for the purpose. True, the successful film
showed many defects. But defects matter little compared with
the importance of getting the picture first or exclusively. Plenty
of similar cases e.xi.st. The amateur has an excellent cliance
against the professional. His remuneration, too, is on a gener-
ous scale. The market is so wide and the competition so keen,
especially in New York, the world's centre of the cinemato-
graphic industry, that the possessor of a unique film can dictate
his own terms and secure returns often twenty times as great
as the first cost of the film he has used.

Aside from the wide field of entertainment to which most of
the products of the motion camera are devoted it is daily broad-
ening its scope in the field of scientific investigation. Technical
laboratories are daily finding new and diverse problems in the
solution of which the cine camera plays an important role.

Scientific research has received a mighty and tremendous im-

FASCINATION OF C I N E M A t O G R A P H Y

petus in this country through the conditions arising from the
great world conflict. We arc just beginning to realize how de-
pendent we have been in allowing foreign brains to solve for
us the great bulk of the more complex industrial processes and
the awakening 6nds us determined and able to take and retain
the leadership in this important task.

Efficiency means the elimination of waste — one of our greatest
wastes is time waste ; every excess movement wastes a precious
interval of time ; the cine camera has become a detective, sleuth-
ing out the thieving excess motion which steals valuable time.

Frank Galbraith, a noted efficiency engineer, has, by the use
of motion pictures, succeeded in eliminating false and useless
motions to such an extent that various factory operations have
been speeded up so the output has been increased as much as
three and four hundred per centum. Marvelous as it may seem,
the worker was able to turn out this increased amount of work
with much less fatigue than when he had done a less amount
under the haphazard regime.

When the motion camera is used for time studies, a split-
second clock is generally placed in the picture and photographed
at the same time, thus giving an accurate record of the time in-
terval between each frame or picture on the celluloid tape.

Percy Haughton, the Harvard football coach, has adopted the
motion camera for revealing the faulty and unnecessary motions
of players on the football field. Every fraction of a second
gained on the athletic field is a big boost toward victory.

A picture released about a year ago by one of the large com-
panies excited much comment and illustrated how motion pictures
may prove of great service in correcting faulty muscular action.
The picture showed an athlete Jn various simple g>'mnastic feats
such as walking, running, jumping and shot-putting, taken simul*
taneously with two cameras. One camera took the action at
the ordinary rate of sixteen pictures per second, while the other
camera made one hundred exposures to the second ; the normal
and the ultra-speed pictures were projected one after the other
at the norma! rate of projection thus prolonging or amplifying
the uhra film to nearly six times the duration of the normal
motion. It was very weird and interesting; the case and de-
liberation of the prolonged action gave time for the study of
every movement and the play of every muscle. One could not help

MOTION

PICTURE

PHOTOGRAPHY

but marvel at the co-ordination o{ the work of the muscles. The
figure of the athlete seemed like a diver immersed in crystal
clear water, the buoyancy of which floated him through the grace-
ful attitudes of his movements.

As ordinarily shown, motion pictures are taken and projected
at the rate of sixteen pictures per second, but for the scientific
investigator the rate of speed may vary from as high as 30^00
to the second in the study of high speed phenomena to as low
as one exposure per hour or even one exposure per day, as used
in studies in the change of structural materials, or the growth of
a plant. All of these may be projected at normal speed for
screen study or each frame may be subjected to individual
scrutiny under the magnifyinj; glass in special cases as in seeking
to eliminate lost motions in machine assembly, etc

Reduced to normal projection speed, bullets swim across the
screen like leisurely fish and bursting shells separate like a group
of mosquito wrigglers. Many high speed processes, such as the
flow of steam; air and gases; combustion and explosions; auto-
mobile engines; the action of governors; the synchronism of
electric generators; the flow of water in turbines and water
wheels; the action of steel and wood-working machinery; and
machine tools; etc., may be photographed at high speed and
slowed down in projection so that they may be studied with the
greatest accuracy.

Chaptek III
THE NATURE OF LIGHT

AS the whole structure of photography rests upotl the ap-
plication of the science oi physics and chemistry, the
student of photography or of cinematography can never
be too well informed upon these subjects. While we shall en-
deavor to merely touch upon the more important principles of
physics and chemistry which are most intimately concerned in
their relation to photography, it would be well for the reader,
who is earnestly in search of information, to dig up his high-
school text -books and study the subjects of the physics of light
and the chemistry of the salts of silver. If he has no such books,
he will find a mine of interesting information in the public lib-
raries, which arc so numerous over the country that there are
very few who do not have access to them. He who has con-
sidered these subjects dull and uni uteres tin(^ will find they con-
tain an unsusi>cctcd interest when he comes to trace their relation
to and use in photography. It is not necessary to go deep into
these subjects to get the simple facts upon which photography is
based. When one has a clear conception of these facts, they will
form a firm foundation upon which to build a sound structure of
photographic knowledge. New facts acquired will then fit upon
this foundation like bricks into a wall. If the student is uncertain
» to what books to consult to acquire the knowledge which he
wishes, he may find some assistance in consulting the bibliog-
raphy or list of suitable text-books given in another place in this
volume.

It is hardly two hundred years ago since people first had any
adequate idea that our atmosphere exists and that we live and
move about at the bottom of a sea of air — ^the weight of which
presses upon us and all other objects about us with a pressure of
approximately fourteen pounds to the square inch. With our
present day knowledge gained from barometers, air-ships and
balloons floating in the air, and from hundreds of other common
facts, we accept the presence of the atmosphere as a matter of
course.

MOTION

PICTURE PHOTOGRAPHY

The existence of an all pervading ether is, however, somewhat
more difficult to grasp. Aluch like our knowledge of the air. its
existence is only an inference from observed facts. Ether is an
all-pervading medium in which the entire universe is submerged,
and by means of radiation or vibration, are transmitted light,
radiant heat, actinic radiation, X-rays, electro-magnetic oscil-
lations, magnetism, and Hertzian waves. Of these forms of
radiant energy, light, or those radiations which enable the eye to
see objects, arc the only ones with which we are to deal.

Light is transmitted through the ether in straight lines, by very
minute waves or vibrations, which travel with great rapidk)'.

For purposes of comparison, we often refer to the similarity
of light waves to sound waves, but sound waves are carried by

Fi«. 1.

A B rtprcwnu « initiate s«ctJon of s rar of ligbt travflini ia the
direction iadlcaUH by ifae arrowx. Ttw curved line represents light
wftves. The distance from crcrt to cre« at two consecutive waves
is the wave length de«ig:nst«d by C The distance Rr from tbe
emt to tbe bottom of tbc curve is called the amplitnde of vibiatitin.

the atmosphere at a comiparatively slow rate. It will be noted
when viewing the steam emitted by a whistle at some distance
from the observer that the steam is seen some little time before
the sound is heard, showing that the light waves from the object
travel much more quickly than the sound. Ether waves do not
correspond to sound waves in some other respects. For instance,
sound waves are composed of alternate compressions and refrac-
tions, while the wave movement or displacement in light waves is
from side to side at right angles to the direction in which the
light wave is traveling.

Figure one is an illustration of the movement of light waves
from side to side as it might appear if it were possible to magnify
a ray of light and render it visible. Light itself is not visible.
When we say we see a ray of light, as we sometimes do when the

THE NATURE OF LIGHT

sun-shine falls through a window or through the foliage oE trees,
we do not actually see the ray of light — what we see is small par-
ticles of dust floating in the atmosphere which show us where
the ray of light b passing. The particles of dust reflect to our
eye a small portion of the light which comes through the window
or between the leaves, as the case may be. In ordinary diffused
light, these particles are too small to be seen, but under the strong
light of the sun. each particle becomes a tiny luminous point.

/ N.

Fig. a.

Thi« drtwing U tn «l(nnpt at showini figure one in perspective

with the purpose of rcvealins the Eaci that the curred line of 6cure

one not on\j extends up and down but io trtrj conccivsblt dlrec

tion «t right snglea to the direction of pro[>B8ation A. B.

For an experiment to prove this, turn the light of a projection
machine on in a quiet room, and if the atmosphere has not been
disturbed so as to stir up dust, the path of the light will not be
visible, but if we stir up a little dust, or blow a puff of smoke in
front of the machine, we will see the path of the light spring out
so that we can see it distinctly.

To return to tlie vibration of the ether waves back and forth
in a ray of light, we see that in the first diagram the waves arc
represented as traveling like the crests and hollows of waves on

MOTION PICTURE PHOTOGRAPHY

water, which move forward without moving the water which
con^ses them forward. This we know, because a boat floating
upon water agitated by waves, docs not move forward with the
waves, but simply bobs up and down in the same spot. In the
same manner, light waves pass through the ether without the
ether moving forward in the direction of the waves. There is a
difference in the light waves and the water waves, however; for
while the waves in water move up and down only, the vibrations,
or waves, which occur in the ether, take place in every conceiva-
ble direction — sideways as well as up and down. Figure 2
represents a cross-section of a ray of light in which tnay conceive
that the wave or ray is vibrating back and forth in every direc-
tion within the limits of a circle.

Waves of light pass through any transparent medium, which
may be air, glass, water, celluloid, amber, or any other substance
through which we can see. As long as light travels in the same
substance or medium, it goes forward in a straight line, but as
soon as it strikes the surface of a different medium, it is de-
fleeted or bent at a slight angle, depending upon the nature of
the substance, and does not bend again until it encounters another
mediimi. This is called the rectilinear propagation of light, which
simply means, as before stated, that in any particular medium —
whether air, water or glass, light always travels in straight lines.

The principal sources of light are from objects heated to a
high temperature. The most common source of light is, of
course, the sun, which is a heavenly body incandescently hot. In
the arc light, the light is emitted by the carbon tips heated to in-
candescency by the passing of the electric current Incandescent
lights give forth liglit because their filaments are heated by the
passing of the electric current. Ordinary kerosene lamp flames
are luminous, because of the hot particles of carbon in the flame.
Bunsen burners and alcohol lamps give forth very little light,
because there are no solid particles in their flames to be heated
to incandesccncy. There arc exceptions to this rule of light
being accompanied by heat, such as the glow of the glow-worm,
phosphorescence of phosphorus, and light from some kinds of
electric discharges. These exceptions are not very well under-
stood and are seldom of any use in connection with photography.

In the Cooper-Hewitt lamp, >-apor of mercury ts rendered in-
candescent by the passing of the electric current A luminous

THE NATURE OF LIGHT

body, that is, anything giving forth light, sends forth the light
in all directions from itself, just as a pebble dropped on the
surface of quiet water sends out ripples which leave the place
where the pebble dropped in ever-widening circles. Do not be-
come confused by the idea of the circle. Remember that any
point on the crest of any of these ripples or waves has come

Kit. t.

TU> Jiac*™ roQcklr llliutrttet bow • lumiaoiu point S ndUlet

lifhl outwmrdly Ed mrf direction like the f&dii of ft ■phtre, in

tkii CMC tbe Gfurc repreaeoU * croM-scctioo of lucb a apkere.

outvrard from the pebble in a straight line. In a similar way,
light waves move out in straight lines from their point of origin,
not only in one plane, as the ripples do from the surface of the
water, but in every directioa (Fig. 3.).

HISTORY

O F

CINENtATOGRAPHV

light falling upon A, or conversely, the intensity of the light
falling upon A is four times the intensity of light on screen B.

This law of illumination must be taken into account very par-
ticularly where artificial illumination is used, for if it takes a ccr-

•v_^''Z7S£

Fir s.

Wfaco • njr of liskt itriltc* koothcr mfdium of irtftler «r Uwer
dcntity than tli« one it >• leaving then, unlex it ctrikei exactly
peipvadicuUi' to the surface of tbe new m«tiuin, it will be bent
or refracted. Figure 0 ahowt a ray pasatng ihrougb a tilock of
fUM and tuffering two refractions, one upon entering and one
upon leaving. In tbia caac tfac two lurfacca being paraJIel, the
first refraction ia ncutializeJ by the wcond and the Ught t»j c«a-
ti&uea fa ill arlginal direction sligbttr dltplaccd but parallel to
it) original course.

tain number of lights to illuminate a certain small set properly,
it will require four times as many lights to properly illuminate a
set which is only twice as large. Therefore, it is practically im-
possible to artificially illuminate a very large set since the limit
of the practical number of artificial hghts is soon reached.
When light strikes an object, part of it is reflected or thrown

THE NATURE OF LIGHT

back. It is because of this fact that wc are enabled to see objects
and to photograph them. The kind or quahty of light reflected
enables one to photograph objects. The violet h'ght is quite
active photographically, while tlic other end of the spectrum,
red, is not.

If the object reflects all blue or violet the photographic scnsi-
live surface will be strongly affected and the object easily photo-
graphed, but if the object reflects yellow and red* waves only,
the sensitive surface will be only feebly affected.

RED_
0R««£_

Ptfr «.
Proftnction «f llic ypvctmm fay mant of i prink

It is for this reason that photographic operations are carried
on in dark rooms which are illuminated only by faint red or
orange light. All dark room lights should be carefully tested
by exposing a sample of the most sensitive surface that is to
be worked under ihe light in question for a greater period of
time than such sample would be exposed under any ordinary
working conditions. If on development the sample shows traces
of fog, the light should be changed or its intensity decreased.
When a certain color of light predominates, the unaided eye is
not able to distinguish a contamination of another color, con-
sequently wherever possible it is very desirable to make a spectro-
scopic examination of the light passed by screens used for dark
room iUumination.

»8

HISTORY

O F

CINEMATOGRA PHY

From this it will be seen that much depends upon the quality
of light reflected in photographic work.

Refraction — When light passes from one medium to another
of different density it is refracted or bent as shown in diagram
No. 5. The different colored rays being refracted or bent in
different degrees. Upon this principle depends the construction
oE lenses.

Dispersion is shown in diagram No. 6 that is, light in passing
through a glass prism is separated into its component parts, and

FiK. T.

Showing <he clctncnUrjr cbiractcr of a pHmarr color. Primary
color* cannot he further resniwd into ether colora.

in case of white light into the spectrum colors violet, indigo,
blue, green, yellow, orange and red.

Absorption — When light falls on an object which neither re-
flects, refracts nor transmits, the light is said to be absorbed. No
known substance is an absolute absorber of light ; that is, an ab-
solute non-refiector. A flat or matte black surface comes the
nearest to being a total absorber of light, but it is not possible to
paint an object so black but what sufficient light will be reflected
from it to reveal its details when brilliantly illuminated. Thus
we see that what we call blackness is not caused by no light
reaching the eye but when very little does. The blackest object

THE NATURE OF LIGHT

looks gray in comparison to what is called Chevreul's black,
which is the darkne&s of the mouth of a dark cavern or a hole in
a large box lined with black velvet.

If the object reflects only red all the other colors are absorbed ;
if only yellow is reflected, then all others are absorbed. Again,
if wc use, as our incident light, any particular color of hght

.-^

Fig. i-

ntim Ilftit Blrikn a unooth reflecting lurfftce atich as a rutrrnr
or a fioal of ■till watrr it ii reflKted luck st tbe Bame angle at
whirfa tt sirikes or in more fdentific term* the angfe of refleciion
V. C. B in figure S ta equal to tbe angle of tncidrnee A, C, If.
be«k aaglcs being neaiared from a line perpendicular to the reflect-
ing aurface at Ibe paint where the reflection takes place. Theae
two anglea alvajra lie in tlie Ume plan* with the p«rpcndicalar
Ifa* wlUdi b always at right anglea to th« reAectiog luriac*.

which happens to be wholly absorbed by the object, that object
will appear black ; if, for example, we look at a yellow and a blue
flower by the yellow flame of a spirit lamp with common salt in
the wick, the yellow flower appears distinctly yellow, for it does
not absorb yellow light on reflection, but the blue flower looks
black, for it absorbs all the yellow light and reflects none of it.
We have briefly discussed four qualities of light. The entire

MOTION

PICTURE PHOTOGRAPHY

science of optics is embraced under these four sub-heads and
the better we understand these properties of light the more in-
telligently will we be able to know how to illuminate a scene and
what lenses to use, in order to obtain any photographic result
that we wish.

We have already found that light is propagated outwardly in
straight lines in every direction from a luminous object. When
it strikes a smooth reflecting surface, siich as a mirror or a poo!
of still water, it is reflected back from tlie reflecting surface at
the same angle at which it strikes, or in more scientific terms, the
angle of reflection is equal to the angle of incidence, as shown in
Figure 8. As we have become accustomed to visualizing objects
as being in a straiglit line before us, since light always travels
in straight lines, when we look into a mirror we do not see the

«.NV

Tig. g

Seflectioii of lifht from ad irregular itiffaee.

mirror itself hut the image which it reflects and the reflected
image appears to be behind or beyond the mirror, since our habit
of sight perceives the reflected object in that direction. If, how-
ever, the rays of light fall upon an object which is not perfectly
smooth, each tiny particle which coinposcs its surface presents
a diflfercnt angle to the light rays than its neighbor, so that the
light will be reflected at a different angle from each of these par-
ticles. This light reflected from the rough surface has thus had
its direction broken so that it travels in many different directions.
This is shown in exaggerated form in Figure No. 9,

THE NATURE OF LIGHT

Such light is called a ditTuscd lights thus, on a cloudy or hazy
day, the light o( the sun is diffused by its many reflections and
re-refiections from tlie particles of watery vapor in the atmos-
phere. On a clear day the direct rays of the sun cast a dark
shadow when any object is interposed between the sun and any
surface upon which its rays fall, but when the light is diffused
the reflected rays from many directions fall beneath the object,
since the object is not in line with these reflected rays, and il-
luminate the surface beneath the object and we are not able to
distinguish any perceptible shadows.

Practically all interior illumination is diffused light, for we
can only have direct illumination where the sun shines through
a window or other opening. We find it necessary to diffuse the
light in interior scenes in order to make them appear natural,
for it is not yet possible in the majority of cases to obtain suffi-
cient illumination in an actual interior to act upon a photographic
film with sufficient intensity in the short time of the exposure
necessary with the motion picture camera. We have to build
our interior sets in a studio leaving them open to the light at
the top, and generally upon two sides, thus allowing a flood of
light to enter. If the stage is an open platform, or if the studio
is not of ground or ribbed glass, which of itself diffuses the light.
it becomes necessary to suspend screens of thin white cloth
called diffusion or halation screens above the set, to break up
and diffuse the direct rays of the sun.

We can all recall witnessing, even very recently, interior scenes
taken in the direct sunlight where the pictures hung on the wall
cast long oblique shadows and the characters, as they went
through their actions on the screen, were each accompanied by
a funereal silhouette which mocked every gesture in grotesque
distortion upon the floor or wall. Happily, such scenes have now
passed into the limbo of fading memories. When artificial lights
are used, such as arc lamps, the light is diffused by ground or
ribbed glass screens or with tracing cloth or similar material.
The tubes of Cooper-Hewitt lights cover such an area that it is
not usually necessary to use a screen for them, for the light,
coming from so large an area covered by the tubes, is already
sufficiently diffused.

When we produced the spectrum by passing a ray of light
through a glass prism we found that the beam of light was bent

or turned to one side by the glass ; that is, the hght was refracted.
This refraction only takes place at the point of entrance between
two mediums of different density. After being refracted at the
surface the light continues to travel through the second medium
in a straight line from the point of entry to the point where it
emerges on the other side where a second refraction takes place,
light again continuing to travel in a straight line. This angle of
refraction varies according to the density of the medium in its
relation to light and is always the same in the same medium, thus
different kinds of glass and all transparent crystals and liquids
have different angles of refraction. This angle of refraction is

Fib- 10.

Illu»tt*tiiic Ibc rcUUonflhlp b«twMn letiMi «nd prisma. If w«

conaidcr s Itns >• conilitlng of innnmerablr im*!! priami built np

aroun<l * coBsnoa center this rduiotiihjp wUl become ippueal.

called the index of refraction. These indexes of refraction have
been measured by mathematicians who make calculations for
manufacturers of lens and predict all of its properties before one
has been made. Such calculations are, however, far beyond the
scope or needs of any ordinary photographer.

In Figure No, lo, we have a point from which emanates rays
of light. Suppose we take a number of prisms with varying
angles as illustrated in the diagram, the angle of each being such
that each ray which passes through each prism is refracted to
the point so that each of these rays is again collected at this point.
Let us now examine the line of prisms which we have thus placed.
The central prisms have sides which are nearly parallel, which
progress outward from the center, the angle increases until the
two faces come together. We will now replace the line of prisms

THE NATURE OF LIGHT

with a lens coTcring practically the same range as the prisms as
in Figure No. ii. We find that the lens also gathers all of
the rays as the prisms did and refracts them again to the same
point so that we can consider the lens as a number of prisms
rounded off into a single piece, or speatcing still more exactly.

Fig. 11.

TUa !■ tke Mm* «• Figure 10 with tbc proper carved lurficei cnb-
■tidtlcd for tbi ■ngulw inrfkce of th« joined group of pritm*.

,**"

Fig. If.

If w* tahc iwo loBiInetH points, A tnd B. we find tbit the lent
win forra Iiiugv* of thcM two point* u » ant) U The point A
being on the principal uii of the lent iU iimge will be formed at
k, alto on fbe princtp«l axis any motion of B «rllt cauie a
diametrically opposite motion in b.

that the lens is a continuation of an infinite number of prisms,
the flat surfaces of which are too small for the eye to detect. This
mfinite number of surfaces, or points, we find ranges itself into
the segment of a circle. This refraction of rays emanating from
a point back to a point again is termed a "point of focus."
If we now take two luminous points at the same distance from

MOTION

PICTURE PHOTOGRAPHY

ilie lens but separated a short distance from one another, as in
Figure No. 12 wc will find if we liave a screen for the rays to
fall upon, that the two points will be reproduced side by side in
exact miniature on the screen, but that the point of illumination
which is above the original point of illumination is reproduced
below the point of the original point of focus of the first point.
If we now move this screen closer to or farther away from the
lens, we find that the point of Hi^ht enlarges in a circle of illumm-
alion. This is termed the circle of confusion. By moving the
screen back and forth we also find that there is only one position
in which the points of illumination are perfectly reproduced. If,
however, we now move one of these points of illumination to a
much greater distance than the other, we find that while one is
sharp and distinct the other forms a small circle of confusion
and tliat when we move the screen so that the more distant one
is in focus, that the other becomes a circle of confusion, or out of
focus, as it is termed. If, however, we move the two points
closer to one another, but still at different distances from the
lens, we find that we can bring them both to a focus on tlic screen
or rather, so nearly to a focus that the eye is not able to dis-
tinguish the diflerence in sharpness between the two. This
diflFerence of distance between the two points of illumination is
called the depth of focus.

Let us now lake the points of illumination, as in Fig. 13, with
one of the points focused sharply. If now we inlcrpa.-w a piece
of black cardboard, in which a small round hole has been cut,
close to the lens so that this hole is near the center of the lens,
we find that the brightness of ilie images is much decreased but
that the image of the point which was out of focus is now much
sharper. Let us refer again to our Fig. 13. Our images are not
nearly so brilliant because much of the light which formerly
came ihrougli the lens has been cut oft by the piece of black card-
board; but as the cardboard has narrowed down the angle which
the light ray takes from the lens to the focal plane, we have nar-
rowed down, or made smaller, our circle of confusion.

Up to this point we have only considered light as it emanates
from a point, but now we are ready to consider any object which
may be reproduced by a lens as an image. In photography, prac-
tically all iinagcs that we have to consider are delineated or
lurmed in one plane ; (liat is, either upon Uic Hat surface of a

THE NATURE OF LIGHT

photographic plate or upon a film stretched flat or upon a piece
of photographic paper, as in a photograph, or upon a screen in
a moving picture theater, so that no matter by what means we

^^^

-==.J_«:

Let 9» take tfae points A and B In tlicac li*o dliKmnL In both the
upl>er uid lower diajrnun> the imaae of A will fonn, lo Hit plane ft
and itial of P will rurm in tl)c plane b, It it in Iheic two pluiea
that the acnaitive surfaces ihould lie to render ahatply the inugca
of A or B ai the caae mar ^t.

W« detiire tu receive botb of these images bowerer on (he platr at
oDcc and utilite iho two following mean* for obtaining the mult.
Ftral we comprotnue Ixtwcen the two planes a and b and place
our plate in the plane "C." We do tbia becaux tlie circle of coa-
fuaion at C. is common lo botb and is the amalleit mean between
ibe plane* • and h. Tliis cotnpraniise prepam us for belter
rcralti in onr 9d procedure. This consibta of placing
I diaphrocm clow to the lens. This iliaphrasin is a piece of
Uick cardboard with a unaoth, round hole in it and Its function
is to dxrainlsb Ibe antcle on the rays of light tliat rcpreacnl the
txirrmei of the cones of light which form the imases a and b.
Tbi« bus the desired eSect of reducing the tiie of the circles of
coofusloo at C to on inappreciable site. This siie depends on the
distance between A and B and on the stae of the hole in the
diiphntfm, A circle not greater than l/IOO inch is permisaible in
stills but for the cinema Mm one of 1/400 inch !■ about The limit
of site.

produce a photographic image it is practically always done upon
a flat surface. Let us tor llic purpose of our analysis, consider
any object or any image as being composed of a collection of a

THE NATURE OF LIGHT

of various deifrees of magnification. When photographs are
taken of heavenly bodies the eye-pieces are removed and the
photographic plate inserted in the tube of the telescope at the
proper focal distance.

In our experiments with the prism, wc learned that the glass of
the prism had not only the power of refracting or bending the
light, but also of dispersing or separating it into its component
colors, and in our previous ex]>eriments with a single lens we will
have noticed, if we have observed closely, that the images which
we produced were fringed with prismatic color. In diagram i8

Fit. 19.
CWnetien of diipenioa bjr ten* elcmctiti of different kinds of glu*

we see the reason for this, the blue and violet rays being refracted
to a greater extent than those of the other end of the spectrum.

Very happily for photographic purposes, the light refracting
power and the dispersive power of different kinds of glass are
very different and not interdependent so tliat wc are able to pro-
duce by cementing together, as in Fig. 19, or sometimes only
mounting together in a metallic mount, lenses from certain com-
binations uf different kinds of glass in which one kind counteracts
the dispersive power of another kind and thus the different colors
arc brought to a focus at the same point. It would be very incon-
venient to make a mathematical calculation and a very fine read-
justment of a ground glass from the visual focus to the actinic
focus of a lens every time we wished to take a photograph.
This correction for visual and actinic focus is thus very impor-

MOTION

PICTURE

PHOTOGRAPHV

Utit aod ts one of the prindpol reasons an ordinary magnifying
lens is not suitabte for making photographs.

It is mn unfortunate fact that there are on the market today
some makes of cirtematographic lenses which are not fully
collected for tiabI and actinic focos. The writer was at one
time oompcfied thnwigli force of necessity, to use such a lens,
and il was only after making many tests to obtain a focusing
sole or by focasog 1900 an object at a certain ratio of distance
oearer the Ioh* that he was able to produce pictures of satis-
factory dnrpoess with it. As it is never necessary to change the
focal distasoe from infinity in astronomical photography, no at-
tempt is nadc to correct telescopic objectives since, when actinic
focus is oacc ohtatnrrf. it is ntvcT necessary to change it.

The lens is the agent by which the light is directed to the
right spot in forming the image dependii^ upon the refraction
of UgfaL But before taking up the consideration of this impor-
tant piece of apfaratns for photographic work it will be necessary
to eTphin what we mean by the "Optics of Photography" as
iBhtiuguiAed fratn the optics of other sciences, such as those of
f tfK tchncupc and the miutftuyc.

The daef dwtinflioos are of two kinds: ist. in photographic
optics, the lens most be capable of transmitting and bringing
to a foms in the same plane oblique and axial rays of light.
as shown in Fig. aoi

The princTpal lens or objectirc of the telescope will not give a
shtfp image of an object if rcmored a slight degree from the
axis or perfect squareness of positkm in relation to the line of
Sg^ Hence, the sharpness of the image produced by the
uhjcttiie of the teiejcopc is confined to a smalt area close to the
uds. The pbotographk lens, on the other hand, must be so
coBStrocted that it wtJ\ gi%-e a sharp image of objects in front
of the center of the lens and also of those that are situated to a
certain extent on eadh side of the center.

3d. The photographsc lens must also be so constructed that it
wiU bring to a {ocas at the same spot the chemical and visual
rays of ^ht. If not corrected, the lens will act as a prism and
separate the fight into its component parts and produce the
spectral or nuflVm fringe around the edges of the image.

The violet or actirc end of the spectrum is brought to a focus
dose to the lens and the red at the greatest distance. The

4«

THE NATURE OF LIGHT

ydlow, which is brightest visually, is also further from the lens
than the active violet. In focusing visually* the plane of the
yellow would be sharp, but in photographing the sensitive sur-
face would have to occupy the plane of the violet, The result
would be that the image of the object focused by the eye would
be a blur in the photograph. The photographic lens must be so
constructed that the image of the object will appear sharp and
clearly defined to the eye, and be equally sharp as a result of the

.^-'

A rroH MctiAn of ft ph»(ocraphic objrclivc, one of flic combEn«l!flnt
coDtiatint of unccnmlcd clement* ftnd ihe other at cemented Ictmi.

chemical rays, when it is developed upon the photographic plate.
Such a coincidence of the chemical and visual rays does not exist
in the telescope or the microscope, but only in the photographic
lens. In the telescope and the microscope, which arc constructed
for visual work, it is not necessary.

To sum up these remarks it can be stated briefly that photo-
graphic lenses transmit oblique as well as axial rays and bring
them to a focus in the same plane ; and also bring the chemical
and visual rays of light to a focus at the same spot.

This brings us to the consideration of the photographic lens
and the principles which underlie its construction. By a lens is
understood a piece of clear glass bounded by polished curved
surfaces. The various forms of single lenses are divided into
two general classes:

AfOTION PICTURE PHOTOGRAPHY

i 1st. Double Convex.

Positive or Converging < 2nd. Piano Convex.

( 3rd. Convexo-Concave.

f 1st Double Concave.

Negative or Diverging < 2nd. Piano Concave.

[ 3rd. Co ncavo- Convex.

The first are thickest in the center, while the second are
thinnest in the center.

r-'ig. 11,

A, 0, C, (■dmUvc or converging IcnKs. D, E. F, ncBltirr or

divergiiit l«oic*. A. double convex; B, plvio<oiivex: C, convcxo-

coocsve or menliciu; D, doufair concave; E^ pUofHioDove; F,

concava-coovex.

These simple forms may be made np of one single piece of
glass or Ihcy may be composed of several cemented together, as
will be seen later. Diagram 21, illustrates these forms of lenses.

All lenses, whether considered singly or in combination, have
the following properties:

1. Principal axis.

2. Optical center.

3. Principal and conjugate foci.

4. Nodal points.

1st. Principal axis of a lens is a line passing through the
thickest part of positive lenses and thinnest part of negative

THE NATURE OF LIGHT

lenses, pCTpendicular to the surfaces of the lens, as in diagrams
No. 22 and No. 23.

ad. The optical center of a lens is the point from which focal
Dieasurements are made. This does not refer to a photographic
objective which (in other than single view lenses) is a combina-
tion of lenses and quite another matter for the reason tltat a
combination may have its optical center at a number of places
according to the circumstances under which it is employed. The

A>.

KtAti point w-itUn the luu.

positive optical center of a lens is determined by its form as
follow.s and shown in diagrams No. 22 and No. 23.

Draw two parallel radii AB and ab one from each center of
curvature, and both inclined to principal axis; then connect the
two points B and b at which they touch the curved surfaces of
lens. The point O, at which the line connecting B and b cuts the
principal axis, is the optical center. In most cases tlie optical
centre is within the lens itself but in some cases as with telephoto
combinations and single meniscus lenses it may be some distance
outside the lens. Such an example is shown in "Fig. 23.

3d. Conjugate foci. If a lens which has been carefully
focused upon a distant object be then directed toward one com-
paratively near at hand, the nearer object will be found to be

MOTION PICTURE PHOTOGRAPHY

out of focus, necessitating the withdrawal of the ground glass
from the lens before the image will assume its maximum sharp-
ness. This establishes the fact that there exists a relation be-
tween the object that is focused, as regards its distance from the
camera, and the focus of the lens. This relation is termed "con-
jugate foci." Foci is the plural of focus; conjugate means com-
bined in pairs ; kindred in meaning and origin. Conjugate foci
are then the distances from the lens to the image and from the

.'B

r.^;

Fig. ta.
Nadal point outside tbc lea*.

lens to the object. Hereafter wc will speak of the distance be-
tween the lens and the object as the anterior or major conjugate,
and that existing between the lens and the ground glass of the
camera, as the posterior or minor conjugate focus. Parallel rays
aa — that is, rays from a great distance — falling upon a lens come
to a focus at f ; but those from b, which may serve to represent
any object ten or twenty yards distant, have their focus at c
fFig. 24). Then fo is the solar focus, bo and co are conjugate
foci. The former of these is the anterior, and the latter the
posterior conjugate. To facilitate reference, the lines indicating
the conjugate foci are solid, while those relating to the solar focus

»0

THE NATURE OF LIGHT

are dotted. The points b and c are interchangeable; an object
placed at either is sharp at the otlier.

Rule for Conjugate Foci. Now for every position of the
object there is a certain position of the camera, and these two
distances, the distance of the object from the lens and of the
lens from the plate, are called conjugate foci.

Pig. Si.
Con juK»ic Toci.

A verj' simple mathematical rule connects the distance from
lens to object (D) the distance from lens to plate (d) and the
enlargement or reduction of the object (i.e., the nuniber of times
a given line in the object is larger or smaller in the image).
Note the word iine, because some prefer to calculate reduction

Fig. S5.
DotenninittoD of ConjuEatc foci.

and enlargement on the basis of area, which introduces different
conditions.

Let F be the focal length of the lens and r the ratios of en-
largement or reduction.

Then the distance d is equal to F plus F divided by r. Ex-
pressed more shortly ;

cM»«a cepic^ after tkc PrcncA De Bde. Ttc
of aay Model mt Ptafcuiona] camera.

1 L ■■■^■irli'/j ii/ n ir'jr; 4'j!:, p I- 1' i I'-' I ' ■'■, I.'

Thit camera it exieiuirely uied in nur Ktioul hrcauftc of the various
niodrrii devkr* cirtioflicl tlirrcin.

Chapter IV

THE MOTION PICTURE CAMERA

LONG before motion pictures were dreamed of, philosophers
and medical men were conscious of persistency of vision.
They knew from their experiences and the experiences of
others, if they looked at a bright object, such as the sun or a
lighted lamp and turned their eyes to a dark comer the image, or
at least a bright spot, would remain before their eyes for a few
moments. The brain retained the illumination that the eye had
sent to it for a few moments. Experiments proved that this
persistency of vision did not occur in the retina of the eye. Close
inspection of the retina showed that the picture projected thereon
by the lens of the eye vanished the instant the entering ray was
cut off. Therefore scientists stated definitely that the illusion was
centered in the brain. No further explanation has been made.

No human being or animal has ever been known to be without
this peculiar trait. No human being or animal has been known
to lose this persistency of vision. If a morl-al could be found
who did not possess it, when looking at moving pictures, he
would see not pictures in motion, but a number of "still" or inani-
mate pictures following one another very rapidly, each one per-
fectly still for about a sixteenth of a second.

Motion pictures are simply a number of snapshots run before
a strong illuminating light and projected, by means of a power-
ful lens, upon a white screen or surface. Each picture is ar-
ranged so that it will stop for a fraction of a second and then
move on, succeeded by another slightly different in appearance.
The brain retains the image of the first picture and when the
image of the second is telegraphed to it, by the sense of sight,
the two blend and overlap and the spectator imagines he has
seen but one image.

The camera in which the pictures are taken is similar to the
projecting apparatus but instead of the light rays being emitted
from the machine, as in the case of the projecting machine, they
are gathered in or admitted through the lens. The rays fall

MOTION PICTURE PHOTOGRAPHY

upon a long strip of sensitized Aim, the same as that used in smalt
hand cameras, made into a continuous roll which is fed past the
lens intermittently at the rate of sixteen exposures a second.
A rev<rfving shutter is used in both camera and projector to
cut off the light while the film is moving and a new section is
being drawn into position before the lens.

yTT \ t;t'tvt~wt.<ti.vt^,

K^\\\SS\\\\S\\V\S\\SI

r//////////////////////j/////////////////////////^.

Diacram of (lie mccIianUni of the L'DivcT»»l Cacnert. A aincle

•prock«t camera with lurmonic cun taovcmcnL

The motion picture camera is similar to the ordinary camera
with the exception that it is provided with a mechanism for
making exposures in rapid succession on a ribbon of film. Six-
teen pictures per second has been adopted as the standard speed
for taking and projecting motion pictures. Tliis rate was adopted
after a long series of experiments to ascertain the least number

THE MOTION PICTURE CAMERA

of pictures necessary to produce upon the screen a moving pic-
ture which would not offend the eye by the flicker or pulsation
due to the intermittent succession of iight and darkness which
produces the illusion of motion.

If the number of pictures thrown upon the screen is less than
sixteen per second, the persistency of vision is not sufficient to
carry the impression of light over the intervening period of dark-
ness. Although the eye may not be able to distinguish that the
light is completely cut off while the next succeeding picture is
being drawn into place, there is an unpleasant pulsation com-
monly called "flicker," which is very fatiguing and annoying.
By increasing the number of alternate dark and light periods per
second the persistency of vision is able to bridge the gap between
the successive periods of light thrown on the screen. As the
Hashes increase in their rapidity, they gradnally merge into a
sensation of continuous liglit upon the screen without perceptible
pulsation or flicker.

At sixteen pictures per second flicker is very perceptible so
tl»at many of the first cameras made were constrxictcd to take
many more than sixteen pictures per second. Some of them
made as many as sixty-four exposures and used a film four times
the area of the present standard. With the small returns obtain-
able from the exhibition of motion picture films in those days,
this rendered the expense of taking motion pictures almost pro-
hibitive. The present narrow width of film was adopted to cut
down expense.

It was also found that it was not necessary to take so many
pictures to produce a satisfactory illusion of motion. However,
flicker is unpleasant when the number of light flashes is less than
thirty per second. Sixteen pictures per second produce a satis-
factory illusion of motion so instead of taking and projecting
thirty or more pictures per second, a second blade or flicker blade
was placed upon ihe shutter of the projection machine. This
intercepted the light for an instant while the individual pictures
stood still upon the screen so that there were two flashes of
light for each picture.

Any camera mechanism which records the successive pictures
upon the sensitive film is satisfactory — there is no need of a
flicker blade except to make a perfect record for reproduction.

It is highly desirable that the pictures be accurately spaced at

MOTION PICTURE PHOTOGRAPHY

the standardized distance of three-quarters of an inch apart or
sixteen pictures per foot. Each successive picture when thrown
upon the screen will be as nearly as possible in perfect register,
tliat is in exactly the sarae place upon the screen. If this is not
done an unpleasant jumpiness or wavering of the picture will
result

In recording, that is in photographing, a motion picture at the
rate of sixteen per second, there are several operations in making
each frame or picture which must be accomplished in one-
sixteenth part of a second. It is not possible to utilize all of
this sixteenth part of a second in making tlie exposure because
the film must be drawn down into position for a succeeding ex-
posure before the next sixteenth part of a second. During this
very short period of time it is necessary to cut off the light from
the lens by means of the shutter, draw the film down accurately
just three-fourths of an inch, hold it in place, and expose it to
the image from the lens long enough to impress that image upon
the sensitive surface, then completely cover the film exposed
in the frame aperture before repeating this cycle of operations.
Ail must take place in the sixteenth part of a second.

It will be appreciated that a mechanism which fulfills these
conditions must be accurately and substantially constructed and
be able to perform this cycle of operations many thousands of
times without appreciable wear. It is possible to construct an
intermittent mechanism which will draw the film down so rapidly
that only a fifth or sixth part of this sixteenth of a second is
used in changing the film, but such a mechanism wears out many
times more rapidly than one which takes a longer time to pull
the film down for the next exposure.

In constructing a camera, therefore, it has been the generally
accepted practice to use an intermittent mechanism, comparatively
slow in moving the film and to make up for its slowness by in-
creasing the ''rapidity" or "speed" of the film. Although these
words are not correct, they are often used to indicate the sensi-
tiveness of the photographic emulsion. Sensitiveness of the film
is its ability to record the lens image in a given time.

There are many types of camera movement, but the best of
those is probably the harmonic cam. This is often called the
Lumiere, or the Lumierc-Carpcntier movement, as it was first
used in a camera of that name. The harmonic cam is a trian-

fit

REAR VIEW OF THE WII.ART PROFESSIONAL
MODEL CAMERA.

iriiala bji V. .¥. Sifrtel Cofft Sflfvol of Plicloffral'ir)

Wilart PrnfciMonal Cinicra mountrd on a Motion Picture Ap[i«»lus
Cnintianf's I'rcciaion Ballbcjring Tripod.

THE

MOTION

PICTURE CAMERA

gular cam with curved sides, working between two guides which
it moves up and down as it revolves. As it accomplishes the
downward movement of the fingers in a third of a revolution it
permits of a larger shutter opening than any other movement in
general use.

The Geneva, or Maltese Cross movement has been used in
camera construction, and while it gives a quicker downward
pull of the film than the harmonic cam. it has several dis-
advantages which preclude its ase. In Jhe Geneva movement
the downward draw of the film is accomplished in about an cightli
of a revolution, but, as this movement has four bearing surfaces
which are liable to wear unevenly it loas not found much favor as
a camera movement. Should one side, for instance, wear a trifle
more than the other three sides, every fourth picture in the
negative would be slightly out of register with the other three.
In addition to this, slight variations in the thickness of the nega-
tive film, or its pliability, cause it to ride the intermittent sprocket
more or less snugly, causing a variation in the frame line, or an
up and down movement of the picture.

The harmonic cam. on the other hand, revolves once for each
frame taken. Any small amount of wear, being the same for
each successive picture, is not appreciable. This wear may be
readily taken up in most constructions by loosening two screws
which hold one of the guides between which the cam runs, and
the guides may be adjusted firmly against the cam. The shutter
opening with the Lumierc movement may be greater than 180
degrees, which is much more than any other movement in com-
mon use. The shutter blade could be reduced to 120 degrees
were it not for the fact that it must have an additional width
sufficient to cover the aperture opening, so that the smallest
shutter blade that can be used in any movement is that fraction
of a revolution during which the film moves downward plus a
segment wide enough to completely cover the aperture opening
from comer to corner. The Pathe, Prevost, the Universal, the
Gillon. and many other makes of cameras, use the harmonic cam.
^H Almost all other movements arc some variation of the rod
^^ and crank principle. That is, a rod, or other connection, fitted
I to a crank pin on the shutter shaft actuates the up and down

I movement of the claws. Since the downward movement of the

I crank is one-half of a revolution, no rod and crank motion can

MOTION PICTURE PHOTOGRAPHY

have as wide a shutter opening as the harmonic cam. Some of
thcni decrease the time in which the film is moved down by having
a crank whose throw is greater than the distance from picture
to picture, and use only a portion of the crank throw for draw-
ing the tilm down, the engagement of the pins or claws with the
film taking place after the crank has commenced to move down-
ward and releasing before the crank readies the bottom of its
throw.

Tlicrc are many variations of the rod and crank movement.
In the Pittman model the fingers are upon brings actuated by a
crank. The fingers move in a circular path except when drawing
down the film, where Uiey are forced to subtend a chord of the
circle by a friction plate in the plane through which the film
moves. This friction plate being struck j6 times per second by
the revolving spring claws makes this movement a very noisy
one. In the Williamson movement a small arc-shaped slot guides
the pins in an appro.ximately straight line during the period of
their engagement with the film. In other movements a double
crank is used, giving both the in and out and up and down roove-
menl to the claws. A third variety of movement which was
much useil a few yeara ago was called the slip daw movement.
In tltis movement the claws were ratchet -shaped and in their
npvard travel slipped along the perforatkn as a pawl slips over
a ratchet.

The I^he Freres ff^meriy made an amateur modd which oscd
the sitp daw movement. The sUp daw roovemem has almost en-
tirely gone oat of use because it could not be reversed. No nat-
ter in which direction the crank of the camera was turned the
sl^» dkws wootd poll the fifan down in the same directkn. Aa
iB>iilMiHi< thravtos bad; of the crank, for cren a fractioo of a
levcilutiou, would caixse the film to k>se ks upper kx)p. Unless
there was a peat nicety of adjustment between the frictiaii at
the gate and the pressure of the spring daws ihej were fiabfe to
pddi Che fim laickward on their npward travel, cxaaa^ the
frames to overlap^ thucbjr T^''**ig what is caTied a ciup ni the
fin.

The m aad oat awutat, or the iiai < of the paa m aad

Qvt oi the peifcwait^M^ is accowpoweo m vanoBS ciMffis wf
■sairr dMiutH ■!■ ihiiili A poa^ve in and out movcoKal fe
^^■9 to be pRlored (Kcr one whidi v scoGBffiVBd ny mbb

THE MOTION PICTURE CAMERA

sort of spring pressure. A positive in and out movement is one
ia which the pins are pressed in and witlidrawn by a mechanical
movement, such as a cam or drunken screw. In the Pathe or
Gillon types the in and out movement is accomplished by a
drunken screw. A drunken screw is a thread having an ir-
regular pitch, the thread used for the in and out movement
being a continuous one with the contours so placed as to force
Ihe pins into the perforations at the beginning of the downward
throw of the cam and withdraw them at the bottom of the throw.
In the PVcvost movement the in and out throw of the pins is
accomplished by small hannonic cams of the same design as the
larger cam which produces the up and down movement. Most
of the rod and crank types of movement have a cam working
against a spring to push the fingers in and out, the cam pressing
the fingers in and the spring pushing them out when released by
the cam. It is possible to operate a movement of this type so
fast that tlie spring docs not have an opportunity to withdraw
the fingers quickly enough, thereby causing creeping and losing
of the loop. The Emcmann camera has a rod and crank move-
ment with cam and spring for the in and out finger movement.

There are many types of movement beside those mentioned,
none of which, however, are enough in general use to justify
discussion here. In purchasing a camera, therefore, make sure
that the movement is some modification of the harmonic cam
with a positive in and out movement of the claws. A second
choice is one of the better types of rod and crank movement.
The DeBrie camera is one of the highest tyjje of rod and crank
movement.

As nearly all parts of a camera movement shift backward and
forward l6 limes per second they are subjected to a great deal
of wear. All of these parts subject to wear must, of course,
be kept constantly but lightly lubricated, and should be provided
with means for adjustment so that there is the least possible
amount of play between bearing surfaces. The finger shuttle,
that is a frame bearing the fingers, which moves up and down,
is carried in some sort of guides which should be provided with
adjustable gibs for taking up wear.

The shutter is the revolving blade which cuts oflF the light
from the lens while the film is being moved downward for the
next picture, or exposure. The circular revolving shutter is so

0»

MOTION

PICTURE PHOTOGRAPHY

universally used in motion picture cameras that it is almost un-
necessary to take any other type into consideration. The shutter
shou!d consist of two blades, one of which is set immovably with
a minimum area for keeping the aperture closed during the down-
ward movement of the film. Another blade should be provided
which may be adjusted so as to decrease the opening in the shut-
ter by revolving it past the fixed blade, so that the opening may
be entirely dosed if necessary. While it is preferable to use
the maximum opening of the shutter in most instances, there are
many times when it is desirable, for various reasons, to cut down
the exposure by means of the shutter opening instead of a smaller
diaphragm opening.

A means for decreasing the shutter opening while the camera
is in operation is called a shutter dissolve. By its employment
are obtained such eflfects as fade-outs, fade-ins, dissolves, etc
There are two types of shutter dissolve, the automatic and the
hand operated. In the automatic dissolve the pressure of a
button on the camera throws a clutch into operation that closes
the movable shutter blade gradually in a predetermined number
of feet of film. With the hand operated dissolve the shutter may
be closed gradually by hand in any length of film desired. Gen-
erally neither one of these features is provided by camera manu-
facturers, one of the few exceptions being the Bell & Howell
camera, which has an automatic dissolve incorporated in the
camera mechanism. So desirable is this form of dissolve that
most professional cameramen have had them installed in their
cameras by some mechanic who makes a specialty of cinematog-
raphic machinery. It is to be expected that most manufacturers
will meet the demand for this device in their later models of
cameras.

One of the hardest problems for the student motion picture
photographer is the choice of a camera. The popularity of motion
pictures has caused many inventors and promoters to place minia-
ture or toy motion picture outfits on the market. While such
cameras and projectors may have a field of their own among
amateurs who have no serious intention of becoming professiotial
motion picture photographers, they are of little use for any
other purpose.

The reason for their existence is the decreased cost in their
operation, by reason of the very small film which they use. This

THE MOTION PICTURE CAMERA

puts them within the reach of those who could not otherwise
afford the expense of private production. In some cases, they
may be a boon to a student with professional aspirations whose
financial position will not permit the purchase of apparatus using
standard film. In general, however, the use of toy or miniature
picture apparatus by those for whom the contents of this book
are intended, is strongly deprecated. In the first place, cheap
cameras using standard film may be purchased for the same price
as a good miniature camera. In the second place, there is always
a chance that the owner or user of a standard camera may be
able to dispose of his production in some commercial way. On
the other hand, there is no chance for the operator of the minia-
ture camera to obtain any financial return of the expenditure
which be has made.

By judicious forethought, the owner of a standard camera
may conduct his experiments with very short lengths of film,
using only a foot or two at a time. The cost of material need
not influence even those whose financial restrictions arc most
stringent.

It must be tmderstood that the purchase of a cheap camera
for serious work is not recommended. By all means, purchase
the highest grade of camera that your means will allow. Gen-
erally speaking, the price of a camera is in fairly direct propor-
tion to the quality of work which it will produce. A cheap
camera produces poor work because the manufacturer cannot
afford to put accurate workmanship into it. On the other hand,
some of the better makes of the cheaper cameras will produce
pictures for certain purposes, which arc almost, if not quite, as
satisfactory as those made by a much higher priced instrument.
It would be ridiculous for a man who expected to use his camera
only for taking a few topical events for exhibition in a local
theatre to buy an expensive studio outfit with an equipment of
lenses, diaphragms, hoods and dissolves, when a cheaper camera
would do perfectly well for his purpose.

So many different types and brands of cameras have been
placed on the market that it is not possible to give a description
of all of them here, but most of the principal tj-pes are shown in
the illustrations and the reader must depend upon his judgment
in selecting the type of instrument best adapted to his re-
quirements.

MOTION PICTURE PHOTOGRAPHY

The ease or difficulty with which the film may be threaded
through the camera has an important bearing upon its usefulness.
As a rule, a camera of a straight line threading, that is one in
which there are no twists in tiie fiim in its passage through the
camera, is the simplest and most desirable. On the other hand,
the more compact models, in which the retorts are placed side
by side, cannot be threaded without a twist in the film.

The general rule for threading the camera is as follows:

Place the feed retort in position.

Pull out as much film as is needed to thread the camera.

Pass the film over the feed sprocket and open the gate.

Place the film smoothly between the side guides with the
emu1si<Hi towards the lens.

Close the gate carefully and latch, leaving a loop of film be-
tween the feed sprocket and the upper portion of the gate large
enough so that pulling the film down in the gate for six perfora-
tions will not draw the loop taut between the sprocket and the
top of the gate, and yet not so large that the loop will strike any
portion of the camera mechanism.

Then leave another similar loop at the bottom of the gate.

Carry the film around the take-up sprocket beneath the rollers
through the light trap in the retort to the spool in the take-up
sprocket and the take-up spool.

Fasten the cover of the take-up magazine.

Give the handle a turn to see that the film is feeding through
properly and close the camera.

The film in the feed retort must be wound so that when the
retort is in i)lace the film is threaded properly, the emulsion side
of the film in the gate toward the lens. In straight line thread-
ing the loop is not a true loop but only a slackness in the film
to provide for a quick downward movement of that portion of
the film within the gate when it is dragged down by the claws.

In cameras with the magazines side by side a true, or return,
loop must be made in the film between the feed sprocket and the
gate and between the gate and the take-up sprocket. Types of
the double return loop threading are found in the DeBrie, Pathe
Portable and Newman S: Sinclair cameras.

The Prcvost, carrying its magazines side by side on top of the
camera, is an exception, the feed magazine being directly above
the feed sprocket and gate, feeds downward in a straight line

TTIE "LAWHrN" MOTION I'ltTL'RK CAMKH \, INVENTION OF S. McKEE
U\WHt'N. PRKSIDKNt OF NEW YORK INSTITTTE OF PHOTOGRAPHY

(An imprDvrravnt ostr Mr. Lawbun's furmer potent. Sec diagnm.)

THE MOTION PICTURE CAMERA

and simple loop into the ^te. From the bottom of the gate
it goes upward and to the right tn a long single loop, without a
twLsl, to the take-up sprocket, where it feeds directly into the
take-up retort. The return, or true, loop is the same sort of a
loop 35 would be formed by wrapping a piece of film in a spiral
direction about a round object, while the simple loop of straight
threadii^ is merely a slackness in the film without any other
twist or tarn.

In addition to the simple directions given here there are a
number of variations in different cameras which provide rollen
for guiding the film in various directions. For example, in the
old style Gillon a roller is provided which brings the film in a
straight line from the feed retort, from whence it passes over
another roller before passing to the feed sprocket ; the object of
the second roller being to engage the 61m around a greater port
of the circnmference o^ the feed sprocket, in which only two
leeth wooM engage the film around a greater arc of the tpTOcket't
cuGoauocooc

Chapter V

CINEMATOGRAPH LENSES

TECHNICAL terms used in photography are often puzzling
to tiie amateur, particularly those terms which relate to
the science of optics. The following glossary of optical
terms has been prepared to give general information as to the
descriptive words and phrases in ordinary use.

Equivalent focal length. Focal plane, is the plane in which a
far distant object is imaged by the lens. The line drawn per-
pendicularly through the center of tlic lens is its Optical Axis;
the point at which tlie Focal Platie intersects the Optical Axis.
the Focal Point of the lens.

The Focal Length of a lens is the value upon which depends
the size of the images produced by that lens. Its magnitude can
he determined only by comparing the size of a given object with
its image as formed by the lens. The distance of the object,
unless very great, must also be considered.

For far distant objects the size of the image is in direct pro-
portion to the focal length. A lens of 12-inch focal length will
produce an image of a distant steeple twice as large as the image
formed by a lens of 6-inch focal length.

Back Focus is the distance from the focal point to the rear
surface of the Icns^ In very thin leases, this back focus is equal
to the focal length. In lenses of considerable thickness and in
combinations of lenses, the back focus cannot be relied upon as
any indication of the value of the focal length. The focal length
of such a lens is equal to the focal length of a thin lens, which
gives an image equivalent in size to the one formed by the com-
bination lens, hence the term Equiz^alcnt Focal Length.

In using short focus cinematographic lenses it is important to
know both the back and the equivalent foci, since the construction
of some makes of motion picture cameras is such that the re-
volving shutter has not been placed close enough to the aperture
to admit a lens of very short back focus without interfering with
the shutter blades.

The installation of a 35 mm. lens often demands considerable
alteration in a cine camera, not only of the shutter, but of the
front board as well, since tlie lens flange ordinarily used with
lenses of longer focal length is apt to cut off the comers of the
picture.

On account of the exa^erated perspective, lenses of extremely
short focus are not recommended for use except where limited
space prevents the use of a lens of sufficient focal length to
give a normal perspective.

In the majority of photographic lenses the equivalent focal
length is greater than the back focus, an exception being found
in single meniscus Or single concavo-convex combinations, which
arc practically never used as cine lenses where the back focus is
the longer.

By measuring back from the focal point a distance equal to
the equivalent focal length, we find the position of the so-called
optical center of the lens, which is nearly always near the dia-
phragm.

Angle of view is the angle under which the diameter of the
circular area covered sharply by the lens appears from the center
of the lens. If the largest plate, which the lens covers sharply,
is used, the angle of view is equal to the angle under which the
diagonal of the plate appears from the center of the lens. The
angle of view increases with the increase of the focus of the
lens or the same size plate. Lenses for general purposes are
calculated for an angle of about 60*. Lenses covering 75® to
100° are termed Wide Angle Lenses. Wide angle lenses have
'necessarily shorter foci than other lenses rated for the same plate.

As a motion picture is customarily viewed at a distance
relatively greater than a still photo the angle of view averaging
nearest normal is about 28", using the base and not the diagonal
of the picture as a basis for calculation. This is the angle sub-
tended by a two-inch lens on the standard ^ by i inch aperture
or picture frame. Lenses of shorter focus than this are termed
wide angle, although the angle of view is still not so great as
that found in many still pictures which are taken with lenses
which would be far from being considered wide angle for an or-
dinary photograph.

The circular area which is covered by the lens on the ground
glass is called its image circle, and its diameter is expressed in
Uocar measure (inches or centimeters).

MOTION PICTURE PHOTOGRAPHy

the object is called "depth of focss^ or **dcpdi of Beld.** It de-
pends oa several factors, vtr: the focai length of the lens, the
apeiture used (cooseqnentiy its speed), ihc distance of the object,
and the ainrwuU or bck of ilmpiirss which seems pemiUsible
to the operator. Of titese factors, focal lensth, aperture and
distance are definite munerical vahics.

That the amoont of ™f*MJ"M'iiMii^^^ pennissible on the picture
is sosccpdble of mnncnca] expression is casxl)r seen from the
foOowtng: H an object at a given distanrr is in sharp focus, the

l-P^

vtAia vfckk aB electa are rcodend muMihfcf
Vraavd ^am. It ndcs Xrecdr a* Or /: valac
M Ac local k^dL

iannrfr

ligfat isstitnp from a point of that object is conterged to a point
on the plate, light issuii^ from a point in the original object
win also be conrerged to a point, but not on the plate, the cone
of l^ht showing in either case a circtilar patch of tight on the
plate. This circle of light is known as the "circle of confusion."
Its diameter can be used to express the amount of indistinctness
existing in a picture. If the circle of confusion is not greater
than i/io mm. or 1/250 inch, it n-ould appear as a point to an
eye 10 inches away, hence, an object no point of which is imaged
by a circle lar^rer than i/io tnm. would appear sharp.

No nsatter what their type of constnictioo may be. all lenses
of the same equivalent foci and the same relathre aperture require
the same exposure — that is^ have the same speed, other condi-
tions being equal. They will have the same depth also.

The depth of focus decreases: I. with increase of focal
length : 2. with increase of relative aperture (speed) ; 3. with
increasing nearness of object.

Of two lenses of equivalent foci, the one with the lower rela-
tive aperture (speed) has ibc greater depth of field. On the

CINEMATOGRAPH LEXSES

Other hand, if the focal length of the lens is rery- short, a speed
as high as F: 4.5 will allow bringing every object from 10 feet
to infinity to a sharp focus, while a studio lens of long focus and
the same speed may not even image an object of the depth 01
a head sharply within the range of the length of a studio.

Speed, great focal length and depth of focus cannot be com-
bined in the same lens. This is an unalterable law of optics. If
speed be the most desirable quality, depth of focus must be sac-
rificed ; if depth of focus, speed. This does not detract from the
value of fast lenses, because wirh a given lens the depth of focus
can be increased by diaphragming down the lens which means re-
duction of speed. If a short exposorc demands the use of the
lens wide open, one must nc< expect great depth of focus. Under
ordinary conditions of light and di<Janfr, with fair judgment, and
with lenses not too long in focns, these opposii^ qualities may be
happily combined, so that lade of depth is hardly perceptible.

Some apparent exceptions may be stated, for instance, a lens
which produces images of general "softness." tU., a lens in
which the abenatians are not corrected to the otmost perfec-
tion. Such lenses, which lack soap and brilliaDcy. may show
greater depth of focus than a first-dats lens. There is less
differeiKe between the ^'sharpest'* focns and the inage of objects
forward and bade of it. simply because the "sharpest* focus itsdf
is not really sharp. Thus the statement that one lens has a
greater (kpth of focns than odiers of the same aperttxre and
focus, most be regarded as rather detiimental to the lens, for as
stated above, depth of foctis cannot be made subject to special
correction.

Another cafe mav be mentsoned in which one lens may really
have an advantage over airthrr m regard to depth of focns.
In some camera coostmctsotts coiicOiop of astigmatism is ob-
tained at a great sacrifice of simplicity by employing an UDOsaal
number of lenses squiated by air spaces. There is a certain loos
of tight by reflectiOB on a lens snr^cc and it is easily jntcfSgWp
that the fewer rcBeaiug swCites in a lens, the saoBer tke losa
of light. In seme ooostrvctiaos the imiober of the leas wr faces
nms as htgfa as tea. vhile Ae Tessar oonlaiai oaiy mx. The
ooBsetpicace is that ffae IcBE wilii Ae grater annber ol
aufaas requiies a loagcr ejqioame tfaaa a leas of
stnxtiOD, althoqgb bocb may hare the ome rditivc apotBrc

MOTION PICTURE PHOTOGRAPHY

Or to express it differently : the lens with the greater number of
reflections requires an aperture of F:6.3 with a certain time of
exposure, while the other lens will give a negative of equal
density with its aperture stopped down to F 7.2 or F 7.5, which
mc^ns a gain in depth of focus for tlic lens with the smaller num-
ber of reflecting surfaces.

Cinematograph lenses are usually made with the smallest num-
ber of reflecting surfaces consistent with the requisite correction.
They are also sliglitly faster than lai^er lenses of equal aperture
Iwcause their small size makes the glass to be traversed by the
light much thirmer.

Spherical Aberration. Chving to the fact that lenses arc made
with spherical cu^^'es, all single collective lenses have the defect
of imaging an object through their marginal zone at a shorter
focus than through their central zone. Such a lens may
give a sharp image with a small central diaphragm, and a sharp
image as well if the center is covered with a round opaque
slop so that only an atmular zone around the margin comes into
action. But both images will not lie in the same plane, nor will
they be of the same size. Even if a lens is spherically corrected,
so that the parallel rays penetrating the lens near the optical axis
and those going through the lens near the margin come to exactly
the same focus, there may be a slight remnant of spherical aber-
ration in the zone between center and margin. Small remnants
of this kind (so-called Zonal Errors) are found in almost all
photographic lenses, especially of the cemented symmetrical type.
The unsymmetrical combination upon which the Tessar con-
struction is based, allows a better correction of the zonal errors
than any other known construction. The greater the relative
aperture (speed of the lens), the greater tlie task to correct the
spherical aberration for all zones of the lens.

Unsatisfactor>' spherical correction is indicated cither by a
general indistinctness of the image or by a fairly sharp image,
which is entirely covered by halo (fog). Stopping down the
aperture may improve the performance of a badly corrected ob-
jective.

Coma. The spherical aberration of pencils of light going
through the lens in oblique direction is called coma. This mani-
fests itself in the fact that although objects in the center of the
field appear perfectly defined, objects outside the center show a

CINEMATOGRAPH LENSES

one-sided indistinctness which increases toward the margin of the
field, and in the image of a point-shaped object assumes the form
of a tail Uke a comet, whcrcfrom this aberration takes its name.
Stopping down reduces the amount of coma.

Astigmatism is that aberration which withstood longest the
elTorts of the opticians. A lens which is not corrected for
astigmatism wil] not image sharply horizontal and vertical lines
at the same time near the margin of the plate, although the
center of the image may be perfect. This aberration is in-
herent in narrow pencils of light, so that stopping down the lens
will not decrease the amount of astigmatism to the same degree
that it decreases other uncorrected aberrations.

CURVATtTRE OF HELD

In the absence of a test chart a very simple test for astigmatism
may be made by focusing on the joints of a brick wall. No
matter how much the lens may be racked in or out. bo^h horizon-
tal and vertical lines will never be sliarply defined at the same
time near the margin of the plate,

CurzxUurf of field. The ordinary lens images a flat object,
not in a plane, but in a spheroidal surface, so that when the
center of the image is focused sharp, the ground glass lias to be
brought nearer to the lens to obtain a sharp image of an object
point near the margin of the plate.

It is only in recent years that it is possible to correct astigma-
tism, together with the curvature of field in lenses of high speed.
Lenses which are free from spherical aberration for a large

MOTION PICTURE PHOTOGRAPHY

aperture and produce a flat image free from astigmatism, are
called "Anastigmats," the prefix "an" meaning "without," hence,
without astigmatism.

Distortion is that fault of a lens which prevents the render-
ing of straight lines as such. The straight lines are repro-
duced as curves. All single lenses used with a diaphragm
in front (landscape lenses) are subject to this defect in some
degree The distortion is called "cushion-shaped," when the

PILLOW DISTORTION.

BAKREL DISTORTION.

curves are concave, and "barrel shaped," when the curves are
convex toward the margin of the plate.

Lenses which arc free from distortion are called rectilinear.

A lens which distorts cannot be improved by using smaller
stops.

Distortion has nothing to do with curvature of field. The
image can be properly flat and the definition perfect, and yet
straight lines may be distorted into curves.

Chromatic aberration is due to the fact that in a lens, unless
corrected from chromatic aberration, the visual rays which form

7»

CINEMATOGRAPH LENSES

the image seen on the ground glass do not {orm the innages at
the same position as the actinic or chemical rays, which affect
the sensitive plate. Since the image is focused with rays for
which the eye is most sensitive, the image formed by the rays
for which the plate is most sensitive will fall outside of the visual
focus (focal point), and therefore must be blurred on the plate.
Of course all photographic lenses which are of any value at all
must, first of all, be corrected for chromatic aberration. An
objective which has chromatic aberration is sometimes said to
have chemical focus.

CHROMATIC ABERRATION

IT— Focal pisne of Violet Rajri
R— Fonl plane of Red Rajt.

This is not an uncommon defect in cinematograph lenses, but
may easily be tested for by focusing upon coarse printed matter
with other placards at varying distances before and beyond the
one focused upon. If any of the placards film clearer than
the one focused upon it is plain proof that the visual and chemi-
cal foci do not coincide.

Definition is that quality which enables a lens to produce
sharp and crisp images, and its presence in an objective is
a proof of exact workmanship as well as careful computation.
The best workmanship will be wasted in a lens not well designed,
and bad workmanship will annihilate the best computer's skill.
If the various defects and aberrations are corrected and the work-
man has done everything to carry out the designer's ideas, the

MOTION PICTURE PHOTOGRAPHY

lens will give at full aperture a flat and sharply cut image over
the entire area covered. The area covered with perfection is
sometimes called area o( critical definition. Since most of the
aberrations depend u[)on the opening of the lens, the definition
may be improved in some cases by reducing the opening at the
sacrifice of speed.

Illumination. We speak of even illumination when the margin
of the plate receives as much light as the center, and the negative
shows an even density over its entire surface. A perfectly
even illumination is only possible with small stops, especially
when a larger plate than the lens is rated for, is used. All
speed lenses when used with full aperture, show more or less
drop in the illumination (vignetting) toward the margin of
the field covered.

This vignetting or cutting of oblique rays by the lens barrel is
apt to show quite plainly in pictures taken at large aperture with
extreme short focus cine lenses. To get a full exposure at the
edges may even require a slightly larger diaphragm opening than
is needed with a lens of longer focus where the vignetting effect
is imperceptible within the small area of the aperture plate.

Covering Power is expressed by the area which the evenly
illuminated flat field covers with perfect definition. It depends
upon the diameter of the lenses and on the degree to which the
diflferent aberrations are corrected and may, in some cases, be
increased by using smaller stops.

The greater the relative aperture and the greater the covering
power, tlie more valuable the lens.

Flare Spots. Occasionally a negative will show a nebulous
patch of light co%*cring shadows and high lights alike. Such
patches are called flare spots or ghosts. They are formed by
light reflected within the lens, at the lens surfaces bounding
air spaces. It ma\ be slated as a rule that every lens having an
air space will show a flare spot under some conditions. Al-
though it is possible to so adjust the curvature and direction of
the lens surfaces that the flare spot is spread over nearly the
whole plate (therefore not noticeable) this generally could be ac-
complished only by sacrificing more important corrections.

Before it can be said that one lens is superior to another with
respect to flare spot formation, the two lenses roust be thoroughly

CINEMATOGRAPH LENSES

tried out under a great variet)' of conditions of illumination.
Generally it will be found that if a lens shows a flare spot and
another of difiFerent construction does not, by changing condi-
tions, the second lens will show a flare spot and the first will not

Very small stops may show flare spots when larger stops do
not.

Flare spots arc most apt to appear when photographing an
object against a strong hght and least apt to appear when the
light is coming from back of the camera.

A condition resembling flare is apt to occur in a dirty lens par-
ticularly fron; almost imperceptible spots from oil spattered by
the camera mechanism or from finger prints. Moral : Examine
the lens frequently and keep it immaculately clean and well
protected.

Flare will occur with the best of lenses if strong extraneous
light is allowed to strike the lens. Moral number two: Use a
lens hood.

Chapter VI
FOCUSING THE CAMERA

THE first requisite for obtaining a sharply defined image on
cine film is focusing the lens accurately. The poorest
lens made will make a sharper image at its focus than the
best lens made which is out of focus.

Most cinema tographers are prone to focus each scene upon
the ground glass or upon the film for every difiFcrent set up of
the camera and many even focus between scenes in the same set
taken at the same distance. This is decidedly wrong and a grievous
waste of valuable time. Often the cameraman has used from five
to fifteen minutes of the entire producing company's valuable
time in obtaining an accurate focus.

This is not a criticism of the photographer who composes his
picture on the film aperture, although many also take an unneces-
sarily long time for that operation,

The fact of the matter is that no man can focus as accurately
every time as a well mounted lens can be calibrated for focus
and the cameraman who has not taken tlie time to accurately
scale his lens must be very inefficient in focusing. Many of them
do not seem to know that the focal distance of the lens is always
the same for any object at a given distance from the camera.
Others are content to work with a camera so ramshackle that
even if they were to calibrate their lens mount it would not
work the same two days in succession. A tape line measure-
ment from the front of the camera takes but a moment and with
the lens properly scaled on a solid mount the photographer is
always sure of a sharp focus.

The scale is almost indispensable to the topical operator whose
work must often be made on the jump. He can soon leam to
estimate with his eyes within a few inches or feet of the distance
of the principal figure that he is taking. A few feet away from
the camera the depth of focus is so great that it is easy to set
the lens quickly between fifteen or twenty feet and the infinity
mark and be absoluely sure of a sharp focus. He must have

FOCUSING THE CAMERA

very poor judgment indeed if he cannot estimate distances under
fifteen feet within a very few inches. The more careful studio
worker can always verify his judgment with the tape measure
and in many cases, by a proper arrangement of his focusing de-
vice, is able to change the focus as a figure advances toward or
retreats from the camera.

In this day of multitudinous effects of moving cameras on
trucks and wheels, sli<ie ways and moving cranes, it is essential
that the up-to-date worker be able to change the focus while
takHng pictures.

We shall soon have practical motor-driven cameras and gimbal
panoramas which may be turned in any direction without the use
of two panorama handles at once, as is now necessary to produce
a straight diagonal panorama. These are logical conclusions and
even today many of the effects must be produced by two and
even three or more working simultaneously with one camera.
Simplification of manipulation should be sought by the operator
who wishes to keep in the front rank.

Here are a few simple directions for scaling or calibrating a
Jens mount.

Before starting to scale the mount give your camera a thorough
looking over, making sure of the following points:

First — That the film in its travel past the aperture plate or
frame opening is always in flat contact with the opening; that
there is no possibility of tlie pressure plate sliding askew in its
seat on the gate and producing an uneven pressure against the
film: that the side guides are not so close together that they will,
by pressure against the edges of the film, cause it to belly or
buckle ; that the fingers, claws, or pins, that feed the film down
for each frame are in perfect alignment and do not wrinkle the
film by a diagonal downward pull, caused by the pin engaging and
dragging the film down by a pull on one side only ; that the gate
tension is always sufficient to hold the film against the frame
place securely but without needless friction.

It is well to mention here also that velvet lined tracks, pressure
plates and gates are not only an abomination when trying to
obtain accurate results in focusing, but are also great scratch and
static breeders and should be replaced wherever possible with
sosxie bard, non-corrosive metal polished to a glass siQOQthaess,

MOTION

PICTURE PHOTOGRAPHY

scale, complete your range of distances, rS inches, 2 feet, 3, 4, 5,
6, 8, 10, 12, 15, 20, 35 and infinity being a good range. Dis-
tances between these can be estimated easily as being proportion-
ately between the nearest known distances on the scale. For
objects closer than three feet, unless your scale is marked in
differences of a few inches, it is safer to use the ground glass; a&
the nearer the object the greater the change in the focat distance
of the lens.

If you have followed these directions closely you can with the
aid of your tape measure be sure of getting your pictures in
focus every shot.

Besides the purely mechanical errors that are liable to occtir
in focusing a cinematographic lens, there remain others to which
reference has not been made.

These come chiefly under two heads: First, the inherent
errors of the lens ; and second, errors in the method of focusing.

Cinematograph lenses are not apochomatic, that is,' corrected
for light of alt different wave lengths. If, however, they have
been corrected for visual and actinic focus this is of no par-
ticular importance as the ordinary brands of film are only sen-
sitive to the actinic blue and blue-violet rays.

Without entering too deeply into the physics of light rays and
their wave lengths, it is still important that we take into con-
sideration some of their better known properties and discuss them
with relation to the subject in hand.

We are all familiar with the brilliant band of prismatic colors
which results from passing a ray of white light through a prism.
The light waves may be compared to sound waves of different
pitch and there are many light waves which are invisible to the
human eye just as there are sound waves too low and too high
in pitch to be audible to the human ear. The red end of the
spectrum is the low pitch end, or long wave length end, and does
not affect ordinary photographic emulsions except by greatly
prolonged exposure. For this reason we illuminate dark rooms
with red lights, to which our eyes arc sensitive while the film is
not.

The actinic and visual rays are not two separate and distinct
kinds of light, but are terms which are used to designate two
different sections of the spectrum which overlap one another.

(Phc<tD l-y U. S. Signal CarfJ Sckoai of Phatoirapfiy)

Students nceirinii initmclion in the use of tbe Akelejr canim-
Thii inxcniou* inKrument can t»c CanncJ and tUtctl in any dlmtioci
t>jr rhr h«ndlr projrcting at the lock. It has a focal |itan« shiillrr
and numcrnuii other improvcmvnlit found in no othrr make of
cine caroera.

FOCUSING THE CAMERA

The visual rays are those which wc discern when we make the
spectrum with a prism as has been described — the actinic, how-
ever, begin in the region of bluish green and extend far into the
ultra violet, which though invisible to the eye, extend for a dis-
tance beyond the visible several times the length of the visible
spectrum.

If it were not for the fact that ordinary optical glass is prac-
tically opaque to these ultra violet rays, wc would be let in for
a tremendous lot of complications with invisible lights, which
could fog the film without visible knowledge on our part. Most
of us have a hard enough time to keep from fogging the film
as it is, without having to take precautions against an invisible
enemy, such as the X-ray photographer has to contend with.
The X-ray photographer or radiographer, as he prefers to be
called, has either to keep the photographic materials at a long
distance from his Crookes tubes or to wrap Uiem carefully in
sheet lead.

The invisible rays at each end of the spectrum are intensely
interesting subjects to study and the readers will do well in
their spare time to get some popular books on physics, and read
up the subject of light, where they will find fascinating facts
that have no room here.

By means of certain dye chemicals, it is possible to sensitize
ordinary emulsions so that they are sensitive not only to all the
visible colors but to the infra-red as well. Sir W. W. de Abney
has even photographed a kettle by the infra-red rays emanating
from boiling water contained therein. Radiant heat and infra-
red are practically synonymous and interchangeable terms.

Professor R. W. Wood, of Johns Hopkins University, one of
the most distinguished of American physicists, has attracted
much attention recently by ingeniously photographing the com-
mon objects about us. as well as the planets, by these invisible
rays. As has been stated, glass is opaque to ultra violet light but
quartz and rock crj-stal are as transparent to them as is glass to
ordinary light. Therefore to make photographs by ultra violet
light, it is necessary to use a filter or screen to keep out the
visible light just as one uses a yellow screen with orthochromatic
plates to screen off the blue rays to whidi these ^ates are also
sensitive.

MOTION

PICTURE PHOTOGRAPHY

Silver foil and bromine vapor confined in a rock crystal cell
arc opaque to visible rays, but transparent to ultra violet Pro-
fessor Wood also discovered that a black dye called nitroso-
dimcthyl aniline possesses this property.

For the infra-red or heat waves a glass lens will serve. Again
it is necessary to screen off the visible light, which can be done
with pitch or thin sheets of vulcanite. A number of these in-
teresting photographs by Professor Wood were published in the
Popular Science Monthly.

It may puzzle some readers to know why we distin^^uish
between visual and actinic rays if all the actinic rays with which
we are concerned are also visible. The reason is this : The blue
and violet rays which comprise the actinic rays produce the
strongest effect on a photographic emulsion and the weakest
effect of any of the visual rays on the retina. Therefore when
we focus on the ground glass we are adjusting the image by the
strongest visual or the yellow rays and we are unconsciously dis-
regarding the actinic or blue image, because it is overpowered
and quenched by the more visible yellow rays. Although it may
amount to considerable when the picture is magnified on the
screen, the difference is so slight that it requires a powerful
focusing glass and an extremely fine-grained ground glass to per-
ceive it with the eye. Suppose the aclinic and the visual focal
planes were 2/1000 of an inch apart, about the thickness of a
thin cigarette paper, by theoretical calculations it would appear
to produce a blurring more than an inch in width in any sharp
outline on the screen with a sixteen foot picture, considering the
lens to have been used at F 3.5. Actually, for several reasons
which have to do with the theory of development and light dis-
persion, it would be much more.

Ordinarily we would consider the edge of a cigarette paper
as defining a sharp line, and yet the visible color fringe in the
image on the ground glass for this same amount of error in
correction would be only six ten thousandths (6/10.000) of an
inch or less than one third (>5) as thick as the cigarette paper.

Suppose, on the other hand, that a lens is absolutely correct and
you are taking a scene which requires F 3.5 aperture and your
error in focusing is two one-lhousandths (2/1000) of an inch,
or less than one-third (>^) the thiclcness of the film, the amount
of blurring will be the same.

FOCUSING THE CAMERA

With the lens slopped down these errors are reduced propor-
tionately, but with a good lens, properly focused, you should
get just as sharp a picture of objects at tlie same distance at
F 3.5 as at F 16.

Do not misinterpret this statement to mean depth of focus.
It means that at F 3.5 and the lens focused at sixteen feet ( 16 ft.)
all objects in the range of the camera and sixteen feet (16 ft)
from it, should be just as sharp as those taken at F 16, but it
docs not mean that any object closer or farther away than
sixteen feet (16 ft.) with the lens set for that distance will be
as sharp at F 3.5 as at F 16.

Instead of using a ground glass or a piece of film for focusing,
get a piece of first quality lantern slide cover glass or better still,
get a piece of "optical flat" from the optician and cut it lo the
correct size to fit in the film rack at the frame aperture.

Get an optician to rule the glass in one-eighth to one-quarter
inch squares making the lines as thin and fine as possible, and
just deep enough to retain a spider-web line of fine black enamel
or lampblack when rubbed over the surface of the glass. If you
have a fine pointed glazier's diamond you can do this yourself.
When you have finished, the cross lines should look as if they
had been drawn with india ink and a ruling pen, but should be
many times finer than could possibly be made with a pen.

Now you must have a focusing glass of fairly high power,
preferably of the type known as a focusing loup, which is an
achromatic magnifying glass set in a short tube with a screw
thread for adjusting the focus. Place the ruled glass against the
lower end of the loup with the lines outward and with it turned
to the light, adjust the focus until the black lines are the sharpest.
Now place the ruled screen in the aperture plate with the lines
toward the lens and with the loup against the screen, focus the
lens. You will see the image just as in the opera glass or tele-
scope, except that it is upside down. When the image and the
lines are in focus at the same time and the lines look like bars
dividing the picture, your camera lens is in focus.

This is termed an aerial focus. As the human eye has a con-
siderable range of focal adjustment, or "accommodation," as it
IS called, and could possibly focus on the aerial image even if it
were not quite in the focal plane, the lines on the glass form

MOTION

PICTURE PHOTOGRAPHY

a correct fixation point for the ocular focus and prevent its stray-
ing ahead or behind the proper plane.

If the focusing glass which you use for this is an achromat
from a reputable maker and you can detect a prismatic fringe
about any of the objects on which you arc focusing, you may be
sure that your photographic objective (your cinematographic
lens) is not properly corrected. If so. return it to the maker.
Don't tr)' to take pictures with it.

A microscopic focusing tube with which a needle point sharp-
ness of focus may be obtained almost instantly is such a com-
paratively easy device for a cameraman to make, that it is re-
markable that more camera workers have not provided them-
selves with such an instrument.

Practically every cameraman carries a focusing glass or mag-
nifying loup of sfjme simple character, but one who has used a
focusing glass of medium high power will never again be satis-
fied with the rough approximation that is the best he can do with
the ground glass and an ordinary loup.

It is remarkable how many cameramen regard an aerial image
as something mysterious and beyond their comprehension. When
the camera is focused correctly the image exists at the focal plane.
i.e.j the frame opening, whether it be cast upon the film or
ground glass or whether they be absent altogether. In focusing
with the ordinary low power glass on the film or a piece of groimd
glass it is impossible, except by chance, to obtain a definition
which is finer than the structure of the film or the granular struc-
ture ""f the abraded or ground surface of the ground glass.

The ground glass or film is an almost indispensable part of
the cinema tographer's outfit, it is true. Its use, however, should
be for the composition of the picture and the placing of the side
lines rather than as a necessary part of a focusing device. We
cannot dispense with it if we have nothing more than ordinary
focusing glass to depend on for sharpness of definition. If we
attempt to view the aerial image with a low power glass, even
though it be mounted in a tube at the proper focal distance for
the eye, it cannot be relied upon unless a cross lined glass is
interposed in the focal plane.

The human eye is a wonderful instmment and is able by a
muscular contraction of its flexible lens to change the focal length

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FOCUSING THE CAMERA

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of the lens so that either near or distant objects may be brought
automatically to focus. This is termed the accommodation of
the eye; that is, the eye accommodates itself within certain limits
to more or less diverging rays of light. If we attempt to focus
on the aerial image at the aperture plate without providing a
cross line at the focal plane so as to focus the eye at the proper
distance we might find that the eye had accommodated itself to
an aerial image having a position before or behind the actual
focal plane. With the cross line in place, however, the image
must be in the same plane as the cross line or it will be out of
focus, so that when focus is obtained both the cross line and
the image are equally clear and the image will be bisected by
the cross line as in a surveyor's transit.

If, however, wc take a step forward and increase considerably
the power of the magnifying glass with which wc examine the
aerial image the slightest deviation of the image from the focal
plane throws the lens system of the microscope so badly out of
focus that it is much beyond the range of the eye's accommoda-
tion to bring it to a focus and wc arc thereby enabled to dispense
with the cross line if we wish, as wc have no further use for it.

It is imperative, however, in using a high power glass that
some rigid mounting be provided by which it may be made cer-
tain that the magnifying glass be set always at the correct focal
distance from the focal plane.

Resolved into its lowest principles a high power focusing de-
vice is a compound microscope mounted in a camera so that the
image produced by the camera lens may be considerably en-
larged. In the foregoing sentence the words "high power" are
used merely as a term to differentiate a compound microscope
from the magnification produced by a simple lens combination as
found in an ordinary focusing loup. In reality, such a micro-
scope is of very low power as compared to compound microscopes
used for bacteriological examination.

Probably the cheapest and quickest way to obtain such a glass
is to buy a student's ordinary compound microscope, which may
be had for prices as low as two dollars and fifty cents to five
dollars. Withdraw the tube containing the eye piece and ob-
jective and mount it directly in the camera.

If the construction of the camera prohibits the tube's being

MOTION

PICTURE

PHOTOGRAPHY

Especially fine specimens may be made by the cameraman
himself by following these directions, which are adopted from
methods descrilied in The British Journal of Photography.

Carborundum powder may be relied upon, if the finest and
purest quality is used, to produce a first-class focusing screen in
a very short time. With the exception of the powder, the only
thing wanted is a "rubber," which consists of a piece of glass fixed
with cement to a block of wood, which serves as a handle. In
use the glass or film to be ground is wetted, a little powder is
thrown upon it, and then the rubber is brought into play. Of
course, the surface of the rubber becomes ground as well as that
of the plate, and when it is in this condition it works at its best.
The time required depends on the size of the rubber. Using one
about 2 inches by i, a 4 x 5 screen can be completely and per-
fectly ground in five minutes or less. It is best to grind a large
piece and cut out the best sections for use.

A most useful application of the "rubber" is for grinding the
backs of lantern or stereo sh'des. The former are sometimes, and
the latter nearly always, all the better for being on ground glass,
yet transjjarcncy plates on ground glass are not always available.
A second cover glass is the usual expedient, but this adds un-
necessarily to the weight and thickness of the slide. In view of
the possibilty of wet and dirt getting on the film side of the plate
during the grinding process, it is very advisable to formalin, dry
and varnish the slide before grinding. Put the slide in a printing
frame, glass side out, and grind with a small rubber. Take care
that the slide is well backed up, and that the springs are strong
enough to hold it up against the rubber. It can easily he packed
up with a few spare or spoiled plates, or with cardboard, and
then there will be no fear of the plate giving from the rubber,
and so letting wet in under the frame rebate. When ground,
the glass is cleaned while still in the frame, and on removal the
film side should be found to be perfectly clean.

A series of three screens for general and special work is ob-
tained as follows : Take three pieces of negative film and immerse
them without any exposure at all in any non-staining developer
free from bromide. At the end of twenty minutes remove two
pieces from the developer, and fix and wash them in the usual
way. At the end of twenty minutes remove the third piece from

FOCUSING THE CAMERA

le developer, and fix and wash that also. Next, iodize this
[third piece together with one of the others in a solution of iodine
' in potassium iodide. When ilic action is complete, rinse the
pieces and bleach them in dilute ammonia. Then wash and dry.
Finally, take the remaining film and immerse it in a solution
containing ten grains of potassium bichromate, and five grains
of hydrochloric acid to every ounce. When the chIori2ing action
is complete, rinse the film and put it into a fresh plain hypo
fixing bath for ten minutes ; then wash well and dry. You now
have three screens of different degrees of density.

No. I is a dense iodide screen, No. 2 a thin iodide screen, and
^o. 3 a thin "chromimn" screen. No. i screen will be an ex-
cellent substitute for the ground glass in all ordinary work. It
an be used without a magnifier or with one, and in either case
[it will show detail that would not be visible on the screen of
round glass.
No. 2, the thin iodide screen, cannot well be used without a
magnifier, but while it is too nearly transparent to permit focus-
sing with the eye alone, it shows enough grain to render the
lusc of the magnifier easy. There is no accommodation difficulty,
lind the detail visible on the screen is a revelation to those who
ave never used anything but ground glass. This screen is of
ecial value for indoor work, such as architectural interiors and
spying.

No. 3, the chromium screen, is quite useless without a mag-
nifier, being almost transparent to the eye. But with the magni-
Ser a very fine grain becomes visible, and as it is perfectly easy to
keep this grain and the image in focus at the same time, there is
ao accommodation difficulty. This screen is a substitute for clear
|glass, and is especially adapted for copying and for low-power
Qhoto-mlcrography. For high-power work it does not seem pos-
^ble to find any good substitute for clear glass, but with moderate
:>wers the No. 3 screen seems to show almost as much detail as
the clear glass, while It has not its disadvantages.

The screens can be ruled in pencil or with fine cuts to give
{datum marks. A cross ruling of fine cuts made with a lancet
Itnay be used but this is only a matter of personal choice. The
(surface is somewhat readily abraded in the case of No. 2 and
INo. 3 screens, hence they should be used carefully. It must be

MOTION

PICTURE PHOTOGRAPHY

remembered that no fine grain screen shows such a bright image
as ground glass. In comparison the image looks dull, but this is
a very minor matter, and the extra detail visible more Ihaa
compensates for the loss of brightness.

Douglas Carnegie, writing in reference to tlic fine focusing
screens made according to the formulae given above, says that
though the latter give much more detail than ground-glass screens,
yet they labor under the disadvantage that, with the exception of
a small ponton of the image which happens to lie in the neighbor-
hood of the line joining the eye with the optical center of the
lens, the image as a whole is much dimmer tlian in the case of
the coarser ground glass screens, and, therefore, the eyes must
be very carefully shielded from extraneous light, in order to per-
mit of the composition and proper centering of the picture on
the screen.

A novel screen is made as follows : A plate which-^ has been
exposed in the camera to a uniformly lighted sheet of paper is
developed, fixed, and then placed in a bath of hydrogen peroxide
acidulated with sulphuric acid. The bath is warmed to a tem-
perature of about 20 degrees centigrade. In a short time the
hydrogn peroxide removes the developed silver and concomi-
tantly some of the gelatine in which the silver was embedded,
leaving the remaining gelatine in a very faintly opalescent con-
dition. The plate is now washed, treated with Farmer's reducer
if it still looks brown, and dried. A screen so made has just
enough optical irregularity to prevent the image being viewed
through it, but not enough to militate against the pre-
sentation of a very fine detail in the focused image. There
is sometimes failure to get a good screen by this process even
when observing the same conditions that led to satisfactory re-
sults in previous trials.

A method of focusing, which avoids the trouble of "accommo-
dation," which takes place when a magnifier is used with a focus-
ing screen containing a transparent patch, is as follows: The
screen used is a plate of glass fairly heavily ground all over, with
a view to a bright general image, with the exception of a small
circular central spot, which is left transparent, Such a screen is
made in a few minutes by sticking a small washer on the center
of the plate and grinding round this with carborundum powder,

•0

FOCUSING THE CAMERA

using as a muDer a small piece of flat glass to which a slab of
wood has been stuck to act as a handle. A small strip of tinfoil
cut wilii a razor is stuck across the transparent portion of the
screen. On the unground surface of the glass, just over the
region of the transparent disc, a small adjustable mag-
niBer of about yi inch focal length is permanently fixed.
The magnifier actually used was constructed from a cheap
linen tester. The magnifier is focused on the edge
of the tin-foil slip and set It is not necessary to bestow any
especial care on this adjustment. Tlie lens is now racked until
there is no apparent relative movement, parallax between the
edge of the slip and any selected portion of the image seen
through the magnifier when the eye is moved laterally across the
field of view of the magnifier. This being the case, the lens
image must of necessity lie precisely in the plane of the front
surface of the screen. The function of the magnifier here, it will
be noticed, is not to aid the attainment of that very uncertain
condition, the exact positron of clearest visualization of fine de-
tail in the image, but simply to magnify a displacement. Hence
there can be no complications arising from unavoidable accom-
modative changes in the eye.

The delicacy of this method of focusing is quite surprising; the
most insignificant rotation of the focusing pinion from the posi-
tion of zero parallax produces an easily perceptible relative dis-
placement of the tin-foil edge and any selected image detail.

Chapter VII
PREPARATION FOR THE DAY'S WORK

MOST studios, up to a recent date, have been in the habit
of furnishing the cameraman with all of his apparatus,
and the best of them have maintained mechanical depart-
ments where such apparatus couM be kept tuned up to the best
mechanical perfection. The increasing demands upon the limited
facilities of these machine shops for the repair of factory ma-
chinery, such as perforators and printers, coupled writh a shortage
of the necessary number of cameras, has retarded the work
of camera repair and put into the background that primary re-
quisite for the making of good negatives, a camera in perfect
mechanical condition. So bad has this situation become, and the
number of new studios which have started without even a pre-
tense of a machine shop, that many of the more conscientious
operators have purchased their own outfits and fitted them up at
their own expense in order to have the facilities for turning out
work of which they need not be ashamed.

The cinematographer must learn to be on the job constantly,
to be prepared always for whatever emergency may arise, to have
his camera loaded and ready to shoot when the scene is rehearsed,
to use judgment and tact, to keep in mind the dignity and im-
portance of the proper photographing of the picture, and to in-
sist, as far as consistent with holding his job, that he be furnished
with every reasonable facility for the production of the best qual-
ity of work.

He should make it his business to know whether it is for the
best interests of the company to sacrifice a small percentage of
photographic quality and take pictures in a waning light in
order to finish with a large cast so that it will not be necessary to
call them a second day, or whether the improvement in better
negative will justify the expense involved in quitting when the
light is getting poor and hiring the large cast again the second
day. Confer with your director at the close of work each day
and schedule your work for the next day. It does away with the

PREPARATION FOR THE DAY'S WORK

haphazard method; it saves money for the concern, and, if you
train yourself to do more, you can cam more.

Let us assume that the cameraman reports for duty on a certain
morning. He will be assigned to a director who usually says:
"We work on exteriors today," or "Set up in the studio," and
will designate a certain scene. This is about all the information
the cameraman will get. He is supposed to know exactly what
to do. If he follows our instructions he will not be in a
moment's doubt. Go to the office or stock-room and ask for i,6oo
ft. of stock (negative stock), be sure it is perforated — that is to
say either ask whether or not it is perforated or look for a mark
on the can stating this.

In some studios it is customary to draw cnouph film for several
days or a week's supply, but this can be ascertained by judicious
inquir>'.

Another important matter is to be sure to ask for X-back film
if the weather is cool. Most studios begin using X-back film
about September ist and continue doing so through the winter
until about May, In California, X-back is seldom used as the
weather does not get cool enough to cause electrical markings, or
"static" as it is called.

X-back is film which has been coated on the back with a gum
or resinous substance by the manufacturer. This backing tends
to keep the celluloid base of the film from actual contact with
the camera as it moves through and therefore prevents the fric-
tion from acting on the celluloid and producing electrical flashes
in the camera. It is always safer whenever there is the slightest
doubt about the weather being cool enough for "static" to ask for
X-back. It costs (he studio no more and the emulsion is exactly
the same and all the backing washes olT in the first few minutes
in the developing solution. Many workers use it the whole year
round.

Anyone who has ever seen a fine scene utterly ruined by a
series of fern-like black lines — static — which magnify on the
screen until they look like the branches of a tree — will appreciate
the advantages of using X-back film for X-back certainly does
prevent static. I have never been bothered with a foot of static on
X-back although on days only slightly chilly I have had some
wonderful criss-cross patterns on films when I did not use it.

MOTION PICTURE PHOTOGRAPHY

After getting the film, go to the dark room which you should
also ask for and load your magazine by the light of the ruby
lamp therein.

Allow about a foot of film to project from the slit in the maga-
zine.

In the Pathe magazines there arc two slits. The proper method
to load this magazine is so the ribbon of film will exit through
the left hand slit when the magazine is laid on the table with the
two slits at tlie bottom facing the operator. It must also go
through the slit with the emulsion of the film facing the roller
which is just inside the slit

In all cameras the magazines must be so loaded that the film
will leave the magazines with the film in such position that the
emulsion side will be TOWARD the lens IN ALL CASES.

When you have loaded four magazines be sure you have at
least one more empty to take-up the film you arc going to expose.
It is safer to have two empties on hand. If your work is to be
exterior it is a good idea to pack a small changing-bag along. It
takes up very little room and is of great value in case of a
"buckle" or "twist" in the film inside a magazine, as sometimes
happens.

Sec that the camera is properly oiled. This means that every
part that moves or rotates on another must have a thin film of
oil upon it at all times. The best oil to use on cameras is sperm
oil. The old fashioned sewing-machine oil is excellent. The
much exploited patent oils that are advertised to clean, prevent
rust and pretty near anything from wear and tear to hook-
worm, are useless. They contain little or no "body" and a
camera lubricated with "4 in 5" or "6 in i" or similar oils will
wear out in a few months.

On the other hand heavy greasy oils tend to gum up and collect
dust. Vaseline or cup grease should never be used on anything,
not even gears in a camera. Graphite is dangerous as it clogs
oil holes and prevents oil from reaching hidden bearings.

Next be sure your still camera shutter is working and the
holders loaded. The cameraman is expected to take "stills" of
his scenes and it is not considered necessary to tell him to bring
his "still" along. He always takes it along whether needed or
not. A dozen plates or cut films are sufficient and all that will
be required.

PREPARATION FOR THE DAY'S WORK

Do not forget a focusing cloth. No tripod will be required
for the "still" as they are furnished by the studios with a screw
base to fit the motion picture camera-tripod. The usual size
still cameras furnished are 8 x lO.

Try always to be on time. If the director calls his people for
nine o'dock be ready and waiting in the studio auto or wherever
you know your place to be exactly at that hour. A call for nine
o'clock does not mean that you are to come drowsily into the studio
at that hour and then hold everybody up until you get film loaded,
camera packed, etc Be always ready on the job and you will
have won nine-tenths of the battle of installing yourself as a
valuable man in that studio.

Most studios provide assistant cameramen to take care of the
camerraan's equipment, but he is a wise cameraman who loads and
unloads his own magazines and sees that ever>'thing is ready
himself. It is proper and advisable to allow the assistant to
carry the equipment and load it in the auto but it is highly ad-
visable for the cameraman himself to take a last look to see that
all is there. I have repeatedly found that when an assistant re-
ported "all is on board" some small unimportant piece like the
camera itself was peacefully reposing in the dark room.

A good assistant in whom the cameraman can place absolute
tnist — even to the confidence of his position — would be a boon
indeed but, I greatly fear, "there ain't no such crittar.'* Long
before an assistant becomes so perfect he has worked his way
into a better position. But the assistant is important in his way.
He carries the heavy pieces and the reflector, holds the reflector at
the angle which the cameraman sets it, holds up the slate with the
number on it to photo at the end of the scene, helps steady the
camera in high winds, hands the plate holders for stills to the
operator, sets up and takes down the cameras and makes himself
useful in many ways.

Do not hurry with your work of threading-up camera or get-
ting set. Be sure everything is correctly and carefully done.
Never say "ready" until you are really sure you are.

Upon returning from "location" it is advisable to take the
rolls of exposed film out of the magazines, can them and see that
they go to the developing room at once. They are then out of
your hands and you will feel better satisfied than if they lay in

MOTION PICTURE PHOTOGRAPHY

the magazines over night. I£ anything liappens to the film then
it is not your fault.

When leaving your dark room for the night be sure the ruby
and other lights are out, the camera and magazines on the table
or slielf— NEVER ON THE FLOOR— the door locked and key
in your pocket.

Experience in photographic work is the best foundation for a
cameraman's job. The ranks of the cinematogrophers of the pres-
ent have been recruited from strange places in many instances.
Most of the best men have worked their way up from some fihn
factory position — they have worked in dark rooms, they have
finished stills, but at the same time they were ambitious. Most
of them had a camera or kodak of their own and they took their
little cameras out on Sundays and made snapshots. During the
evenings of the week they developed and printed them. They
got books on photography from the public library and bought
photographic periodicals and they read and studied them. While
they were at work in the film factory they learned all they could
from their fellow workers. They earned each promotion by
hard work and study, and at last, after a thorough apprenticeship,
they arrived at the position of cameraman. But if they became
good photographers they did not stop when they had learned
to thread the camera and turn the crank; there were lots of things
to be learned about lighting and about artistic composition
and posing. There was much to learn about lenses, about trick
work and visions, and then beside all this and just as important,
too, as the technical knowledge is the co-operation and co-ordina-
tion with the work of the director. It is essential to the best
work that the photographer be able to catch and instill into his
picture the same spirit and motive which actuates the director
who produces it. Unless the photographer understands and ap-
preciates what his director is endeavoring to do, he cannot pro-
duce the best work.

From the ranks of the newspaper photographers have come
some of the best topical news cameramen. Theirs is practically
a separate branch from the work of those who make dramatic
pictures, and wlulc numbers of them have gone in very success-
fully for studio work on dramatic pictures the qual!fications which
make for the success of a topical film weekly photographer are

PREPARATION FOR THE DAY'S WORK

mostly different from those of the photographer who works with
a director in the production of staged stories.

Many of the men who are now turning out productions have
learned as camera boys or assisiahts to cameramen and their
success has depended much upon the preceptors under whom they
worked. Most of them realize the handicap imposed upon them
by their lack of laboratory experience, and only by serious study
from whatever sources available to them have they been able to
overcome their lack of training. Unfortunately, there are many
such at work taking pictures now who lack this training so neces-
sary to the production of the best work.

The relations between the cameraman and the director of a
picture are rarely as intimate as they should be. The production
of a film in a proper and fitting manner is one that requires the
closest co-operation between every factor of the working forces
and the cameraman and director are the two greatest factors in
this production. When they do not understand one another;
when they work at cross purposes, it is evident that the produc-
tion must suffer.

The director is at the mercy of the cameraman for the proper
interpretation of his ideas upon the screen. Each necessarily im-
poses all of his own limitations upon the other and it is only
through a thorough understanding and the closest co-operation
that these limitations are prevented from conflicting with the per-
fection of their work.

There are many cameramen who are jealous of allowing their
director to learn what he ought to know about photography and
the limitations of the camera apd there are also many directors
who are too prone to regard the cameraman as a mere mechanical
accessory, possessing little or no brains. When these conditions
obtain neither can respect nor have any great consideration for
the ideas of the other, but when the director realizes tliat his
cameraman is a master of his craft, understands and knows what
he can do with the camera and when the cameraman knows and
realizes that his director knows his business, has a concrete idea
as to what he wishes to portray upon the screen and knows that
what he wishes to portray can be photographed so as to interpret
his idea to a spectator, then the cameraman and the director have
reached an understanding under which they should ht able to
produce very nearly perfect pictures.

•T

MOTION PICTURE PHOTOGRAPHY

Both cameraman and director should realize that not only are
they being paid a salary to produce the best of which they are
capable, but they should also have a sense of the dignity of the
task which ihcy are doing, Even the production of a rough-and-
tumble slap-stick comedy has a dignity attached to its production.
"Anything worth doing is worth doing well," although a trite
saying, still holds a world of meaning and though well worn by
long usage, is a motto which might well hang above every direc-
tor's desk and in every cameraman's room.

Too many cameramen and too many directors, as well, fail to
understand why they do not make a greater success, when they
are satisfied with any old thing and perform a task just sufficiently
well to enable them to "get by."

I have met many directors who seem to think the best training
in stage craft and drama can be obtained from all-night poker
parties and the infiltration of booze. I know cameramen who
have kept their photographic eye in practice by sighting along
the billiard cue and who get the largest part of technical training
from the comic supplements of the Sunday newspapers. Yet
they wonder why some cameramen are called "crank turners.**

Perhaps some of you boys think this is rather drastic stuff,
that I slam it in too hard once in a while, but mark this — the quiet
fellows who are drawing down the real figures on their pay
checks on Saturday night arc the boys who put brains into their
business, who are "Jerry on the job" and "Johnnie on the spot"
when it comes to producing the goods. What they don't know
they learn somehow. They don't belong to the clique of those
who know too much to learn any more. They were not too proud
to exhibit their ignorance when it came to a question of some-
thing they didn't know, but went and asked someone who did
know, or spent the necessary time to dig it out for themselves
from some text-book where they could find what they needed.

There has been much talk recently of overcrowding the profes-
sion of cameramen thereby bringing about a general reduction
in salaries. The man who knows his business does not have to
worry : the man at the top will always get the top-notch salary.
If you have the determination and stamina to learn and apply
what you should know, you will have little occasion to worry
about any reduction in salary. One of tlie best indications of this

Chapter VIII

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

By J. I. Crabtree
(Research Laboratory, Eastman Kodak Co., Rochester, N. Y.)

ALTHOUGH the majority of amateur photogfraphers prefer
to purchase photograpliic chemicals in a condition ready
for use, in the case of advanced amateurs, professional
photographers and motion picture producers who use chemicals
on a large scale, it is customary for them to prepare the various
photographic solutions from the component chemicals.

In order to be able to prepare correctly any and every solution
used in photography a knowledge of the properties of the chemi-
cals used and of the chemical reactions involved during the mix-
ing is essential, though by adhering strictly to printed directions
it is usually possible for an unskilled worker to prepare the de-
veloping and fixing solutions as generally used. However, in-
stHKtions for the use of various materials differ. For example,
in the case of some developing formulae it is recommended to
dissolve the Elon first, while according to others the sulphite
should be dissolved first. Both methods may be right, but if a
systematized method of mixing is followed, and especially if the
photographer has a knowledge of the reactions involved, then he
can proceed to mix any developing solution with confidence, and
what is more, he will be able to locate the trouble if for any
reason the solution does not work correctly after mixing.

It is the purpose of the author to describe in as non-technical
language as possible the systematized method of preparing solu-
tions now practiced in the Research Laboratory of tlie Eastman
Kodak Company.

Definitions

A solution of any kind is obtained by dissolving a solid or a
liquid in another liquid (or solid). The substance being dis-
solved is called the solute and the liquid in which it is dissolved
is called the solvent. The extent to which the solute is soluble in

100

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

the solvent is called its solubility and when the solvent will hold
no more of the solute it is said to be saturated.

The degree of solubility of any chemical depends on the nature
of the solvent and on the temperature, which should always be
stated.

If a saturated solution is cooled down to a lower temperature,
crystals usually form which settle out until the saturation point is
reached at that particular temperature, though in the case of a
substance like hypo, if all dust is excluded, crystals do not sepa-
rate out on cooling, and a so-called super-saturated solution is ob-
tained. However, if a small crystal of hypo is added to the
solution, crystals immediately form and continue to grow until
the saturation point is reached. The best method of preparing
a saturated solution therefore is to dissolve the chemical in hot
water, cool to room temperature with shaking, allow to stand,
and filter.

Meaning of "Water To"

When a chemical is dissolved in water the volume of the solu-
tion is usually greater than that of the water used, because the
particles or molecules of the chemical occupy a certain space when
in solution. In case two liquids arc mixed, the final volume of
the liquid is not necessarily equal to the sum of the volumes of
the liquid is not necessarily equal to the sum of the volumes of
fifty volumes of alcohol when added to fifty volumes of water at
70* F., produce ninety-seven volumes of the mixture and not one
hundred. Moreover, equal weights of different chemicals do not
occupy the same volume.

In photography we are concerned only with the weight or
volume of each chemical in a fixed volume of the solution, so
that when mixing, the chemical should be dissolved in an amount
of water appreciably less than that called for in the formula and
then water added up to the amount stated.

The Metric System of Weights and Measures

In photographic practice, solids are weighed and liquids are
measured either by the metric or the avoirdupois system.

Although a large majority of photographers use the avoir-
dupois system of weights and measures, this system is incon-
venient and complicated as compared with the metric system.

IDl

MOTION PICTURE PHOTOGRAPHY

The metric unit of length is the meter (which means measure).
The meter is divided into one hundred parts called centimeters,
abbreviated to cms.

The unit of volume is the cubic centimeter, written cc, or ccs.
in the plural, looo ccs. being equal to one liter or I L. The cubic
centimeter is sometimes termed a milliliter or ml. (meaning one
thousandth part of a liter) though the term cc. is satisfactory for
photographic purposes.

The unit of weight is the gram which is the weight of i cc. of
water at 4° C, at which temperature a given volume of water
weighs the most. The gram is written Gni. for short, the capital
letter G being used to differentiate between Gms, (grams) and
grs. (grains).

For compounding photographic formulae only Gms., ccs., and
liters are used, and fractions are always expressed as a decimal
just as in the case of the U. S. currency which is a metric cur-
rency. The beginner should therefore think of grams and parts
of a gram as if they were dollars and cents. Thus 5.35 Gms.
corresponds to ?5-35 or 5 35/100 dollars.

The Avoirdupois System
In photography the following table is used:

Weight

437 grains = i ounce

8 drachms^ i ounce.

16 ounces = i pound

J'olume
. 60 minims =; i fluid drachms

8 f^uid drachms =^ i fluid ounce
4S0 minims = i fluid ounce

16 ounces = i pint

128 ounces = i gallon

The Conversion of Formulae

Every photographer should be able to convert a fonnnla 8:iven
in avoirdupois terms into metric equivalents without reference
to a table. It is simply necessary to remember that —

15 grains =^ i Gm.
I ounce = 30 Gms.

1 fluid ounce = 30 ccs.
I gallon = 4 liters

HOW TO PREPARE PHOTOGRAPH IC SOLUTIONS

from which it is readily deduced that —

2 pounds (roughly) ^ i kilogram
I ounce " = 450 ETS.

I pint " = 550 CCS.

I CO- " = 50 minims

The foregoing conversion table is not strictly correct, for
example one gram^ ^5^32 grs., i oz. = 28.35 Cms. and i fluid
oz. = 29.43 ^^^' ^" taking i Cm. as an equal to 15 grs. we are
making an error of four parts in 154. or nearly 3%, but in
photography an error of $% in most cases is pennissible. Thus
if a formula called for 4533^ grs., if this were cut to an even
450, the difference would not be detectable by photographic means,
though if a quantity of 6^ grains were cut to 5 grs., then the
error (20%) would be serious.

Uniformity in Formulae

Formulae should always be given in both metric and avoirdu-
pois equivalents, but in some cases the proportions are given for,
say, 40 ozs., in one case and i L. in the other. Now, 40
ozs. =: 1,200 ccs., so lliat the several quantities are not equivalent.
This leads to error in case the chemicals arc weighed out with
avoirdupois weights and the solution made up to strength in a
liter graduate, though if these quantities are given for 32 ozs. of
solution which are equivalent to 9O0 ccs.. or roughly I l*. no
serious trouble will arise if the above mistake is made.

The order in which the ingredients are given in the formulae
is of importance. In some cases water is placed first, in other
cases last, but since all developers are mixed with water, its posi-
tion should be last in the formula. The ingredients should be
given in the order in which they are dissolved, which is as fol-
lows: (i) preservative, (2) developing agent, (3) accelerator, (4)
restrainer, (5) water to.

Percentage Solutions

In photography two kinds of solutions are used as follows :

(a) A solid in a liquid.

(b) A liquid in a liquid.

103

MOTION PICTURE PHOTOGRAPHY

only one salt such as potassium bromide, sodium carbonate, etc.,
a 10% solution is most convenient because by multiplying the
volume of the solution in ccs. by lo we get the number of grams
present in the solution. Thus 75 ccs. of lo^fc potassium bromide
contain 7.5 Gms.

The limiting strengfth of solution which it is possible to make
in any particular case depends on the solubility of the chemical
and as the solubility diminishes with temperature a solution
should not be made stronger than a saturated solution at 40* F.,
otherwise in cold weather the substance would crystallize out.
(The reader is referred to tables of solubilities given in most
handbooks.)

A stock solution of sodium sulphite should be made as strong
as possible (15% of the desiccated salt) because at such a
strength the solution oxidizes very slowly and will therefore
keep, whereas in weaker solution it combines with the oxygen
in the air very readily and is then useless as a preservative.

Apparatus
Scales

For quantities up to too Gms. a double pan balance should
be used and a larger one for quantities up to i.ooo Gms. For
still larger quantities a platfomi scale weighing in pounds may be
used, because large metric scales are not readily procurable.
For preparing small amounts of sample developers a small chem-
ical balance weighing in hundredth parts of a gram is necessary.

Mixing Vessels

For small quantities of solution conical glass flasks are the
most suitable. For larger quantities use enameled buckets.
Earthenware crocks are usually imsatisfactory because when the
glaze cracks, the solutions penetrate into the pores and thus con-
taminate any other soltHions subsequently mixed in them.

A wooden stick or paddle is the best form of stirrer, but a
separate one should be used for each solution so as to eliminate
the possibility of contamination.

The paddle may also be used to measure out a definite volume
of solution in a tank or crock by cutting notches in the paddle to
correspond with definite volumes when the paddle is held ver-
tically. Such markings are only applicable, however, to the par-

108

HOW TO PREPARE PHOTOGRAP HIC SOLUTIONS

ticular tank or crock for which the paddle was graduated, so that
a separate paddle should be used for each tank or crock unless
they are of the same shape and capacity.

Chemicals should be weighed out and the solutions prepared in
a separate room, and care should be taken when handling
such substances as hydroquinone, rcsublimed pyro, potassium
ferricyanide, etc., not to shake the finer particles into the air,
othenvise they will enter the ventilating system and settle out
on benches, negatives, and prints, and cause no end of trouble in
the way of spots and stains.

Weighing

Weigh out chemicals on pieces of paper and after transferring
to the mixing vessel do not shake the paper but drop it into the
sink and allow water to fiow over it, thus dissolving the dust.
Larger quantities are most conveniently weighed out in buckets.

Me.\surimg

For small quantities, a glass graduate marked off in ccs. or
ounces should be used, for larger quantities use a bucket pre-
viously graduated, or mark off the inside of the tank or crock
used for mixing. When measuring a liquid in a glass graduate
place the eye on a level with the graduation mark and pour in
the liquid until its lower surface coincides with this level. Owing
lo capillary attraction the liquid in contact with the walls cf the
graduate is drawn up the sides so that on viewing sideways it
appears as if the liquid has two surfaces. All readings should
be made from the lower surface and at room temperature because
a warm liquid contracts on cooling.

Dissolving

The rapidity with which a substance dissolves In any solvent
depends on its solubility and degree of fineness, the temperature
of the solvent, and the rate of stirring. Since a chemical is
usually more soluble in hot water than in cold, the quickest way
of mixing a solution is to powder it and dissolve in hot water
by stirring. In the case of a few substances, like common salt,
which are only slightly more soluble in hot than in cold water, the
use of hot water is of no advantage.

]09

MOTION PICTURE

HOTOGRAPH

Since most solutions are intended for use at ordinary tempera-
tures, if hot water is used for dissolving, the solution must be
cooled again if it is required for immediate use. Usually the
time taken to do this is less than the extra time which would be
taken up in dissolving: the chemical in cold water. When mixing,
therefore, as a general rule, dissolve the chemical in as small an
amount of hot water as possible, cool oS, and dilute with cold
water.

After diluting with water, thoroughly shake the solution if in
a bottle, or stir if in a tank, otherwise the water added will
simply float on top of the heavier solution.

When mixing a solution in a tank, never add the dn,' chemicals
to the tank but always make sure that the chemicals arc dissolved
by mixing in separate buckets and filtering into the tank.

If the water supply is not sufficiently cold, so that on diluting
the hot solution the final liquid is not at the required temperature,
the hot solution should be cooled by means of ice placed in a
cloth bag to filter out the dirt.

In the case of anhydrous (dry) salts such as desiccated sodium
carbonate, sodium sulphite, etc., always add the chemical to the
water and not vice versa, otherwise a hard cake will form which
will dissolve only with difficulty.

Filtering

The purpose of filtering is to remove suspended matter such
as dirt, caused by the presence of dust in the chemicals used, and
also any residue or undissolved particles which might settle on
the plates, film or paper during development Here are several
methods of removing such particles:

I. Allow the solution to stand and draw off or decant the
clear supernatcnt liquid. This method is particularly useful
when the suspended matter is so fine that it ^vill pass through a
coarse filter.

Since coarse particles settle quickly, the rate of settling of a
scmi-colloidal sludge can usually be hastened by mixing the solu-
tion in hot water, because the heat tends to coagulate the sus-
pension and causes the particles to cluster together. Thus if
crystals of sodium sulphide, which are brown due to the presence
of iroOj are dissolved in hot water the colloidal iron sulphide

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

coagulates and settles out rapidly leaving a perfectly colorless
solution.

2. Filter the solution through fabric or filter paper. Filtering
through paper is usually a slow process and the continual drop-
ping of the solution exposes it to the air thus causing oxidation.
It is usually sufficient to filter through very fine cloth or muslin
which has been washed thoroughly, otherwise the sizing matter in
the fabric will be washed into the solution and settle out as a
sludge.

fie. n

3. As a modification of method 2, when mixitig a quantity of
solution in a tank, stretch a filter bag made of cloth over the
tank, place the chemicals in the bag (about 6 inches deep) and
allow hot water to flow into it. In this way the chemicals are
dissolved and the solution filtered at the same time. A separate
bag should be used for each solution so as to eliminate all risk
of contamination.

The method of supporting the bag is shown in Fig. $2 the bag
being stretched over the wooden frame and held in place by
means of four iron bars passing through loops along the edges
of the bag. For mixing hypo, such a bag is indispensable.

Ill

MOTION PICTURE PHOTOGRAPHY

In case of deep tanks such as are used for developing: roll film
and for motion picture work, the wooden frame can be dispensed
with by adopting the arrangement shown in Fig. j^. The doth
bag about 6 inches deep is supported by means of iron bars pass-
ing through seams along opposite edges of the bag, and in turn
the bars are held in place either by means of two pieces of wood
passing over the ends of the bars, as shown, or by metal stirrups
fitted to the sides of the tank.

Pic. St

It is important that the bag used should be shallow (6 to 9
inches deep), otherwise it will dip into the solution and the
chemicals will dissolve very slowly.

4. A combination of methods i and 3 which follows is the
best and most desirable:

(a) For quantities of solution up to S gallons, filter through
cloth into a bottle or crock fitted with a side tube and pinch cock.
In this way the fine particles settle out but the drainage lube is
sufficiently high so as not to disturb the sediment. {See Fig. 34.)

(b) For motion picture work the best arrangement for mixing
is to place the chemical room immediately above the developing

tfOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

room and to mix the solutions in large wooden vats or enameled
tanks connected with lead piping to the developing and fixing
tanks in the dark room underneath. The solutions can then be
mixed in advance, allowed to settle and be tested, so that only
perfect solutions pass into the tanks located in the dark room.

Removing Scum
When mixing a chemical solution, if method 4 above is not

^i8

^m.

Fig. li

adopted, and especially if the solutions are not 6ltered, a scum
usually rises to the surface consisting of fibers, dust, etc., which
should be skimmed off with a towel.

When a fixing bath has been used for some time and is allowed
to stand undisturbed for a few days, any sulphuretted hydrogen
gas which may be present in the atmosphere forms a metallic
looking scum of silver sulphide at the surface of the liquid, and
on immersing the film this scum attaches itself to the gelatine
and prevents the action of the developer. Any such scum should
be carefully removed, before use, with a sheet of blotting paper.

113

MOTION PICTURE PHOTOGRAPHY-

colored by the presence of oxidation products, these may be par-
tially removed by boiling after adding to the sulphite solution. In
this way the oxidation products are reduced by the sulphite to
paraminophenol. The solution should be cooled again before
adding the carbonate. If pure chemicals are used such a pro-
cedure is, of course, entirely unnecessar>'.

Bromides and iodides arc added to a developer to compensate
for any chemical fog produced by the developer, or inherent in
the emulsion. It is immaterial at what stage during mixing the
bromide is added.

When mixing a developer the following rules should therefore
l>e followed t

1. Dissolve the preservative first. In the case of Elon dis-
solve only a portion of the sulphite first, dissolve the Elon, and
then add the remainder of the sulphite.

2. Make sure that one chemical is dissolved before adding
the next. If the alkali is added before the crystals of the de-
veloping agent are dissolved, each crystal becomes oxidized at
the surface and the resulting solutifw will give fog.

3. Mix the developer at as low a temperature as possible.

4. In the case of desiccated chemicals like sodium carbonate
and sodium sulphite, add the chemical to the water and not vice
versa.

Two practical methods of mixing are possible, as follows :
(a) Dissolve all the chemcaJs in one bottle or vessel by adding
the solid chemicals to the water in the correct order (in the
formula the ingredients should be named in the order in which
they arc dissolved 1. For example, to mix the following formula
proceed as follows:

Sodium sulphite 75 Cms,

Kloa 10 Gms.

Hydroquinone 5 Gms.

Sodium Carbonate 50 Gms.

Potassium Bromide 1.5 Gms.

Water to i U

Dissolve about ten grams of the sulphite in about 750 cc of
warm water and then dissolve the Elon. Now dissolve the re-
mainder of the sulphite and then the hydroquinone. Finally add
the carbonate and bromide and dilute to 1,000 cc.

lit

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

For large quantities the filter bag method should be used, the
chemicals being placed in the bag and dissolved in the above order,
(b) An alternative method is to dissolve the preservative and
developing agent in one vessel and the carbonate and bromide in
another, cool and mix. This method is the safest and best for
quantity production.

For example, to mix the following motion picture developer
proceed as follows:

Sodium Sulphite 4 lbs.

Hydroquinone 13 or.

Sodium Carbonate 4 lbs.

Potassium Bromide 3 oz.

Water to 10 gal.

Dissolve the sulphite in about one ^llon of hot water, then dis-
solve the hydroquinone and filter into the tank. Then add one
gallon of cold water to the tank, dissolve the sodium carbonate
and bromide in one gallon of hot water and filter this into the
tank, immediately adding cold water up to ten gallons. The
object of adding cold water to the tank is to cool off the solution
before the carbonate is added.

Mixing Concentrated Developers

The extent to which a developer may be concentrated is deter-
mined by the solubility of the least soluble constituent, because a
stock solution should usually withstand cooling to 40' F. without
any of the ingredients crystallizing out. Usually, the hydro-
quinone and Elon come ont of solution on cooling, but by adding
alcohol (grain, wood, or denatured) up to a concentration of
10%, the crystallization is prevented, since the developing agents
are very soluble in alcohol.

The addition of the alcohol does not prevent the other ingredi-
ents, such as sodium sulphite, from cr^'stallizing out. In fact,
the akobol diminishes their solubility and therefore increases the
tendency to come out of solution.

A paraminophenol -carbonate developer is difficnk to prepare in
concentrated form, though by addinp^ a little caustic soda the
solubility of the pararoinophenol is increased and a stronger solu-
ttoQ can be thus prepared.

When preparing concentrated developers it is important to

117

MOTION PICTURE PHOTOGRAPHY

observe carefully the rules of tnixing^. To obtain a colorless de-
veloper take care to keep the temperature of the solution as low
as possible.

Two-Solution Developers

A two-solution developer is simply a one-solution developer
split into two parts, one containing the carbonate and bromide,
the other containing the developing agent and preservatives so
that the developer will oxidize less readily and therefore keep
well. The reason it is customary to keep a developer like pyro in
two solutions, is because pyro oxidizes much more readily than
Elon or paraminophenot with a given amount of preservative.

For purposes of mixing, only one solution developers need be
considered because the same rules regarding mixing apply in both
cases.

Developing Troubles

In order to explain the reason for any particular developer
trouble it is necessary to understand thoroughly what takes place
when the ingredients are mixed in the wrong order, or if any in-
gredient is omitted from the formula, also the effect of chemical
impurities. It is impossible here to indicate every possible
trouble but the more important ones may be listed as follows:

1. The developer gives fog or chemical fog. Fog is the chief
trouble caused by faulty mixing. It may be due to any of the
following reasons: Violation of the rules of mixing; mixing the
solution too hot; omission of the bromide: addition of too much
carbonate or too little sulphite ; the use of impure chemicals ; etc

2. The solution is colored. As a general rule the developer
when mixed should be colorless. If colored, the developer is
liable to give fog. In the case of a pyro developer mixed with
bisulphite which contains iron, the iron combines with the pyro
to form an inky substance which imparts a dirty red color to the
solution.

If a pyro developer is mixed as two separate solutions A and B»
the pyro solution which usually contains only carbonate and
bromide, should be perfectly colorless, though if carelessly mixed
in dirty vessels it may be colored brown by the presence of a
little pyro A.

3. If the solution does not develop, then either the developing
agent or the carbonate was omitted during mixing.

It*

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

How TO Mix Fixing Solutions

Fixing baths may be divided into the following classes:

1. Plain hypo solutions.

2. Acid hypo solutions consisting of hypo with the addition of
sodium bisulphite, potassium metabisulphite* or sodium sulphite
with acid.

3. Acid hardening hypo solutions.

1. Usually no difficulty is experienced when mixing a plain
hypo solution. \\Tien mixing a quantity of solution in a tank the
filter bag method should be used and the hypo dissolved in warm
water because the temperature drops considerably while the hypo
is dissolving. If a scum forms on the surface of the solution
while standing, it should be removed by drawing the edge of a
towel across the surface.

If a wooden cover is used for the tank, fungi often develop in
a hypo solution and produce acid substances which tend to turn
the solution milky. In such a case, the tank should be thoroughly
cleaned and the cover faced with sheet !ead.

A plain fixing bath, however, is seldom used because it gradu-
ally becomes alkaline from an accumulation of alkali carried over
by the prints and plates from the developer. This tends to soften
the gelatine, while the image continues to develop in the fixing
bath. If two prints stick together, less development takes place
at the point of contact causing uneven development. If the bath
is acid, the acid kills or neutralizes the alkali in the developer
carried over, thus preventing unevenness.

2. In order to mix an acid fixing bath intelligently it is neces-
sary to understand a little about its chemistry.

Hypo can be made by boiling together sodium sulphite and
flowers of sulphur until no more sulphur is dissolved. If acid
is added to a hypo solution sulphur is again liberated, forming a
mill^ solution known as milk of sulphur. If sodium sulphite is
present, however, any sulphur which tends to come out of solution
combines with the sulphite to form more hypo and the solution
therefore remains clear.

This sulphur cannot be redissolvcd by adding sodium sulphite
to the milky solution except by boiling. On standing it is apt to
settle on prints or plates as a scum All acid fixing baths there-
fore contain either sodium bisulphite, potassium me tabi sulphite,

119

MOTION

PICTURE PHOTOGRAPHY

or a mixture of sodium sulphite and some acid, and the following
directions for mixing should be followed :

(a) Do not add the bisulphite or add sulphite solutions to the
warm hypo solution. If the solutions are not perfectly cold when
mixed the hypo will turn milky.

Experience has shown that potassium mctabisulphite has less
tendency to produce milkiness than sodium bisulphite, though for
practical purposes the difiference is almost negligible.

Of the common acids, sulphuric, hydrochloric, acetic, citric,
etc., acetic, citric, and tartaric acids have less tendency to produce
milkiness for a given degree of acidity than sulphuric, which fact
would be expected from theoretical considerations.

(b) On keeping, an acid hj*po solution gradually becomes
milky, so that a stock solution of the sodium bisulphite, etc.,
should be kept and added to the plain hypo stock solution as re-
quired. For general purposes 50 cc. of a 50% sodium bisulphite
solution are added to 1,000 cc. of a 35% hypo solution. If any
considerable excess over this amotint is added, the hypo rapidly
turns milky owing to the liberation of sulphur, especially if the
weather is warm.

3, Acid hardening baths arc prepared by adding to hypo an
acid hardening solution wliich contains the following ingredients:

(a) An acid such as acetic, citric, tartaric, lactic, sulphuric,
etc., which stops development.

(b) A hardening agent such as alum, chrome alum or formalin.

The latter acts as a preservative in two ways : It prevents the
formation of sulphur hy the action of the acid on the h>-po, and.
also prevents the developer carried over into the fixing bath from
oxidizing and turning brown.

How TO Mix the Acid Hardeker

Prepare the acid hardening solution as a separate stock solu-
tion and add this to the hypo solution as required.

The order of mixing is important.

(a) When mixing in one vessel, first dissolve the alum in warm
water, then add the acid and add the sulphite immediately ; other-
wise, if the acid alum solution is allowed to stand, the aliun wilt

130

crystatize out again. It is sometimes recommended to reverse
the process, namely, dissolve the sulphite first, add the acid, and
then the alum, but unless the alum is finely powdered it does not
readily dissolve unless the solution is warm. In this case sulphur
dioxide gas is given o6f from the acid sulphite solution.

(b) The best method is to dissolve the alum and sulphite in
separate solutions, cool, add the acid to the sulphite and then
add the alum solution.

If the order of mixing is reversed and the alum first added to
the sulphite, a white sludge of aluminum sulphite is formed
which dissolves with difficult>' when the acid is added. If after
mixing the hardener is milky and a sludge settles out. there is a
relative insufficiency of acid. That is the acid u.^ed was not up
to strength, or too much alum or sulphite was added.

With all other hardening baths the order of mixing is the same.

Fixing Bath Troubles

I. Milkiness of the fixing bath.

Sometimes a fixing bath turns milky immediately on adding the
hardener and sometimes after being in use for some time. The
milkiness may be of two kinds :

A. If the precipitate settles very slowly on standing, the milki-
ness is due to sulphur caused by the following conditions :

(a) Too much acid in the hardener.

(b) Too httle sulphite or the use of impure sulphite (in which
case there is not sufficient presenit to protect the hypo from the
acid).

(c) High temperature. The hardener should only be added
to the hypo solution when at room temperature. If the tempera-
lure of the acid fixing bath is over 85" F, it will not remain clear
longer than a few days even when mixed correctly. The only
remedy is to throw the bath away and mix fresh solution as re-
quired.

B. If the milkiness disappears on standing for a few hours,
and a gelatinous sludge of aluminum sulphite settles out. this is
caused by:

(a) Too little acid in the hardener. For example, supposing
a formula calls for pure glacial (98%) acetic acid and 28% acid
is used by mistake, then we have added less than one-third the
reqtiircd amount.

MOTION PICTURE PHOTOGRAPHY

(b) Too little hardener in the fixing bath. When fixing
prints, a relatively large proportion of the developer is carried
over to the fixing bath. This soon neutralizes the acid and per-
niits the formation of aluminum sulphite. A fixing bath with the
correct proportion of hardener, when exhausted, still contains
alum and sulphite but no acid, and thche combine to fonn a sludge
of aluminum sulphite.

It is extremely important therefore to use only acid of known
strength. Avoid trouble by using neither more nor less acid than
is called for in the formula.

2. The bath docs not harden.

A frequent cause of insufficient hardening is the use of in-
ferior alum which does not contain the correct proportion of
aluminum sulphate. An exhausted bath which is alkaline will
also harden very slowly. Alum hardens best in acid solution.

Miscellaneous Solutions

The number of miscellaneous solutions used in photography
for intensifying, reducing, toning, etc., is so large that it is be-
yond the scope of this book to deal with individual cases. The
method of procedure is much the same as when mi.xing devclop-
ers» and the order of mixing is usually stated £i>ecificaUy.

StJBSTITUTION OF CHEMICALS

Occasion arises often when the photographer is out of stock
of some particular chemical and he is tempted to substitute one
chemical for another. In this chapter it will be shown how far
substitution is possible in the case of developing and fixing baths.
These remarks usually apply to solutions in generul.

StJBSTITUTES FOH POTASSIUM SaLTS

In view of the present scarcity of potassium salts and their
greater expense as compared with sodium salts, the question
arises as to what extent they can be replaced by salts of sodium
or ammonium.

As a general rule, for photographic purposes, a potassium salt
can be replaced by a sodium salt weight for weight, the error
caused by the difference in molecular weight of the two salts

(,Camrltty of the L'niteria} Fitm CcmfCmy)

A HAZARDOUS POSITIOK.

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

developing motion picture film on a reel when the developer may
splash on the floor, potassium carhonate cannot be substituted by
sodium carbonate. Because of the deliquescent nature of potas-
sium carbonate, the splashes of solution remain moist thus pre-
venting llie formaticm of carbonate dust in the air.

Caustic soda and caustic potash may be replaced weight for
weight in most formulae.

Ammonia and ammonium carbonate are seldom used in de-
velopers on account of their odor and the fact that they tend to
cause dichroic fog.

Desiccated and Crystal Sodas

Sodium carbonate and sodium sulphite are often supplied in
two forms: Crystals and desiccated or dry, which is sometimes
called anliydrous because it does not contain water of crystaliza-
tion.

Desiccated sodas possess the advantage that they occupy less
tlian half the bulk of the crystals, while desiccated sodium sul-
phite is much less liable to oxidation by the air than the crystalline
variety.

The sodas should be substituted as follows:

One part by weight of sodiiun carbonate (desiccated) for three
parts by weight of the crystals.

One part by weight of sodium sulphite (desiccated) for two
parts by weight of the crystals. I

4- The Restrainer.

Potassium bromide may be substituted by an equal weight of
sodium bromide. Ammonium bromide should not be used in a
developer because the alkali liberates ammonia gas and this too
tends to produce dichroic fog. •

Substitution in the Fixing Bath

Sulphites and Bisulphites.

The same remarks apply as to preservatives in the developer.

Alums.

An alum is a compound or double salt of aluminum sulphate or
chromium sulphate with either sodium, potassium or ammonium
sulphate. The hardening action is produced only by the alum-
inum or chromium sulphate, so that equivalent weights of alum-
inum sulphate and of sodium, potassium, or ammonium alum
should exert the same hardening action.

136

MOTION PICTURE PHOTOGRAPHY

Water dissolves about 2% of air at 70" F. When a developing
agent, like hydroquinone, is dissolved without the addition of sul-
phitGf the oxygen present in the water combines with the develop-
ing agent forming an oxide which will cause chemical fog.

Sulphuretted hydrogen gas present in sulphur water will also
cause bad chemical fog. The gas may be removed by boiling or
by precipitation with lead acetate.

Purification of Water

Water may be purified as follows:

1. By distillation: Distilled water should be used whenever
possible for mixing solutions.

2. By boiling: This coagulates the colloidal matter and
changes certain lime salts to the insoluble condition which then
settles out. Dissolved gases such as air. sulphuretted hydrogen,
etc., are removed. Tlierefore, unless the water contains an ex-
cessive amount of dissolved salts, it is usually suSicient to boil
it and allow it to settle.

3. By chemical treatment: If large quantities of water are
required, chemical methods of purification must be employed,
though it is only possible to remove lime salts, slime and col-
loidal matter in this way.

Excessive amount."? of dissolved lime salts are very objection-
able. After washing, if drops of water remain on the plates or
film, when the water evaporates, the dissolved salts in the water
become visible as a white scum.

The following methods of chemical purification may be
adopted :

(a) Add alum to the water in the proportion of one gram to
four liters. This coagulates the slime which carries down any
suspended particles, and the solution rapidly clears. This method
does not remove dissolved salts, while the small amount of alum
introduced into the water has no harmful effect on the developer.

(b) Add a solution of sodium oxalate until no further precipi-
tate forms. This method removes the calcium and magnesitmi
salts and coagulates the slime, though sodium and potassium salts
are left in solution.

(c) Most of the commercial methods of water softening may
be employed though such methods do not renx>ve sodium and
potassium salts.

138

HOW TO PREPARE PHOTOGRAPHIC SOLUTIONS

The "Decalso" process of water softening is one which can be
recommended. The water is passed through a tank containing
sodium aluminum silicate which is a Zeolite, and possesses the
power of exchanging its sodium for the calcium and magnesium
present in the water. When the Zeolite thus loaded with calcium
and magnesium is washed in a strong solution of common salt
(sodium chloride) it exchanges the calcium and magnesium again
for sodium and is thus regenerated, and in condition for further
softening. Full particulars may be obtained from the American
Water Softening Company, loii Chestnut Street, Philadelphia,
Pa.

Impurities ik Developing amd Fixing Chemicals

It is beyond our scope to indicate all the possible impurities
which may be present in photographic chemicals. For a more
detailed account the reader is referred to the paper by H. T,
Qarke on "The Examination of Organic Developing Agents"
(Phot, J. Amer., Nov., igi8, p. 481), which contains a number
of analysis of developers recently placed on the inarkct under
fancy names and containing such substances as starch, sugar,
salt, borax, etc

We are concerned only with the impurities which are not in-
tentionally added as adulterants, usually present in chemicals.

Impurities may have access to photographic chemicals in three
ways: (a) during manufacture, (b) during storage, (c) during
mixing and storage of the solution.

(a) If chemicals of repute are purchased, the photographer
need not worry about impurities.

If the Elon, hydroquinone or pyro is colored, the presence of
fogging agent should be suspected, although some colored sam-
ples do not give any more fog than colorless ones.

Many metallic compounds such as salts of copper and tin,
metallic sulphides, etc., exert a powerful fogging action even
when present only in minute quantities and should be avoided.
The following table indicates the nature and effect of the more
common impurities present in the chemicals used for developing
and fixing baths :

MOTION PICTURE PHOTOGRAPHY

L h^mi^ai

Ckitf Impurity \ Effect of Impurities

Pyro, hydroqui-
nonc, etc.

Oxidation products
and adulterants

Oicmical fog

Adulterants wenlcen the effect
of the developer

Sodium sulphite

Sodiuni sulphate

Keeping properties of the de-
veloper arc impaired

Sodium bisulphite

Iron and sodium
sulphate

Iron gives a dirty red solution
wiUi pyro

Caustic soda

Sodium carbonate

Decreases the accelerating
power

Hypo

Sodium sulphite

Sodium sulphate
and ammonium
sulphate

DiminUbes the fixing power

Alum

Diminishes the hardening ac-
tion

Chrome ainm

Ammonium sul-
phate and sul-
phuric acid

Excess of acid tends to causj
sulphurization of the fixing
Uth

Acetic acid

Water

Deficiency of acid cause.4 miiki-
ness of the acid tixing bath
due to the precipitation of

aluniintim sulphite

(b) For impurities introduced during storage see "Storage of
Chcmtcals,"

(c) If during mixing the water contains dissolved air and the
developing agent is dissolved before the sulphite, it becomes
oxidized and the oxidation product formed causes fog. (See
"Mixing of Developers," "Storage of Solutions" and article on
■'Chemical Fog.")

Storage of Chemicals

Chemicals should be stored in well corked or well stoppered
jars in a cool, dry place. Mbst chemicals are affected by atr
which contains oxygen, carbon dioxide pas, and moisture.

(a) Oxygen reatlily attacKS such substances as sodium sulphite,
especially in the presence of moisture, converting it into sodium
sulphate, which is useless as a preservative. With crystallized
sodium sulphite, the sodium sulphate forms on the outside of the
crystals as a powder; this may be washed ofT and the crystals
dried. It is necessary to make chemical tests to detect sodium
sulphate in desiccated sulphite.

Other substances which combine with oxygen, and are there-
fore said to be "oxidized," are sodium bisulphite and fwtassium
meta bisulphite and all developing agents such as pyro, hydro-
quinone, etc., which turn more or less brown, the extent of the
color roughly indicating the degree of oxidation.

(b) Carbon dioxide gas combines with substances like caustic
soda and caustic potash converting them into the corresponding
carbonated alkalis which are less reactive. If caustic soda is
kept in a stoppered bottle the stopper usually becomes cemented
fast by the sodium carbonate formed, so that it should be kept in
a waxed corked bottle. Owing to the solvent action of the
caustic alkalis on glass the inside of the glass bottle containing
caustic or strongly carbonaled solutions becomes frosted, though
the amount of glass thus dissolved away will usually do no harm.

(c) Certain chemicals have a strong attraction or affinity for
the moisture present in the atmosphere and gradually dissolve
forming a solution in the water thus absorbed. This phenomenon
is termed "deliquescence" and the chemicals arc said to "deli-
quesce." Familiar examples are ammonium thiocyanate, potas-
sium carbonate, caustic soda, caustic potash, sodium sulphide,
uranium nitrate, sodium bichromate, etc., which should be stored
in corked bottles and the neck should lie dipped in melted paraffin
wax.

As mentioned above, it is difficult to prepare a solution of defi-
nite percentage strength from a chemical which has deliquesced.
though it is usually sufficient to drain off the crystals, or to use
a hydrometer, referring to a table giving the hydrometer readings
in terms of percentage strength.

fd) WTxile some chemicals absorb moisture as above, others
give up their water of crj-stallization to the atmosphere and there-
fore lose their cn.*stalline form and inW to a powder and are then
said to have "efflorescence," the phenomenon being termed "ef-
florensccnce." Some crystals do not contain water and there-
fore cannot effloresce.

A very dry atmosphere is suitable therefore for storing del-
iquescent salts but not for efflorescent salts. The only way to
store chemicals is to isolate them from the air by suitably sealing.

How TO Store Solutions

Stock solutions and developers shor.Id be stored either in larjre

131

MOTION PICTURE PHOTOGRAPHY

bottles, earthenware crocks, wooden vats, or in tanks of resistive
material so arranged that the liquid may be drawn off at the side
and near the bottom.

Large glass bottles and crocks should be 6tted with a right-
angled glass or lead tube passing through a rubber stopper wired
to the bottle, the tube being opened and closed by means of a
pinch cock clamping a short length of rubber tubing.

In case a solution such as pyro has to be stored for a long
time and withdrawn at intervals, an absorption bottle containing
alkaline pyro may be fitted at the intake, which absorbs oxygen
from the air as it enters the bottle after withdrawing part of the
solution.

It is often recommended to pour a layer of refined material ail
on the surface of a solution to protect it from the air, though
this is very messy when the bottle has to be refilled.

A battery of stock solution bottles is shown in Fig. 34 the
bottles being arranged on lead covered shelves under which a
large trough is placed, or, the floor may be so arranged as to
form a sink so tliat in case of accidental breakage no serious
damage is done. This precaution is of special importance in the
case oE hypo solutions which might otherwise flood an entire
building and inoculate the various rooms with hypo dust causing
an epidemic of spots.

1S3

CHArr»ii IX
DEVEI>OPMENT OF THE NEGATIVE

AFTER the picture has been taken, the cameraman delivers
the film to the negative developing department, where it
is developed and fixed in a manner very similar to that
adopted in developing still pictures. Before proceeding with the
development of the entire film, when the exposure and light con-
ditions are unknown, a short piece is cut off and developed in-
dependently, so that the proper treatment may be determined
without endangering the entire reel.

The exposed film is wrapped spirally around a h'ght rectangular
frame or rack, for convenience in handling, and is then dipped
into a tank containing the developing solution. This arrange-
ment enables the operator to agitate the film in the solution and
examine it without danger of injury to the delicate sensitized
surface. After the negative has been developed to the re-
quired density it is placed in the fixing bath of sodium hypo-
sulphite where it remains until all the remaining active silver
salts in the emulsion are dissolved out leaving an image of re-
duced metallic silver which can no longer be affected by the light.

Fixing having been completed, the film is thoroughly washed
in dean water to remove the last traces of hypo. The film is
next dried upon large revolving wooden drums, usually driven
by power. The motion of the drums throws off any small drops
of water that may adhere to the back of the film and keeps a con-
stant stream of warm air moving over the emulsion side.

In some laboratories before drying, the film is given a final
treatment in dilute solution of glycerine and water. A small
percentage of the glycerine remains with the film even after it
has dried and owing to the moisture absorbing properties of the
glycerine enough moisture is retained to keep the film in a soft
and pliable condition. When the glycerine has been lost after a
considerable service, by evaporation or other cause, the film be-
comes brittle and must be given another treatment in the glycerine
bath. This is a precaution that is not needed so much today as
modem film is much more pliable than that used a few years ago
when the glycerine bath was a necessity.

139

MOTION

PICTURE PHOTOGRAPHY

cess with makeshifts io the first instance is to court failure
Many of the utensils employed in the dark room can be fashioned
by any handy man. They may lack finish but so long as they per-
form their work properly, nothing more is necessary.

The following small outfit which has a capacity of little more
than so feet of film will go into a space about 32 by 32 inches by
8 inches thick, including a dozen racks. Figure 5^ shows the
construction of the arms of the rack which are made of some
hard close-grained wood like maple, the pins are made of wt\at is
called dowel-pin stock, small rods of hardwood used by cabinet-
makers to pin the edges of boards together in fine cabinet work.

■27-

)

<}0« 009D 0P04O

cf«« 00 eooo««o

Ib^4'

Hf r.5

They may be obtained from almost any lumber yard or mill. The
ones used in the rack described were 3/16 inch in diameter and
protrude two inches from the rack arm. Two rack arms crossed
make a rack on which a little more than 50 feet of film may be
wound spirally, beginning at the center. They are fastened to-
gether with two screws so that they may be readily taken apart
for greater convenience in transporting.

By a little calculation, if one wished a rack of larger capacity,
a 75 or 100-foot rack may be constructed in the same manner.
A rack of 100 feet capacity is about the limit of this form of
developing apparatus, as anything larger becomes too cumber-
some and the swelling action of the developer causes the film to
loosen and gives trouble, as the film seems bound to stick together.
Still racks of larger capacity have been made with four cross
arms instead of two. This only reduces the trouble to a slight
extent, so that it is not advisable even in the hundred-foot racks,
unless the film is stretched very tightly, for one is apt to exper-

t36

DEVELOPMENT OF THE NEGATIVE

ience trouble from slack strands adhering and stopping the action
of the developer where they stick together.

If tlie maker is an amateur metal worker, he may make ao
apparatus quite a bit more compact by constructing it of square
brass rod stock, with smaller brass pins, which on account of their
size may be set closer together than the wooden dowels.

A developing tray 21 indies square inside measurement and
4 inches deep will accommodate the diagonal cross arms of the
27-inch rack. The trays may be made of wood, but by getting
a sheet metal worker to construct the trays of sheet iron, a

FIs. M

much lighter and more compact nest of trays may be made. A
set of three trays is necessary, one for the developer, one for
the Hypo and one for a washing tray. Each of these in succes-
sion is just enough larger than the one preceding so that they will
nest together for packing.

For those who wish to construct their own trays of wood
Figure j6 shows a wooden developing tray which may be con-
structed of any sort of wood which may be at hand. It is not
advisable to try to make this tray water-tight since the action of
the water and developing fluids will inevitably warp it so that
it would leak too badly to use. Wooden trays are easily rendered
water-proof by lining with rubber cloth or in the case of hypo
and washing trays, with ordinary table oil cloth. Oil cloth cannot
be used in a developing tray unless it is covered with a good coat
of Probus paint, as the alkali in the developer dissolves the water-
proof coating on the oil cloth.

MOTION PICTURE PHOTOGRAPHY

Figure j/ shows a square of rubber cloth cut for lining the de-
veloping tray. Use surgeon's white rubber sheeting, which may
be obtained from any drug store. This rubber doth is impervious
to the action of the developer and by turning the folded comer

f-6"-^

K-

'♦

M'i

I ir 33

•R

Tig. *T

as shown in figure j8, a smooth water-proof joint can easily be
made. Place the cloth inside the tray with the rubber surface
up, spread it smoothly inside and turn the edges over the edge
of the tray, a two-inch overlap being provided for in the diagram.
Fasten lightly with tacks until the cloth is smoothly arranged,
cutting down the comers just far enough to meet the top of the
tray and then fasten permanently by tacking half-round beading

138

DEVELOPMENT OF THE NEGATIVE

along the top edge of the tray, after which the small amount of
cloth protruding may be trimmed off, leaving a neat cloth-lined
tray which is water- and solution-proof. The cut shows a rack
on an empty tray ready for winding on the film.

Metal trays should be painted thoroughly inside with a coating
of ProbuR paint, which is a paint impervious to the action of
either acids or alkalies and which may be obtained from any
dealer in photographic supplies. Sheet-iron is better than gal-
vanized iron or tin as the coating of tin or zinc is liable to peel
ofl after short use and expose the metal underneath to the action
of the solutions.

Fig. 88

If a developer is one not easily oxidized, such as Metol-Hydro-
chonon, it may be used a good number of times by keeping it in
an air-tight glass carboy. Films may be dried upon the racks
after washing but as the pins cause a kinking of the film it is bet-
ter to construct some sort of a drying drum ujxin which the film
may be wound for drying and washing.

One of the most compact outfits for the development of motion
pictures is the Spiral Reel invented and manufactured by R. P.
Slineman of Los Angeles, California. It consists of a metal
spiral with a thread or groove which holds the convolutions of
film in a loose roll, parts of wliich are far enough apart to allow
the developing solutions to act upon the sensitive surface and
yet not close enough for any of the layers of film to stick together.
Two hundred feet of film can be wound upon a spiral twenty-
three inches in diameter and completely immersed in two gallons
of developer.

ISO

MOTION

PICTURE PHOTOGRAPHY

These outfits are nude in three sizes having respective capac-
ities of 50, 100 and 200 feet and consisting oE three round tanks
or trays nesting within one another and having one or more spiral
wheels for holding the film to be developed together with a spindle
upon which the wheel may be revolved and a wire screen turn
table upon wliich the film is placed for winding upon the drying
drum or upon drying racks. For use :

Place reel on stationary winding pin at convenient angle to
film box so that film will slide smoothly into reel. Fasten end
of film in slot in center of reel then revolve reel with left hand,
using the riglit hand against outer edge of film to guide film into
reel. When wound, fasten other end of film to reel with metal
clip. Film should be firmly wound and securely attached with
the clip.

Immerse reel in developer and move rapidly up and down
several times to prevent air-bells. When using Pyro repeat this
movement several times during development.

When development is complete, rinse, fix and wash film while
still on reel. Water and Pyro should not exceed three inches in
depth.

When thoroughly washed, lift reel out of water and drain for a
few seconds. Release ends of film and place reel face down on
screen in about four inches of water by grasping reel through
finger-holds on reverse side. Agitate slightly and raise reel, leav-
ing the film on the screen. Lift screen out of the water, place
on stand with revolving top and wind film on drum to dry. Do
not touch face of film at any lime — always lift the reel by handle
in center.

Don't try to put film in reel when reel is wet.

Don't try to take film from reel except by turning reel upside
down in water.

Don't try to dry the film in the reel.

It is not necessary to use the .screen with 50-foot film lengths^
film may be rolled on core held by fingers.

Exposure

The two greatest problems of both the still and motion photog-
rapher arc correct exposure and correct development. These two
things are shrouded in mystery even to many professionals^

140

DEVELOPMENT OF THE NEGATIVE

■^ — ^ - V — • ^^

they may have learned by rule of thumb how to obtain good pic-
tures but to save their Hves they could not give the reasons for
what they do. Also there arc many false or erroneous ideas prev-
alent about exposure and development. One ot the most, per-
nicious of these false ideas is that an under-exposed negative caa
be "brought up" by special methods of development. Another is
that different times of exposure require different methods of de-
velopment. Tlie truth is that the best development for under-,
correct, and over-exposure is tlie same in each case.

The man who sets out to get a good negative every time will
find that he has much to Icaru about development, and perhaps
quite as much to unlearn. It has always been regarded as the
critical stage in the making of the negative, an intertncdiate state
where wonderful things could be done by those who knew how —
"an art," as Bothamlcy said, "not reducible to a matter of figures."
Hence the usual way of mastering development was to get this or
that famous worker's formulae and method, and on that empirical
foundation build one's own methods by cxiierience. But, as Poor
Richard told us long ago : Experience keeps a dear school. We
are beginning to be wiser. The investigations of Hurler and
Driffield plainly show that "the production of the photograph is
governed by natural laws, and a definite effect must result from
a definite cause. The same cause, under the same conditions,
always produces the same effect. Only by clearly grasping and
working in harmony with these laws can we really become masters
of technical photography." Our first step, then is to seek that
scientific knowledge which is a knowledge of things in their
causes : to know, for instance, the law governing light-action.

Let us begin. When we make a photograph, our purpose is
simple: to secure a record of some object of interest. The posi-
tive, then is the real end of all our photography. The negative
is chiefly valuable or interesting as a means to the end, an inter-
mediate step toward the positive — nothing more. Unless we get
in the positive a record which IruthfuHy describes the object
photographed as the eye saw it, all our negative-making is in
vain.

Many photographs are untruthful in their rendering of tone.
misrepresenting the light and shade of the subject as seen by the
eye. The reason why so many of our photographs fail to satisfy
is here discovered ; they do not give us the natural gradations of

141

MOTION

PICTURE

PHOTOGRAPHY

light and shade which please or interest us in the subject, and
which are essential to the illusion of hie and actuality. Our ap-
preciation of truth in light and shade is not perfectly developed
and we are not quick to recognize errors of tliis sort. Neverthe-
less, the technically good jjhotograph of an object or scene in
nature, which gives us the natural variety of light and shade in
the subject, is invariably recognized with praise; while the bad
pictiu'es are simply passed by as "poor photography." For cor-
rectness of delineation in photography we are dependent on the
lens and its right use. For the truthful representation of light
and shade, we depend on the sensitive film and our use of its
capacity to record liie whole range of tones in the subject from
highest light to deepest dark. In this discussion we leave delinea-
tion and the lens out of the question being wholly concerned with
the other side of the problem: how to secure in the negative a
faithful record of the light and shade effects of our subjects.

The consideration of light and shade, as exhibited in the objects
we photograph, may seem for the moment to be somewhat remote
from development of the negative. It is certainly the last thing
thought of by the average photographer, and, even then, is usually
considered as belonging to the pictorial rather tlian to the tech-
nical side of photography. As will be seen, however, it has a
vital influence for good or evil in negative-making, and there can
be little real success in tcclmique until we grasp its practical im-
portance and learn, like the professional photographer, to regard
our subjects unconsciously as arrangements of light and shade.

To get at the significance of this point of view, let us consider
the light and shade effects of any easily imagined subject simply
as so many light-intensities — ^points reflecting light in varying
degree at different parts of the subject, according to its illumina-
tion. If we mentally arrange these light-intensities in order ac-
cording to their relative brightness or visual luminosity, remem-
bering that in all pleasing transitions from light to dark the light
decreases in geometric rather than arithmetic progression, we
shall get, let us suppose, a scale ranging as follows: 64, 32, 16, 8,
4. 2, I, which expresses a geometric series. On this imaginary
scale the light reflected from the deepest shadow in the subject
will be represented as i, and the higliest light in the subject as 64.
Obviously, if the photograph is to give us a tnithful record of
the subject, it must include a range of tones from light to dark

142

DEVELOP MEX J" OF THE NEGATIVE

in which each tone is truly proportional to the light-intensity (or
light reflected by that part of the subject) which it represents.
in other words, the truthful representation of the light and shade
of the subject demands that the tones or luminosity contrasts in
the positive shall range from light to dark in geometrical progres-
sion, i.e., as 64, 32, 16, 8, 4, 2, i.

For example : let us suppose that we are photographing three
houses — a white one, a gray one and a black one — and that their
light-intcnsJty values (or relative visual luminosities) are, re-
spectively, 5 for the black house, 20 for the gray one, and 80 for
the white one. Here the progression of light-intensities is geo-
metric, viz.. as 1.4:16. The truthful representation of tone in
such a case demands that the relationship between the three
houses in the positive shall be proportional to the relative lumin-
osity of the three houses as seen by the eye — i.e., as 1-4:16.

This applies in every instance. Whenever we see a photograph
wherein the tones are true to nature, we may be sure that
this relationship of proportionality exits. On the other hand,
when we fail to secure this vital relationship between the light-
intensities of the subject and the tones in the positive, our photo-
graphs are necessarily untruthful in their representation of light
and shade. As the gradations of tone in the photograph result
from the opacities in the negative, it is plain that a similar pro-
portionality between light-intensities and opacities must pre-exist
in the negative. Here we have the key to the truthful represen-
tation of light and shade in photgraphy. With this in mind we
can go a step further.

When we expose a film in the camera, the light-intensities at
all parts of the subject begin at once to work a change in the
sensitive film. The amount of work done (or light action) is,
of course, determined by the intensity of the light at the same
part of the subject. Thus, keeping aside for the moment all
thought of the form of the thing photographed, the result of ex-
posure is to impress on the sensitive film a latent range of grada-
tions, distributed throughout the film and forming the latent
picture image. On development, this latent range of gradations
becomes a visible range of gradations, consisting nf metallic silver
deposited in the film by the reducing action of the developer.
This is the negative.

Here we come to the parting of the ways. According to the old-

143

MOTION

PICTURE PHOTOGRAPHY

school theories, success in negative-making depended chiefly on
skill in development— always presupposing an exposure sufficient
to give a developable image. The perfect negative was, of course
the result of correct exposure and normal development. But
the amount of control possible in development — by choice among
developing agents, changes in the constituents of the developer,
or modifications in the method of development — was generally
supposed to be so large that, within wide limits, accuracy in ex-
posure was a minor factor. Hence the widespread belief that a
reasonably good negative could be had even though the exposure
was much under or over the time correct for the subject. Hence
the popularity of this or tliat developing agent or formula for
which great claims were made as possessing peculiar capacities.
The only indispensable condition of success was that one had to
know how to choose the particular developer, how to work the
changes required by variations in exposure, how to adjust, modify
or control the rights and wrongs of exposure by skilful "tinker-
ing" in development. Out of this system came all those innumer-
able fonnulac which bewilder the readers of photographic liter-
ature.

The beginner has little or no chance at such "tinkering" for
success depends wholly on repeated trial and error. Hence the
significant legend over the door of the dealer in photographic
supplies: "We do developing and printing for amateurs." What-
ever the virtues and conveniences of the typical old-school method
— the tentative method of development — and despite its appeal to
the vanity of "private judgment," there can be no doubt that it
is based on an imperfect understanding of the functions of ex-
posure and development

The fallacies of these earlier systems and their lack of a ra-
tional basis is clearly demonstrated by the researches of Messrs.
Hurler and Driffield. The system is not one which can be com-
pressed into an intelligible paragraph, but, inasmuch as it forms
basis of rational methods of development, it receives considera-
tion here.

Briefly, then, that portion of the Hurter and Driffield system
which concerns us Is their investigation of the law governing the
action of light on the sensitive plate, and its bearing on the func-
tions of exposure and development. This investigation was
undertaken by Messrs. Hurter and Driffield, as amateurs in

144

DEVELOPMENT OF THE NEGATIVE

potography, to answer the question which lies at the heart of all
negative-making; What is the law in obedience to which some
photographs are true to nature and others are false? As a result
of their researches, extending over years of work, they came
to the conclusion that the truthful representation of light and
shade in photography demanded a technically perfect negative.

This they define as one in which the opacities of its gradations
are proportional to the light reflected by those parts of the sub-
ject which they represent. This all-important relationship be-
tween the opacities in the negative and the light-intensities in the
subject depends upon the existence of a somewhat different loga-
rithmic relationship between the light-intensity and the amount
of silver deposited in development. The establishment of tliis re-
lationship is, in turn, dependent on correct exposure. It
should be clearly understood, however, that the term "correct
exposure," as here used, does not imply that there is necessarily
one exposure, and one only, which will give us this perfect nega-
tive. As we shall sec later, most of the films used in photography
offer considerable latitude in this respect, so that the necessity
of accuracy in exposure does not confront us with unsur-
inountablc difliculties.

It is important to note that, in speaking of the gradations in
the negative, Hurter and Driffield separate the qualities of density
and opacity as two distinctly different properties. These are
often confused and spoken of as being identical, but this is a
1 mistaken notion. By the density of the gradations in the nega-
I tive is meant the relative quantity of silver deposited per unit
I area in development. By the opacity of the gradations is
I meant the optical property of the deposit to impede the passage
I through it of light. "Transparency" is, of course, the inverse of
^^K opacity, and is measured by that fraction of the original light
^^Pu'hich the deposit transmits. These qualities belonging to the
gradations of the negative, as we have read, have relationship
with each other and to the light-intensities which produce them.
At first sight all this may seem extremely technical and per-
plexing, but let use see how the system was worked out and
many things will be made plain as we go along.

In beginning their investigations, Messrs. Hurter and Driffield
took a thickly coated, slow plate and, using a constant source of
light, made a series of exposures in geometrical progression —

14ff

MOTION

PICTURE

PHOTOGRAPHY

three periods of under-, correct and over-exposure respectively.
The period o£ reversal may be neglected as of little interest in
everyday photography.

Having regard to the "rise" of the individual steps in this
staircase as indicating increase in density, we note that, com-

inC^EUmi'tlSC* CaUAL^ELlSe* Drcll6M|Hft1ltfc»''

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Via. M

mencing at A and proceeding as far as B, the steps are marked
by a gradually increasing rise, but that at the very beginning of
this period this rise is proportional to the exposure or hght-
inlensity. Keeping in view the definition of a perfect negative
as given before, it will be seen that we have here a false relation-
ship. Proportionality exists between exposure and density, in-
stead of between exposure and opacity. A negative, the grada-
tions of which fall within this period, will represent the shadows
and most of llie iialf-lones of the subject by bare glass; while

DEVELOPMENT OF THE KEGATIVR

the high-lights will be marked by relatively extreme density — in
other words, the negative will be under-exposed.

Next we note that from the point B, and extending to C, the
steps in the staircase are all of equal rise ; that is to say, each
doubling of the exposure is represented by an equal increment
of density in the negative. Thus the density grows arithmet-
ically while the exposure progresses geometrically. As the
mathematician calls each term of an arithmetic series the loga-
rithm of the corresponding term of a geometric series, it will be
apparent that any exposure which falls within this period gives
us that logarithmic relationship between densities and light-in-
tensities which is essential to the truthful representation of liglit
and shade. The following ratios will serve as an example of
this relationship.

Light-intensities (exposure) 1:4:16 (geometric progression)

Silver deposited (density) 0:0.6:1.2 (arithmetic progression)

Opacity i 4:16 (geometric progression)
Thus we see that the photographic plate is capable of giving a
range of opacities truly proportional to tlie hght-intcnsities of
our subjects, but only on condition that all its gradations fall
within that portion of the staircase (Pig. ^o) in which the steps
are of equal rise; or, in the case of the "characteristic curve"
within that portion represented by a straight line.

Referring again to the staircase, the period of over-exposure
begins at C and continues till the highest step is reached, when
the period of reversal sets in. In this period, the growth of
density is marked by a gradually decreasing rise in the steps,
which finally becomes imperceptible. A negative, the gradations
of which fall within this period, would be as false in its repre.<icn-
tation of Hght and shade, but in an opposite direction, as if its
gradations fell within the period of under-exposure. Tlie char-
acteristic of under-exposure is too great contrast between the
tones: in the period of over-exposure the contrasts are too small.
The tendency of the gradations in cases of over-exposure is (as
we see in the steps) to approach one uniform density; hence the
Hatness and lack of contrast in over-exposed negatives, in which
the high-lights and half-tones are represented by almost similar
opacities. Obviously, if the negative is to yield a positive true
to nature, it must include no steps in the under- and over-ex-
posure portions of the staircase, but its densities must fall witliin

149

MOTION PICTURE PHOTOGRAPHY

In Fig. 41, we have the characteristic curve of a film the range
of which may be taken as I to 60. Any exposure which will
include the range of fight-intensities in the subject within these
limits will be a correct exposure. As the total density of the
negative increases with the exposure, however, the photographer
will always aim at an exposure which will cause the gradations

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Fig. 41

of his negative to begin at the lowest portion of the straight line
representing the correct period. The best possible negative is,
of course, one which confines truthful representation of the sub-
ject with minimum density ; but, owing to the practical difficulty
of attaining absolute accuracy in exposure with widely different
conditions, we can well content ourselves if we so manage that
we get the gradations of the negative anywhere within the limits
of the period of correct representation. This can usually be
done with the aid of an exposure meter or reliable set of tables.
It should always be remembered, however, that these give the
shortest possible exposures under given conditions, so that expo-
sures slightly in excess of the figures in the tables or indicated by
the meter used will be advisable.

The range of light- intensities reflected by different classes of

subjects is a nutter about which many photographers are poorly
infonned. Messrs. Hurter and Driffield give the range of a
subject including white cardboard in sunlight and black velvet in
shade as i :^o. The latitude of the film shown in fig. 41 for such
a range would be i :3, that is the exposure could vary from i \^,
In interior photography the range will be less, allowing a cor-
respondingly greater latitude in exposure. In portraiture the
range of light-intensities is usually very limited, say i :io, giving
a still greater latitude in exposure without toss of truth in rep-
resentation. Dealing with this Mr. F. Dundas Todd, a portrait
photographer, has made a series of practically identical positives
from negatives including exposures varying as I :i6. This may
be taken as an exceptional instance, a safe range with the aver-
age plate or film being i 4 or i :5.

This must conclude our glance at the Hurter and Driffield
system and its bearing on exposure and development All men-
lion of their advocacy of a numerical system for the expression
of development factors and their methods of determining the
speed and other qualities of plates or films must be omitted, to
give room for the practical application of the principles herein
discussed. The interested student will doubtless refer to the de-
tailed information in more extended treatises on development
which will be foimd listed in the chapter on bibliography.

With this knowledge of the Hurter and Driffield system and its
basis, we can now begin to apply it in practical work. Since ex-
posure is, as we have shown, the prime factor in negative-making,
which determines once and for all its truth or falsity as a record
of the subject photographed, it is plain that development is enor-
mously simplified, being in fact merely a process which reduces
the latent image to metallic silver, the truth or falsity of the
record being determined by the exposure. In the following
method of development worked out by Professor W. H. Wallace,
development is reduced to its simplest terms. It gives us all that
we can obtain by any other method, and at the same time gives
us perfect control over the total range of opacities to be included
in the negative.

This method is based on the principles of time and temperature
development indicated in the Hurter and Driffield system, and
also resembles somewhat the well-known system devised by RJr.
Alfred Watkins, the "time of appearance** being omitted from

MOTION PICTURE PHOTOGRAPHY

consideration. It gives without unnecessary detail, and in the
fewest possible words, a method and formulae which will enable
the beginner as well as the expert worker to get Ihe utmost from
his exposures with the least possible trouble or chance of failure.

It should be noted that as no two brands of emulsion will
work at just the same speed with any given developer, a trial
or two may be necessary to get just the right degree of contrast
with the film used. In this it is only necessary to remember
that the range of opacities (or contrasts) is determined solely
by the duration of development: the higher the factor, the greater
the opacity or contrast. Once the correct contrast factor for a
normal subject has been ascertained, it will not be necessary to
change the factor except for some special purpose or for a dif-
ferent class of subject, according to the preference of the in-
dividual worker. Obviously changes in temperature, the only
condition at all difficult to control in this system, may to a certain
extent be compensated for by slight variations in the length of
development.

For the preparation of the developer the student is referred
to the chapter on How to Prepare Photographic Solutions, and
for development formulae, to the appendix.

As the developing formulae given elsewhere in this book are
not calculated with reference to this table it will be necessary
to do one of two things in order to use the table. The simplest
method is to test the developer with strips cut from a roll cor-
rectly exposed, and, using a small sample of concentrated solu-
tion at 70** Fahrenheit determine the proportion of water to add
to make an average negative in three and one-half minutes de-
velopment time.

When the proportion of water necessary is found — though it
may be more or less in quantity than that given in the formula —
this becomes the standard for use with the table.

The other method is to change the table instead of the de-
veloper. To change the table for your favorite developer make
a test at 70" and note the development time. Suppose it is seven
minutes instead of three and one-half. Then make a new table
in which all the time values are multiplied by two (seven divided
by three and one-half equals two). In a similar manner the
multiplying factor for any other developer may be found by
dividing the development time by three and one-half.

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The tanks and solutions used for developing should be kept
in the same room where the work is to be done, so that they will
all be at approximately the same temperature. Naturally, in this
system uniformity in results depends largely on this factor of
uniform temperature. It is also necessary to observe reason-
able accuracy in making up the developing solutions. If the
thermometer in the dark room hangs dear of its support, and
there has been no recent severe change, the atmospheric tem-
perature may be relied upon, otherwise the solutions should be
tested just before beginning work.

Keep the solutions moving gently during development The
method of using the tables is as follows: Having prepared the
developer and taken care to have the various solutions at ap-
proximately the same temperature, the temperature is first noted.
Now find this degree of temperature in the first column at the
left-hand side of the table and at the intersection of the horizon-
tal line with the vertical line leading to the contrast factor de-
sired, will be found in minutes and seconds the length of time
to develop at this temperature. To illustrate: Suppose we are
using the factor of 6 as giving us the desired range of contrast?;,
and that the temperature is y^^ Fahr. At the intersection of
the lines 73 and 6 will be found the figures 2 and 55, indicating
the time of development as 2 minutes and 55 seconds. Simi-
larly, if the temperature is 68* Fahr. and the factor 5 gives us
the required range of contrasts, at the intersection of the two
lines 68 and 5 will be found the figures 3 and 10, indicating that
the time of development should be 3 minutes and 10 seconds.
This is all we need to know. The film rack is immersed in the
developing solution, agitated from time to time and at the end
of the indicated time is taken out of the developer, rinsed in
the short stop and placed in the fixing solution.

With regard to the choice of the contrast factor among those
given at the head of the table, this must be determined by the
personal preference of the individual as to the general character
of the negative desired. Naturally this preference will be con-
siderably influenced by the amount of contrast in the subject,
this depending on the character of the subject and its illumina-
tion. In a normal subject such as a sunlit landscape, softness
will be gained by choosing a low contrast factor, and crispness
with a decided relief can be secured by the choice of a somewhat

i57

MOTION PICTURE PHOTOGRAPHY

FOG. Fog is sometimes caused by oil, dust or a hazy atmos-
pheric deposit on the lens. 1'his would give a flat hazy image,
which on forced development would produce fog.

A uniform blackening of the film when developed, is due to
fog. There are various kinds of fog and many different ways
in which it may be produced. If fihn is exposed to an unsuit-
able dark room light during process of development, or when
loading into magazines or winding on the racks, it will become
fogged. Actinic light in tlie dark room is a most frequent cause
of trouble and photographers sometimes blame the film when the
difficulty is due to dark room not being Iight-ti|^t, or developing
light not being safe. Too much alkali or too warm developer
will cause fog also. A leaky camera or magazine frequendy
cause fog.

The reversal of values whereby a negative is changed to a
partial positive is not very generally understood. The most fre-
quent cause for reversal of the photographic image is the expo-
sure of the film to an unsafe dark room light during the process
of development. The amount of reversal varies with the relation
between the preliminary and subsequent development and length
of exposure to actinic light after development has begun. Re-
versal occurs only when negative is fogged after being partially
developed. Fog previous to development merely blackens the
film all over.

Other causes for reversal are extreme over-exposure or a
trace of Hypo in the developer. These latter causes are. how-
ever, infrequent. Reversal due to an unsafe dark room light is
quite common and photographers not undersUnding the true
cause, are usually inclined to blame the film.

H.^LATION occurs when strong lights are brought opposite
dense shadows. It is frequently seen in the case of white draper-
ies on a dark background. It occurs also when dark objects arc
pholographcd against a bright sky. When photographing in-
teriors, halation shows as a spreading of the light from the win-
dows. Another cause is reflection of light from the lens by some
bright metal part of the mechanism or of the lens mount. All
the interior meta! parts of the camera, especially those near the
lens and the aperture plate, should have a dull black finish.

THIN AND WEAK NEGATIVES lacking density may be
due to under-exposure, developer used at too low a temperature,

lao

DEVELOPMENT OF THE NEGATIVE

or on account of developer not acting with sufficient energy.
Thin, flat negatives are due also to insufBcient develojwnem. Too
much diffusion of light on the subject will produce flat negatives
also.

The remedy would be to light with more contrast, giving more
roundness and relief, give correct exposure and keep temperature
of developer and dark room at the proper point. If, after having
taken every precaution, negatives arc still weak and lacking in
brilliancy, it is possible tliat better negatives can be obtained by
increasing the proportion of carbonate of soda in the developer.
Impure sodas are responsible for many thin negatives.

FRILLING AND SOFTENING of the f^Im is due to using
developer or other solutions at too high a temperature. This
causes the emulsion to soften and sometimes to lift from the
support. Violent changes in temperature in the various solu-
tions arc liable to cause frilling. Frilling is., however, most
frequently encountered in the summer time or in warm climates.
The use of ice to keep the temperature at the proper point is
recommended. Use fresh Hypo or an Acid Hypo Bath. Do not
wash for too long a time and when dr>*ing. place negatives where
there is a free circulation of air, so as to dry rapidly.

Negatives dried in warm, close atmosphere will increase in
density and clog up the half-tones. The best way to dry nega-
tives is before an electric fan, but under no circumstances should
drying be hastened by the application of heat. Dryini; negatives
in loo warm a place will melt the emulsion, causing same to nm.
giving a grotesque appearance to the image,

GRANULAR IDENTATTONS in the emulsion are due to
slow dr)'ing. H negatives are dried too slowly the gelatine will
swell and separate, causing transparent blotches and spots apd
a pitted appearance all over the surface of the film.

MOTTLED AND WRINKLED FILM is another kind of
frilling. This is due to prolonged development, causing film to
become soft, and then washing in water that is too warm.
Wrinkling or reticulation of the film is most frequently due to
its being left for a long time in solutions of too high a tempera-
ture.

A very common cause of blisters is not thoroughly rinsing
film after removing from the developer and before placing in the
Acid Fixing Bath. The developer being alkaline, transferring

IGl

MOTION

PICTURE PHOTOGRAPHY

the film to an Acid Fixing Balh without sufficiently washing
same, causes effervescence, and the gas forming under llie emul-
sion, litts the iilm and produces innumerable small bhsters all
over the surface of the fihn. The remedy would be to remove
the alkali by rinsing before placing it in the fixing baxh.

Negatives may be stained from a variety of causes. Brown
or yellow stains, causing fUm to become discolored either entire
or in sections, are usually due to imperfect fixing or incomplete
washing after fixing. The use of decomposed Hypo or oxidized
Pyro Developer will cause stains also.

YELLOW EDGE OR DISCOLORATION is frequently due
to insufilcient fixing and sometimes to insufficient washing.

The subject of spots is an endless one, and when this difficulty
occurs it is usually necessary to consider each case individually.
Some of the most frequent causes for spots arc, however, as
follows :

TRANSPARENT SPOTS may be due to an oily substance
on the surface of the film which would repel the developer and
prevent its action.

ROUND TRANSPARENT SPOTS with sharply defined
edges arc due to air bells in the developer which adhere to the
surface of the film. This may occur either in tank or drum de-
velopment.

SMALL SEMI-TRANSPARENT SPOTS occurring in tank
development are usually due to effervescence in the water on
account of high pressure. This causes minute air bells to adhere
to the surface of the film during the preliminary stages of de-
velopment, giving what some consider a mildewed appearance,
but if spots are examined under a microscope, it can readily be
seen that same are due to minute air bells, as above stated. The
remedy would be to draw off sufficient water for developing bath,
allowing same to stand long enough for the air to escape. The
racks should be moved up and down during development to dis-
lodge any bubbles that may form, and the top of the rack gone
over with a large camel's hair brush saturated with developer.

IRREGULAR SHAPED TRANSPARENT SPOTS may be
produced by scum on the surface of the developer. This occurs
when using developer which has been allowed to stand and be-
come oxidized. Irregular transparent spots arc sometiines due
to film having been injured on account of rough handling. In

■

DEVELOPMEXT OF THE NT. GATIVK

this case the emulsion will be found broken and dug throu|;h to
the celluloid.

TRANSPARENT SPOTS AND PITTED EMULSION arc
due to the decomposition of the 6hn, the result of slow dryini;
in a close, heated atmosphere.

Opaque SPOTS WITH TRANSPARENT TAILS are due to
dust on the plate and fogging caused by liglit shining in frnni ■
leak in the capiera or magazine. Particles of lUi^l resting on
the fihn, if shiny or semi -luminous, have the effect of reflecting
and concentrating the light on that portion of plate whicli is im-
mediately in front of or beneath the particles, and then ca-iting
a shadow just behind the grains of dust. This produces the
effect of opaque spots with transparent tails receding from them.

PIT MARKS, causing small transparent spots, may be due
to sulphurous precipitation from the fixing bath. If Ihcrc was
an excess of alum used when making up fixing bath, and solu-
tion was not filtered or decanted off, precipitate would adhere to
the surface of the emulsion and cause irregularity of surface if
film were softened during subsequent washing.

PURPLISH OPAQUE SPOTS may be due to decomponed
pyro or other chemical impurities in the wash water, or from dirty
trays or tanks. Purplish black spots are due to particles of iron
from the supply pipes settling on the surface of the negative.
The remedy would be to filter the water, be sure that trayn are
clean and that no chemical impurity comes in contact with 1h«
surface of the film.

FINGER OR THUMB MARKS on the celluloid side of the
film against which the emulsion side of the next convolution of
film in the roll comes in contact, would cause fpots, pArliruUrly
if there was perspiration or a chemical imjnirity, such M Hypo,
on the hands. These impuritscs would o^Kt on the sensitized
side coating and cause irregular masses of tpotf,

PECUUAR STAR-SHAPED MARKINGS lonietfme* to-
pearing on film haTC been found to be due \o colonies of btcterw.
This has occurred when ncgativct were left in a damp, iti\6
atmosphere when placed on the rack to dry.

OPAQUE STREAKS may be prodnced by rutUnf or rth«r
physical action on the film before devdopifif, Omm mrmk$
are sometunes caosed by rigfitwring or "tkmag Wjf* % roll of
film. H there were any pttticks of docC or Of|Mk Rttttr rttt*

MOTION PICTURE PHOTOGRAPHY

ing between the surfaces, "cincliing up" together would produce
an opaque marking.

SEMl-TKANSPARENT STREAKS with sharply defined
edges are due to not pouring developer over the entire surface of
the film when developing in the tray.

TRANSPARENT MOTTLING is due to negative having par-
tially studc to the celluloid side of another turn of film during
washing, and when pulling apart caused the emulsion to par-
tially Hft.

SMALL, SHARPLY DEFINED OPAQUE SPOTS have
been caused in the dark room when allowing water to run from
the faucet. The surface of the film became spattered either with
clear water or by impurities from the bottom of the sink, and
was afterward dried while awaiting development. This causes
spots var)'ing in size, character and intensity.

Numerous parallel vertical lines are produced by using decom-
posed pyro developer and acid in an old fixing bath, cutting the
pyro stains out in streaks when precipitating. The remedy would
be to use fresh developer and a new acid hypo bath.

Chapter X
MAKING MOTION PICTURE POSITIVES

HAVING described tlic methods of making the negative
record picture in the motion picture camera, wc come
now to the processes involved in making the positive
print. Many persons, who have not given any thoiigiu to the
matter, have an idea that the film which comes from tlic camera
is the same film which is run through the projection machine.
If one stops to think for a moment, however, he will readily see
that the developed film from the camera is a negative, and while
it is possible to run it through a projection machine for examina-
tion, it has a peculiar appearance on the screen, showing liglit
objects as black and black objects as white.

In order to show the proper relation of light values, it is neces-
sary to make a print from this negative just as it is necessary to
m^e a paper print or positive from a kodak negative. It is
generally desirable also to make a number of duplicate copies
from a single negative, so that the same picture may be shown at
the same time in various places.

There are methods of making a positive direct in the camera,
but these methods are only practical in certain isolated instances,
which will be described more fully in another portion of this
book.

Printing from a motion picture negative is not as simple a
process as printing from a still picture negative, since the exact
relation of distance of one picture to another must be preserved
throughout the many feet of film. Most cameramen will not
have the time or the inclination to make prints from their own
films, but it is ver)- desirable that the camera operator be con-
versant with all of the processes of finishing.

Since motion pictures are shown in a projection machine by
means of light projected through the picture, it is necessary that
the prints be made upon transparent film instead of upon paper
as is the ordinary print. To make these prints as accurately as
is required, a printing machine is necessary. There are quite a
number of different machines for this purpose, all of wtticb are

MOTION

PICTURE PHOTOGRAPHY

constructed on the same general principle. They may, however,
be classified under the two general heads:

Step printers and Continuous printers.

The mechanism of the step printer is essentially the same as
the mechanism of the camera, except that instead of the lens, it
has a light-proof box containing a printing light for impressing
the negative image upon the positive, the negative and positive
film being fed through the gate at the same time. The negative
and positive films are placed in rolls upon spools or spindles
above the gate and arc fed down by means of a tooth sprocket
which engages the perforations. The negative film is placed
nearer the light with the emulsion side away from tlie light and
the positive film with the emulsion toward the liglit, so that the
two emulsion surfaces come in contact face to face. A loop is
left between the gate and the feed sprocket as in tlie camera —
the positive film having a slightly larger loop than the negative
so as not to interfere with it as the films are drawn down in
contact. A pair of pins or claws draw the two films down to
go into the gate and pass the aperture through which the print-
ing light shines. As in the camera, a shutter cuts off the print-
ing light during the time that the film is being drawn down and
then opens and permits the printing light to impress the negative
image upon the sensitive positive film.

There are several reasons for this. We are not always able
to control the amount of light which we need for taking a pic-
ture, but in the printing machine we have a light which we can
make any desired strength.

We can impress the image from the negative upon the positive
emulsion easily and quickly without having it nearly so sensitive
as the negative stock so can use much stronger red light in our
printing and positive developing room. Therefore positive stock
is handled with much greater ease and certainty and by employees
of less skill and training than is required for negative. The less
sensitive positive stock is also much less liable to fog and gives
a much clearer and more transparent print than would be pos-
sible upon the more sensitive negative emulsion.

A printing machine is run much slower than a camera. The
printing rate has nothing to do with the rate with which "the
positive film is run through the projection machine, so gives time
to conduct the operation of printing carefully and with due re-

gard for the preservation of the precious negative film which
may have cost large sums to produce.

The operation of printing machines is conducted in a photo-
graphic dark room where many of these machines may be in
operation at the same time. The pressure plate over the print-
ing aperture is generally made of ruby glass, so that the opera-
tion of printing may be inspected while it is going on without
allowing any of the actinic light from the printing lamp to pene-
trate into the dark room. In most cameras, the pressure plate
on the gate is held in continuous tension against the film by means
of springs, but this cannot be done in a printing nuchine, as the
continuous friction of the pressure plate upon the negative, after
it had been run for a number of prints would surely scratdi and
scar the negative, and these imperfections would in turn be
printed upon the positive film. For this reason, a mechanism is
provided in the printing machine for releasing the tension upon
the pressure plate while the film is being drawn down, but which
allows the pressure plate to come back into contact during the
lime of the printing ; that is, during the time that the film is at
rest. This is done to insure perfect contact between the negative
and positive film, otherwise, if they were not in perfect contact,
the light from the printing lamp after passing through the nega-
tive would be diffused before it reached the positive and would
not produce a perfectly sharp clear picture upon the positive
emulsion.

The two films after passing through the printing gate, again
form two loops and pass over the teeth of the take-up sprocket,
and are wound upon two separate take-up rollers. The negative
film is re-wound for passing again through the printer and the
printed positive is sent to the positive developing room for de-
velopment.

As the tension of the take-up on the negative film has a ten-
dency to produce wear and abrasion, especially when dust or
dirt settle upon the film, it is a common practice in some labora-
tories to dispense with the negative take-up and feed the nega-
tive film as it comes from the printer into a cloth-lined box or
bag, from which it is carefully re-wound by hand. In other
places, both take-ups are dispensed with and the positive film is
also run into a separate receptacle before being wound up for
transmission to the positive developing room.

167

MOTION PICTURE PHOTOGRAPHY

Step printers arc commonly operated at a speed of from three
to four frames per second, which is as fast as is consistent with
high-grade work. Tlie steadiest positives are produced by step
printers as the claws draw the film down exactly the same dis-
tance each time. Step printers are especially valuable where
some slight diiference exists between the perforations upon ihc
positive and the negative film, since any slight difference is being
constantly compensated for l>etwecn tlie printing of each frame.

Take a concrete example:

»Ve might have a piece of negative film which had so shrunk
during the process of development that there were sixty-five per-
forations per lineal foot, whereas the undeveloped positive which
might have been perforated upon the same machine contains
sixty-four perforations to the foot. Tlie claws of the printing
machine would still enter every fourth perforation of both the
positive and negative, and as each frame was printed the positive
film would be drawn down one-sixty-fiflh of the distance between
two perforations further than the negative film. In other words,
64 feet of negative film would be printed ii|)on 65 feet of positive
film and yet each piece of film would have the same number of
pictures and the same number of perforations, and the pictures
upon both films would be equi-distant from one another, and
each frame would have been in perfect contact while being
printed.

Continuous ^>rlntcrs dn not have pins or claws to pull the film
down one picture at a time, but the two films are fed past a slit
at a steady even speed by means of a sprocket. It can readily be
understood that unless the negative and positive in a continuous
printer have exactly the same number of perforations per foot
that there will be a small but constant shift between the surfaces
of the two films causing a slight blurr in the film.

As negatives are of different densities and printing machines
run at a uniform speed, it is necessary to have some means of
changing the strength of the light to correspond with the density
of the negative and give an even positive print. There are dif-
ferent methods of accomplishing this in different printing ma-
chines.

The methods are as follows ;

The first is by varying the distance of the light from the
printing aperture, which is accomplished from outside the lamp
bouse by some mechanical device.

168

flNG MOTION PICTURE POSITIVES

The second is by varying the strength oi the electric current
supplying the printing lamp. This is done by a rheostat, or
variable resistance placed in scries of the lamp circuit.

A third way is by varying the arc of exposure opening in the
shutter.

A fourth is by means of a condensing lens placed between the
lamp and the printing aperture and moving the lens system in-
stead of the lamp. This permits of a smaller lamp house than
the first method of moving a lamp, as a very small movement of
the condensing lens will produce the same amount of change as
moving the lamp for a considerable distance.

A fifth way is one which can only be used in the continuous
printer. It is varying the width of the slot past which the film
jiasses as it is printed.

When a new negative comes in to be printed, it is necessary
to find just what strength of light is needed to print each kciw.
In large laboratories, this work is in charge of a man called a
timer. Some of these timers become so expert through long ex-
perience that by mere inspection of a negative, looking at it
toward a light covered with a groimd glass, they can tell exactly
how to set the printing lamp to produce a good positive. Some
of them have a test chart which consists of negatives of all dif-
ferent densities mounted upon a sheet of ground or opal glass,
and comparing these known samples with the negative brought in,
can ascertain the correct printing time. "Correct printing time"
is the term used, although it is not accurate as all of the machines
in a factory run at the same speed or time. What it really means
U tiK strength of the printing light

None of these methods, however, can be absolutely acctirate.
An almost imperceptible change in the color of the negative de-
posit will need quite a different priming I igfit from that of anothn
negative of the same apparent density, but of slightly differcot
color.

These roetl»ods. however, work very well in places which do
all of their own devek^ng where the negatives are apt to be of
unifonn color.

In umuuerdal laboraiories. uegJtii'ta are developed under
many different coadstions with many different formulae and with
deposits of Jiffciem cokrs. A brownish pyro-developed nefi-
tive. or one derdoped in an oM detcfapcr which has lefft a aSglK

MOTION PICTURE PHOTOGRAPHV

brownish or yellowish stain, requires a considerably stronger light
than a blue-black negative developed say — in a fresh metol hydro-
quinonine bath.

If the timer is in doubt as to the exact strength of light to use,
he prints a test film about a foot long, using a range of lights
from stronger to weaker than the one he judges will be correct.
He then develops this test strip and determines from it the exact
strength of light to use. Most printers are now equipped with
what is called an automatic light change ; that is. a mechanical or
electrical device for automatically changing the light for each
scene.

The automatic light change is actuated by an electrical con-
tact on the machine which bears upon the edge of the negative
film. By means of a special punch, a very slight nick or indenta-
tion is made in the edge of the negative film where a light change
occurs. A small wheel connected with a delicate electric switch
bears upon the edge of the film. As long as the negative film has
no indentation upon its edge the light strength remains the same.
When a light change is to occur, the small wheel depresses itself
into the indentation by means of a spring and closes the electric
circuit causing the light shift to advance one step. At each step
the liglit will be shifted according to a hole punched in a control
card. Each of these control cards has enough steps to shift the
light for all of the different scenes which might occur in a two
hundred foot roll of negative.

As the developing racks hold approximately two hundred feet
of film, negatives to be printed are joined as nearly as possible
to produce rolls of about two hundred fcot. These control cards
are punched by the timer or head printer so that each successive
scene will be printed by the proper strength light.

On each roll of negative to be printed, a piece of leader is
cemented, marked in india ink with the numbers or other identi-
fication marks showing what is contained in the roll, also marks
showing the frame line, so that the printing may be started in
correct register.

Negatives taken with different cameras often have different
frame lines, that is, the line separating the frame in one film oc-
curs in a different relation to the perforation on the edge, than
it does in others. Printing machines are equipped with a fram-
ing device ; that is, the distance between the claws and the print-

170

MAKING MOTION PICTURE POSITIVES

ing frame may be altered so that each frame comes in exact
register with the printing aperture. 1 his framing must be done
In all step printers, otherwise the line between the printed frames
would come across ihc picture in the frame. The identification
marks upon the negative leader are thus printed upon the ends
of the positive film and remain there for its identification until
it is ready to be assembled into a reel The control card for each
negative roll is marked with the same identification number as
that on the negative roll and is filed away with it, or in a card-
index drawer where it can be found readily when more prints arc
to be made from that negative. As seventy-five to one hundred
duplicate prints are frequently made from an original negative
and reprints may be called for at any time, it will be seen that
such a system is very important and necessary.

Of the two types of printing machines just referred to the ones
most used in this country are the Duplex, a step printer, and the
Bell and Howell, a continuous printer. Since they are repre-
sentative of designs of these types and most commonly met with
in film laboratories, brief directions for their use are appended
to the chapter.

OPERATION OF THE DUPLEX PRINTER

The threading is simple. The positive stock is placed on the
front disc and the negative on the rear disc. The ends of both
films are led under a roller above the feed sprocket then over
the feed sprocket and under the tension roller which maintains
the film in position on the sprocket. A four-inch loop is left in
the negative strip and a five-inch loop in the positive strip, the
latter being nearer the operator. The difference in loop size is
to prevent scratching from friction of one surface upon the other.

The films next pass through the tension box which is a continua-
tion of the aperture plate and is located just above the gate. A
spring contact attached to the track at one side of the tension
box bears against the edge of the negative as it passes this point
and serves to operate the light-changing mechanism by making
contact through notches cut into the film near points where
changes of scene occur. The widih of the film track in the ten-
sion box is adjustable, thus making it possible to operate the
light-changing device even though the negative be considerably
shrunken.

MOTION PICTURE PHOTOGRAPHY

After passing through the aperture ptate another pair of loops
arc formed, this time the positive being four inches and the nega<
live 6ve inches. The films after being passed under the tension
rollers adjacent to each sprocket are nm over the sprockets and
then attached to the take-up spindles.

A highly perfected type of "automatic" now accomplishes the
work of altering the printing light to suit the densities of the
various scenes of the negatives being printed.

The light-changing movement consists of an accurate escape-
ment which is operated by an electro-magnet very accurately
wound so as to operate the escapement instantaneously when a
contact is made at the breaker-box. The intensity of the printing
light is controlled by a light bar which is so ofwrated that it
comes successively into contact with a series of plugs on the
front of the automatic corresponding to the various scenes on
the negative strip. Each of these contacts puts the requisite
amount of resistance in scries with the printer light, and it U
thus that the printing intensities are governed. This automatic
has a capacity of i8 different light intensities and will also change
the light for i8 successive scenes at one sitting.

When the proper printing intensities have been ascertained
for each scene of a given roll of negative, a card is punched with
a scries of holes corresponding to these light values. The card
is then mounted on the front face of the automatic and plugs are
inserted through the holes in the card, which is only used as a
guide to the insertion of the bronze plugs, and may be remojved
before printing is commenced.

With the older types, the light-bar was in contact all the way
across the front of the contact panel, but with the present model
only one of the contact buttons on the inner side of the light-bar
is in contact with one contact plug at any time;. This allows the
bar to drop so easily, when the automatic is operated, that a
greater pressure can be supplied to its buttons, which assures
excellent contact between them and the phigs through which the
light changes are accomplished, and also eliminates any possibility
of arcing when the light-bar drops from one position to the next.
Electric current is supplied to the macrnel which operates the
escapement and light-bar of the automatic by the starting clutch
of the printer, and is cut off. when the printer is stopped, through
the medium of a switch which operates in unison with the clutch

173

handle. H the machine is run without a negative fihn in place,
the breaker-box will supply a continuous current to the magnet
which might cause it to bum out, but this is avoided by discon-
necting the flexible wire cord and plug through which the current
reaches the automatic. The current is cut ofif from the printing
lamps when the light-bar is opened for the insertion of the card
and the contact plugs, while the current is in turn cut off from
the light-bar by opening the switch shown at the bottom of each
automalic. If the current is left flowing through the light-bar
a shock can be sustained if the hands of the operator come into
contact with it when arranging the contact plugs. In former
models the light-bar was exclusively shifted by electricity through
the medium of the contact in the breaker-box above the machine
gate, but the perfected escapement of the new automatic ter-
minates in a handle at the top by which the light-bar can be
raised or lowered by hand to any desired position.

A film-notching device supphed with the printer is used to cut
notches in the edge of the film at any point where a change in
the printing light is required. This notching de>*ice is provided
with a gauge which indicates the exact point at which the film
should be notched, in order that the change of light shall occur
exactly at the dividing line between scenes, and the rapidity with
which the new automatic operates, insures freedom from long
sections of improper density following changes of scene in the
finished prints.

OPERATION OF THE BELL AND HOWELL PRINTER

The essential factors necessary to the effectual realization of
the continuous printing are :

First — Ability to maintain correct registration on the unde-
veloped positive stock, regardless of age or amount of shrinkage
of the negative.

Second — A movement that will facilitate the continuous pas-
sage of the films over the light aperture without undue friction
or abrasion.

Third — The flexibility of the volume of light used for printing
scenes of different density and the rapidity of the changes from
one intensity to another.

Fourth — The speed of operation or the actual capacity per
working day, which is the most striking feature of this machine
in comparison with other types.

173

MOTION

PICTURE

PHOTOGRAPHY

Referring to the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undeveloped films it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter-balanced by the decreased length
of its arc over that of the positive. The perforations arc there-
fore made to coincide and all crccpage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that guide rails along
the film path arc absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to bring about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widtji so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slightly smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforations of
the positive are held directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
tire length of the films by the sprocket teeth.

In taking up the second clause relative to a film movement
permitting a constant pressure to hold the films in proper con-
tact at the instant of exposure, it is obvious that any device with
such a small area bearing on the continuous moving film, and
of a sufficient tension to insure perfect contact, would produce
the much loved enemy of the producer, namely scratches. There-
fore, some means had to be evolved to overcome this difficulty,
and the only available solution was to recess the aperture shuttle

174

MAKING MOTIOK PICTURE POSITIVES

segment a point of contact with film and also to ust, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By use in the light chamber, of a constant pressure of air
whose only means of exit is through the exposing aperture and
against the negative holding it in perfect contact with the posi-
tive, the question of scratches was cniircly eliminated.

By careful consideration of the lliird problem mentioned rela-
tive to the varying strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp greatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that vcrj* little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two iwints and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
point No. I. the aperture is set for the smallest opening or an
exposure by a strip of light ^^ inch wide reaching across the film.
Each consecutive ixtint from No. i up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically affected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position.

The light changes arc accompanied by an audible signal in-

MOTION

PICTURE

PHOTOGRAPHY

Referring lo the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undeveloped films it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter -balanced by the decreased length
of its arc over that of the positive. The perforations are there-
fore made to coincide and aJl creepage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that guide rails along
the film path are absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to brinp about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an incli smaller in widt^ so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slightly smaller in width in order to
compensate for lateral shrinkage. Thus it wilt be seen that when
two films are superimposed on this sprocket the perforations of
the positive are he!d directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
tire lengtli of the films by the sprocket tectK

174

.^m

segment a point of contact with film and also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By careful consideration of the third problem mentioned rela-
tive to the varying strengths of light, needed for consecutive
scenes of difTcrcnt densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a sh'ght decrease in the current supplied
to the lamp greatly changes the quality of tlie light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two -points and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
point No. I. the aperture is set for the smallest opening or an
exposure by a strip of light % inch wide reaching across the film
Each consecutive point from \o. i up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically affected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position. ^
The light cliangcs axe accompanied by an audible signal in-

175

MOTION

PlCTURfc. PHOTOGRAPHY

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that guide rails along
the film path arc absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to bring about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widtji so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slightly smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforations of
the positive are held directly over and made to coincide wrth
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
tire length of the films by the sprocket teeth.

174

.^m

MAKING MOTION PICTURE POSITIVES

segment a point of contact with film an<I also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By use in the light chamber, oi a constant pressure o£ air
whose only means of exit is through the exposing aperture and
against the negative holding it in perfect contact with the posi-
tive, the question of scratches was entirely eliminated.

By careful consideration of the third problem mentioned rela-
tive to the varying strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp gjrcatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two points and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
point No. I. the aperture is set for the smallest opening or an
exposure by a strip of light % inch wide reaching across the film
Each consecutive point from No. I up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically affected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position.
The light changes are accompanied by ai] audible signal in-

ITfi

MOTION

PICTURE

PHOTOGRAPHY

Referring to the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undeveloped films it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter-balanced by the decreased length
of its arc over that of the positive. The perforations are there-
fore made to coincide and all creepage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of tlie negative. It is obvious that guide rails along
the film path are absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to brinp about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widtji so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slightly smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforations of
the positive are held directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
tire length of the films by the sprocket teeth.

In tak-ing up the second clause relative to a film movement
permitting a constant pressure to hold the films in proper con-
tact at the instant of exposure, it is obvious that any device with
such a small area bearing on the continuous moving film, and
of a sufficient tension to insure perfect contact, would produce
the much loved enemy of the producer, namely scratches. There-
fore, some means had to be evolved to overcome this difficulty,
and the only available solution was to recess the aperture shuttle

174

MAKING MOTION PICTURE POSITIVES

segment a point of contact with film and also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By careful consideration of the third problem mentioned rela-
tive to tiae varj-ing strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp greatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by iiu:reasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two points and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
p<Mnt No. I, the aperture is set for the smallest opening or an
exposure by a strip of light yi inch wide reaching across the film.
Each consecutive point from No. i up. gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically afifected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position.
The Ught changes arc accompanied by an audible signal in-

175

MOTION

PICTURE PHOTOGRAPHY

Referring to the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undeveloped fihiis it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter-balanced by the decreased length
of its arc over that of the positive. The perforations are there-
fore made to coincide and all creepage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that guide rails along
the film path are absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to brinp about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widtji so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film arc slightly smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforutioos of
the positive are held directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
tire length of the films by the sprocket teeth.

174

MAKING MOTION PICTURE POSITIVES

segment a point of contact with film and also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By use in the light chamber, oC a constant pressure of air
whose only means of exit is through the exposing aperture and
against the negative holding it in perfect contact with the posi-
tive, the question of scratches was entirely eliminated.

By careful consideration of the tliird problem mentioned rela-
tive to ihe varying strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp greatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two points and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
point No. I, the aperture is set for the smallest opening or an
exposure by a strip of light ^ inch wide reaching across the film.
Each consecutive point from No. i up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically aflrected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position.

The light cliangcs are accompanied by an audible signal in-

175

MOTION PICTURE PHOTOGRAPHY

Referring to the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undevdoped films it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter-balanced by the decreased length
of its arc over that of the positive. The perforations are there-
fore made to coincide and all creepage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that guide rails along
the film path are absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to bring about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side arc
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widiji so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slighdy smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforations of
the positive are held directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the si>rocket holes along one margin of the en-
tire length of the films by the sprocket teeth.

In taking up the second clause relative to a film movement
pemutting a constant pressure to hold the films in proper con-
tact at the instant of exposure, it is obvious that any device with
such a small area bearing on the continuous moving film, and
of a suflficient tension to insure perfect contact, would produce
the much loved enemy of the producer, namely scratches. There-
fore, some means had to be evolved to overcome this difficulty,
and the only available solution was to recess the aperture shuttle

274

MAKING MOTION PICTURE POSITIVES

segment, a point of contact with 61m and also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By careful consideration of the third problem mentioned rela-
tive to the varying strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp greatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing Ihe actual width of the exposing
aperture similar to a focal plane shutter, which is the equivalent
to varying the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is calibrated
into twenty-two points and controlled by an index hand and dial
iDounted on the front of the machine. By placing the hand on
point No. I, the aperture is set for the smallest opening or an
exposure by a strip of light % inch wide reaching across the film-
Each consecutive point from No. i up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
salting the original test pieces made of each scene"), the actual
change of aperture opening is automatically affected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turti shifts the
movable element of the aperture to the desired position.
The light cliangca are accompanied by an audible signal in-

173

MOTION PtCTURfc PHOTOGRAPHY

Referring to the first problem relative to correct registration
of the films regardless of shrinkage due to development: In
order to bring the sprocket holes of the negative and positive
stock in proper alignment and to offset the difference in length of
the developed and undeveloped films it was necessary to construct
the path followed by the two films past the exposing aperture to
conform to the arc of a circle whose diameter is such that when
the positive and negative are in position upon it, with the unde-
veloped or positive on the outside, the shorter length of the
shrunken negative is counter-balanced by the decreased length
of its arc over that of the positive. The perforations are there-
fore made to coincide and all creepage due to longitudinal shrink-
age is overcome.

Now to take up the matter of lateral shrinkage or the shrink-
age in width of the negative. It is obvious that g^ide rails along
the film path are absolutely useless as the width of the positive
film keeps these rails from bringing pressure to bear on both
margins of the negative and hold it parallel with the positive
stock. Therefore, some means had to be devised to brinp about
this condition without contact with the moving film other than
through the medium of the driving sprocket teeth. With this
end in view a sprocket was designed whose teeth on one side are
built to conform with the standard perforation hole, being less
than two thousandths of an inch smaller in widt^ so as to com-
pletely occupy the opening, while the teeth that engage with the
other margin of the film are slightly smaller in width in order to
compensate for lateral shrinkage. Thus it will be seen that when
two films are superimposed on this sprocket the perforations of
the positive are held directly over and made to coincide with
those of the negative, side movement being eliminated by the
absolute filling of the sprocket holes along one margin of the en-
lire length of the films by the sprocket teeth.

174

MAKIXG MOTION PICTURE POSITIVES

segment a point of contact with film and also to use, virtually, a
cushion of compressed air, which was previously strained through
silk mesh to remove dust particles.

By use in the light cliamher, of a constant pressure of air
whose only means of exit is through the exposing aperture and
against the negative holding it in perfect contact with the posi-
tive, the question of scratches was entirely eliminated.

By careful consideration of the third problem mentioned rela-
tive to the var>'ing strengths of light needed for consecutive
scenes of different densities, it was found impractical to use an
electrical resistance to diminish or increase the volume of light,
owing to the fact that a slight decrease in the current supplied
to the lamp greatly changes the quality of the light rays ema-
nated, namely, from one of a pure white on full voltage to one
consisting mostly of yellow rays on inserting a resistance. It
is seen that very little latitude is available by using this method
of changing and one of a mechanical nature had to be adopted
instead of electrically controlled. Practical results were ob-
tained by maintaining a constant radiation from the lamp and
by increasing or decreasing the actual width of the exposing
aperture similar to a focal plane shutter, wliich is the equivalent
to var>'ing the length of the exposure rather than the intensity
of the light used.

In the printer in question, one side of the light aperture is
composed of a revolving segment whose movement is caHbrated
into twenty-two points and controlled by an index hand and dial
mounted on the front of the machine. By placing the hand on
point No. I. the aperture is set for the smallest opening or an
exposure by a strip of light J^ inch wide reaching across the film
Each consecutive point from No. i up, gives a ten per cent in-
crease in exposure over the preceding one, consequently the wide
latitude available for negatives of varying densities that this ar-
rangement permits is very apparent. After setting the index
hand at the desired light intensity (previously ascertained by con-
sulting the original test pieces made of each scene), the actual
change of aperture opening is automatically affected by means of
a radial notch in the margin of the film between scenes allowing
an electrical circuit to be completed which in turn shifts the
movable element of the aperture to the desired position.

The Ughl chaugcs are accompanied by an audible signal in-

17S

TVrOTION PICTURE PHOTOGRAPHY

corporatcd in the mechanism, thus permitting the operator to
properly follow the various scene changes listed on a card and
placed on the machine for this purpose.

The advantage covered by the fourth clause referring to speed
of operations, is maintained by constructing and adjusting the
different controls that each can properly perform its duty at a
rate of speed of approximately one foot per second of printed
positive film or for an average eight-hour day with due allowance
for changes, rellircading and other adjustments, twenty-two
thousand feet, whidi is the noimal rate of speed and in no way
exceptional.

The operation of the machine is controlled by a combination
switch handle and valve whose movement is limited to 54 oi a
revolution and in making development tests it is easy to start and
stop the machine quickly enough to allow of only a few images to
be printed of each scene.

The air compressor is supplied in two sizes, the smaller being
buih to accommodate from one to three machines and the larger
from one to twelve machines. The compressors supply a con-
stant stream of air which is filtered through a silk bag mounted
on a metal frame and attached directly to the intake pipe. The
machines now being furnished require no auxiliary electrical
equipment, ail local circuits being operated from one source of
supply.

Chapter XI

TINTING AND TONING MOTION PICTURE FILMS

Based on the methods worked out by the Eastman Kodak
Research Laboratories

MANY practical methods have been worked out from time
to time for the toning of lantern slides and photographic
papers. When these are applied to the toning of motion
picture film, the toned film obtained in most cases although ap-
parently satisfactory when viewed in the hand, appears sui)-
siantially black on projection. Generally speaking, the color of
the image as seen in the hand is no criterion whatever of its ap-
pearance on the screen, so that in judging any particular lone it
is essential to view the projected image.

The importance of producing toned images of the maximum
degree of transparency is therefore at once apparent. The ex-
cellence of any formula may be estimated by its capacity for
producing a transparent image which on projection shall retain
the necessary- vigor and snap.

While other methods have been suggested for producing a
colored image, the method almost universally employed is to
replace the silver by a colored metallic compound — usually a
ferrocyanidc of a metal of which.

Iron (ferric) ferrocyanidc is blue
Copper ferrocyanidc is red
Uranium ferrocyanidc is reddish brown
Vanadium ferrocyanidc is greenish yellow.
Silver Sulphide ferrocyanidc is warm brown.
The object in toning is to replace the metallic silver compos-
ing the image by one of the above compounds, or by a mixture
of the same whereby intermediate tones are obtained. This
toning may be effected either by a two-solution process or by a
single -solution process.

The two-solution process consists of first converting the silver
image into silver ferrocyanidc by means of a suitable bleaching
bath, thoroughly washing and acting upon the ferrocyanidc image

177

MOTION PICTURE PHOTOGRAPHY

with a metallic salt, usually in presence of an acid. Thus the
metallic ferrocyanide is produced by double decomposition. The
reaction, however, is never complete, so that the image is mixed
with undecoraposed silver ferrocyanide which tends to add "body"
to the latter. If allowance is made in the original positive for
this intensification, good tones are obtained.

Single-soUition process: Instead of the two separate baths used
above, a single solution may be employed consisting usually of
the metallic ferrocyanide dissolved in a suitable solvent (say an
allcali salt of citric, tartaric, or oxalic acids) in presence of an
acid and certain other salts.

On immersion of the positive fihn in this solution the silver
image is converted to silver ferrocyanide, whilst the colored
ferrocyanide is formed simultaneously and in its proper place.

In view of the fact that the metallic ferrocyanide is deposited
in a colloidal condition in presence of the gelatine of the film, its
state of division, and therefore the nature of the tone, is usually
affected by the presence of certain salts, changes of temperature,
concentration of the baths and other factors which must be main-
tained constant in order to produce uniform results. With such
single baths it is possible to secure tones which are unobtainable
by a two-solution process. As these single solutions are sensitive
to light and rapidly attack foreign metals, such as faucets, they
are comparatively unstable and require care in their use.

Two-solution methods are reliable, economical, and are not
so prone to influence of disturbing factors. The total time re-
quired for toning, however, is invariably double that taken up
by a single-solution process, so that, from an economic stand-
point, two-snhition methods are especially recommended for the
worker who tones occasionally.

In the above case if the toned image be treated with acid hvpo
to remove the opaque silver ferrocyanide, an almost pure colored
image remains. The intensity of the toned image is. however,
considerably diminished and. previous to toning due allowance
must be made in choosing the positive in order that the final image
shall be of the correct density for projection.

Since most toning processes either intensify or reduce the
original image, it is most important to commence toning with
positive film of the correct density, so as to obtain uniform
results.

t7«

TINTING AND TONING MOTION PICTURE FIUIS

Any good met ol-hydroqui none formula will produce good
tones, although a straight hydroquinone developer will produce
excellent tones in all cases except with certain vanadium and
iron formulas for green tones. A metol-hydroquinone developer
is essential in these cases in order that the rich olive-green color
may be obtained, and the proportion of metol in the developer
should be about twice the usual quantity.

Before toning it is necessary that the developed film should be
entirely free from fog» since a thin veil becomes intensifie<! in
most of the toning processes. Fog may be caused by :

(a) Oxidization of the developer, noticeable by the brown
coloration produced after continued use. The remedy is obvious.
Do not use exhausted or badly oxidized developer.

(b) Carelessness in compounding the developer. The usual
mistake consists in adding the carbonate to the metol and hydro-
quinone without previously adding some sulphite in order to pre-
vent oxidation. It is not advisable, however, to add the whole
of the sulphite to the metol and hydroquinone in the first place,
otherwise the metol may precipitate.

(c) The presence of metals such as copper, brass and tin, and
fumes from sodium sulphide, etc., in the developing baths are
to be strictly avoided. A salt of copper if present only to the
extent of one part in I0,ooo will produce fog immediately on
cine positive film.

It is advisable that all metallic parts such as pins on develop-
ing racks, etc., should be enamelled or replaced with hard rubber,
or silver plated, in order to eliminate any source of danger.

Exposure and development are of great importance. In such
a case as sulphide or copper toning, the best results can be ob-
tained only on full development.

Fixing should be complete and. if possible, carried out in two
consecutive baths followed by thorough washing, otherwise un-
even coloring will result.

The toned deposits obtained by the processes recommended are
as transparent as is consistent with "pluckiness," and only those
formulae have been recommended which by virtue of their rapid-
ity of action, long life, and cheapness, can be employed com-
mercially.

Pemianrncy of the tone produced in every case depends largely
on the thoroughness and care exercised during the various chemi-
cal operations,

i7g

MOTION PICT

rtOTOGRAPH

The silver sulphide image may be considered permanent, and
likewise the blue tones in those casis where the film is finally
fixed after toning. In the other cases, however, where more or
less silver fcrrocyanide still remains in the toned image, the film
is not absolutely permanent (blue and grecn'tones being affected
by excessive heat). In no case, where instructions are carefully
followed, will the toned image deteriorate during the active life
of the film. Moreover, so far as can be ascertained, the wear
and tear of film which has been toned by the methods recom-
mended is in no way impaired. Cy virtue of the hardening
action of most of the toning baths on the gelatine tt is advisable,
especially during the winter months, to immerse the film for
three or four minutes in the usual 3 per cent, glycerine bath after
toning.

In case film has to be stored for long periods of time it is in-
advisable to tone the same, nor is it advisable to tone valuable
film unless duplicates of the same are available.

The life of the toning bath has been carefully investigated in
each case. The terra "life" is considered as the total length
of film capable of being toned by a given volume of fresh solu-
tion when toning is conducted continuously and without inter-
ruption.

In all cases it is false econonty to exhaust a toning bath to
the limit and thereby obtain inferior tones. The cost of the
chemicals employed is insignificant compared with the value of
the film being treated, being about one per cent per twenty-five
feet of film toned. (This calculation was made when chemicals
were not so high as at present.)

The figures given represent the capacity of the baths for ton-
ing under the best conditions. They apply only providing the
baths are kept covered to exclude light when not in use and pro-
viding no foreign metallic surface, however, small, is allowed to
come into contact with the solution.

As previously mentioned, single-solution baths are not intended
for use at very infrequent intervals. In such cases, two-solution
methods should be employed, although it is possible only to
recommend the latter for the production of green and blue-greeti
tones.

Copper Red Tone. Red chalk color. Use a snappy, rather
dark positive with this bath. After immersing the well-washed
film in water for one minute, place in the following:

1»

TINTING AND TONING MOTION PICTURE FILMS

Potassium Citrate 6 lbs. 4 ozs.

Copper Sulpliate 1 lb.

Potassium Ferricyanide i lb.

Ammonium Carbonate 8 ozs.

Water to 10 gals.

Dissolve each ingredient separately in as little water as pos-
sible, mix the filtered solutions so obtained in the order given,
and dilute to the required volume. The ammonium carbonate
should be almost transparent, and free from white powder.

To obtain the best results the bath should be employed at 70*
F. At higher temperatures inferior results are obtained and at
80' F. the bath is useless.

Tone for twenty to thirty minutes.

Washing should be continued until the high lights arc per-
fectly dear, which usually requires from ten to fifteen minutes.

With use, the bath precipitates a brown sludge of copper ferro-
c^anide, and in consequence becomes weaker by virtue of the
loss of copper. Ten gallons of the solution will tone about 1,000
feet of film without revival. As soon as the bath shows signs
of weakness it should be revived by adding separately one-quarter
the above amounts of copper sulphate, ferricyanide. and am-
monium carbonate, dissolved in as little water as possible — omit-
ting the potassium citrate.

The bath will not keep more than a few days even after being
so revived. In view of the relative instability of this bath, it
is more economical to employ a wooden drum immersed in a
shallow tank (using fresh solution as soon as exhausted in place
of the usual "tank and racks.")

Uranium Red Tone. Brownish red color.

Use a rather thin positive as this bath intensifies slightly.
Immerse the well-washed film in the following:

Avoirdupois

Uranium Nitrate (Neutral) 3 ozs. 150 Grs.

Potassium Oxalate (Neutral) 3 ozs. 150 Grs.

Potassium Ferricyanide i oz. 150 Grs.

Ammonium Alum 8 ozs.

Hydrochloric Acid 10 per cent. . . 6 ozs.
Water to 10 gals.

Since the nature of the tone is influenced largely by the add

tax

MOTION PICTURE PHOTOGRAPHY

content, it is very important that the uranium nitrate should
contain no free acid. Tliis may be assured by neutralizing a
solution of the same with dilute ammonia until a slight permanent
precipitate is obtained.

It is most convenient to keep stock solutions of the above (say
io% solution) wherewith a new bath may be expeditiously com-
pounded. A lofo hydrochloric acid solution is one containing
10 parts by volume of the acid per lOO volumes of the final
solution.

Slight variations of temperature around 70° F. produce no
apparent effect.

Tone for ten minutes. Since this and the following single solu-
tion methods of toning produce a marked intensiBcation of the
silver image — which intensification increases with the time of
toning — it follows that the nature of the tone changes with the
time.

The composition of the bath has been so adjusted that the
maximum effect is produced in about 10 minutes, the tone pass-
ing through a series of changes from brown to red during this
time.

Although it is possible to obtain intermediate tones by with-
drawing the film from the bath at shorter intervals, the tones
so obtained are not so "plucky," and it is almost impossible to
duplicate them. Elxperience has shown that modifications of
tone are best obtained by keeping the time of toning constant
and varyinfj the nature of the toning bath and that of the positive
film employed.

Wash from ten to fifteen minutes.

Usually the high lights will become clear in the above time,
although a thin yellowish brown veil invariably remains in the
clear gelatine as a result of the intensification of minute traces
of fog. This is of no account, however, in projection. If the
batli is working correctly this yellowish veil is only just per-
ceptible. Should it be at all marked, then either the film was
fogged during development, or the bath was not compounded
correctly. Washing should not be carried out for too long a
period, especially with water inclined to be alkaline, because the
toned image is soluble in alkali.

Ten gallons of solution will tone about 1,000 feet of film with-
out any appreciable change in the tone, aftgr which the rich tone

IBS

TINTING AND TONING MOTION PICTURE FILMS

tends to become flat as a result o^ a deficiency of acid in the bath.
At tills point the bath may be revived by the further addition of
acid to the extent of the original amount employed, when a fur-
ther i.ooo feet may be toned. After this stage the richness of
tone falls off rapidly and the bath should be thrown away. In
view of the sensitiveness of the bath to acid, the importance of
the neutrality of the ingredients is at once apparent.

Used intermittently over a period of several days, the life of
the bath is approximately the same.

With continued use a slight brownish flocculent precipitate may
form in the bath, but this should be only slight, otherwise it is
caused by incorrect mixing, the action of light, or by contact with
a metallic surface.

Uranium Red Crown. Reddish Sepia Color. Use a positive
that is a full shade lighter than a normal black and white. The
formula employed is the same as for Uranium Red tone, but
contains only half the amount of hydrochloric acid. The pro-
cedure is the same as that for Uranium Red Tone.

In view of the less energetic nature of this bath the life is
slightly longer than that for Uranium Red. If after i.ooo feet
of film have been toned the bath is renewed with acid to the
extent of

6 ozs io% acid per lo gals.

Then lo gals, of solution will tone 3.000 feet of film.

Sepia Tone by Uranium and Iron. This particular tone is
obtained by suitable admixture of red and blue toning solutions.
By varying the proportions of these baths, tones from red sepia
to brown may be obtained.

The following is only one of the many tones to be obtained
by this method. Increase in the proportion of the iron baths
makes the tone colder and vice versa.

Use a positive that is a full shade lighter than normal.

1 Immerse well-washed film in
Solution for Uranium Red Brown 9 vols.
Solution for Iron Blue I vol.
The instructions regarding method of procedure, life of bath,
etc, are exactly the same as for Uranium Red Brown.
Sulphide Yellow Brown for Tinting. This tone is seen to ad-
vantage only when subsequently tinted, as when used without
tinting it gives a very unpleasing brindle brown.

MOTION PICTURE PHOTOGRAPHY

Use a normal print for this tone as it reduces just about the
correct amount for tinting.

A. Potass. Ferricyanide 3 lbs.

Potass. Bromide i lb.

Water to 10 gals.

B. Sodium Sulphide crystal 3 oz.

Hypo crystal 8 oz. .

Water to 10 gals.

It is convenient to keep solutions of hypo and sodium sulphide
i(say 20%) and measure these out by volume as required. A
trace of iron in the sodium sulphide is of no moment providing
the stock solution is boiled and the precipitated iron sulphide al-
lowed to settle before use.

The well-washed positive is thoroughly bleached in A, washed
for five minutes, and immersed in solution B, until the film is
thoroughly toned. This bath appears to "ripen" slightly with age
so that a small amount of used bath should be added wheti com-
pounding fresh solution or a waste piece of film should be toned
in the new bath to secure the same effect.

The effect of temperature on the solution A is simply to hasten
the bleaching. With bath B. on immersion of the bleached fihn
two reactions occur:

(a) Solution of the silver bromide in hypo.

(b) Conversion of the silver bromide to silver sulphidje.
Normally, good results are obtained at 70* F. Owing to the

increased solvent power of hypo for silver bromide at high tem-
perature, the tone becomes warmer and the image has less con-
trast at a limit of 75" F.. beyond which it is inadvisable to go.

Hence, if the tone is too cold and the film too opaque, the tem-
perature should be increased one or two degrees from 70** F. and
vice versa.

Tone about five minutes and wash fifteen minutes.

The bleaching bath A will keep until exhausted. Ten gallons
of bath B will tone about 2,ocx> feet of film, after which there is
a tendency for a dichroic fog-like deposit to form on the surface
of the film during toning owing to the hypo becoming saturated
with silver bromide. As soon as this happens, the bath should be
renewed.

Green tones by Vanadium and Iron. Use a normal black and
white positive for this fonnula.

TINTING AND TONING MOTION PICTURE FILMS

Tone m the bath prepared as follows :

Avoirdupois

A. Oxalic acid i lb. 4 oz.

Vanadium stock solution 40 oz.

Water to 5 gals.

Avoirdupois

B. Potass, ferricyanide 3 02s. 145 grains

Water to 20 gals.

C. Ferric Alum 8 oz. 145 grains

(Ferric Ammonium Sulphate)

Potass. Bichromate 72 grains

Oxalic acid 7 oz.

Potass, ferricyanide 3 02.

Water to 15 gals.

Dissolve each of the clieraicals separately and mix the solu-
tions obtained strictly in the order given. *

Avoirdupois

D. Ammonium Alum 3 lb. I oz. no gr.

Hydrochloric acid lO^fc ••■•^3^2 oz.

Water to 10 gals.

Total Volume 50 gals.

Add B to A with stirring; then add C, and finally add D to
the mixture. The solution is then ready for use.

The syrupy variety of Vanadium Chloride sold by Merck is
recommended although its nature appears to vary with different
batches, certain samples being very difficult to incorporate with
the toning bath without giving rise to precipitation.
Vanaditm] Stock Solution :

Avoirdupois

Vanadium chloride (syrup) 3>5 tl. oz.

Oxalic acid 3 oz. 200 gr.

Water to ^ gal.

Any sludge which may have been deposited from the vanadium
chloride should be included also and the whole heated in a glass
or enamelled vessel until a clear blue solution is obtained.

The method of mixing the various solutions A, B, C and D is
of the greatest importance. They should be mixed only in the
concentrations recommended and strictly in the order pvcn. Un-
less this is done, the vanadium will precipitate out as a green
sludge.

MOTION

PICTURE

PHOTOGRAPHY

Variations o( temperature around 70° F. have little or no effect.

Tone ten to fifteen minutes and wash for the same length of
time. Washing should be thorough as it is only during washing
thai tlie rich green tone develops.

Ten gallons of solution will tone about 1400 feet of film
without any appreciable deterioration of tone, and if at this
point, and after each 1, 000 feet, the bath is revived by the addi-
tion of hydrochloric acid equivalent to the amount originally
employed : i.e.

2^ ozs., lofc Hydrochloric Acid per 10 gals.
3,000 feet may be toned. As the bath becomes exhausted it may
be found necessary to increase the time of toning to fifteen
minutes. It is not permissible to add further amounts of vana-
dium chloride in order lo revive the bath, as the vanadium would
then be precipitated. The vanadium may be incorporated with
the bath only at the time of mixing.

Used intermittently the life is approximately tlie same.

Greenish Blue Tone With Vanadium And Iron. Use normal
black and white positive for the formula.

The formula employed and instructions are exactly the same
as for Green tones by Vanadium and Iron, except that the pro-
portion of Vanadium chloride is as follows:

Vanadium Chloride Stock Solution.
Per 10 gal. of batii, 4 ozs.

and only half the amount of hydrochloric acid should be em-
ployed. It is not i)ermissiblc to convert this bath to the pre-
ceding by the addition of further amounts of vanadium chloride,
in which case the latter would be precipitated.

Positives for this bath should be a full shade or even two
shades lighter than normal and should be developed in metol-
hydroquinone developer as a plain hydroquinone formula docs not
give good results with this bath.

Avoirdupois

A. Potassium Ferricyanide 4 lbs. 4^ ozs.

Ammonia .880 13 ozs.

Water to to gals.

Bleach for two to ten minutes, then wash for ten or fifteen
minutes, tone in the following :

TINTING AND TONING MOTION PICTURE FILAiS

B. Ferric alum (crystal) Avoirdupois

(Ferric ammonium sulphate) ....13 ozs. 2 drams
Vanadium chloride (stock sol.) ••-25 il, ozs.

Potassium bromide 6 ozs. 5 drams

Hydrochloric acid (concentrated). 2>^ ozs.
Water to 10 gals.

Refer to green tones by Vanadium and Iron for composition of
vanadium stock solution.

Temperature of toning should be around 70® F. and the time
of toning ten to fifteen minuter.

Wash for ten minutes after toning.

Providing bath A is screened from the light and kept covered
in order to prevent the undue escape of ammonia, the bath keeps
fairly well. Should it show any signs of weakening it should
be revived by the addition of a further quantity of ammonia
equal in amount to that originally used. If so revived at in-
tervals, 10 gallons will bleach 8,000 feet of film before exhaustion.

Ten gallons of solution B will tone 6,000 feet of film without
further addition of acid, after which it should be thrown away.

OUve green tones with iron (two solutions).

This tone is almost indistinguishable from those obtained with
vanadium. Use a thin metol-hydroqutnone developed positive
with this formula^ plain hydroquinone does not give very satis-
factory results.

Bleach in solution A as for green tones by vanadium and iron,
and after washing for ten to fifteen minutes tone in:

Avoirdupois

Ferric A!um 13 oz. 2 drams

Potassium bromide 6 oz. 5 drams

Hydrochloric acid (concentrated). 2><S oz.
Water to 10 gals.

The time of toning, washing, life of bath, etc., are the same
as for green tone by Vanadium and Iron. Should the high lights
of the toned image be stained blue, this is due to insufficient
washing after bleaching:

Iron Blue Tone. Use normal or slightly thin positive. Tone
in the following ;

187

MOTION PICTURE PHOTOGRAPHY

Avoirdupois

Potassium bichromate 15 grains

Ferric Alum i oz. 250 grs.

Oxalic acid 4 oz.

Potassium ferricyanide ,..,,... i oz. 146 gT3.

Ammonium alum 6 oz. 5 drams

Hydrochloric acid 10^ i oz. 2 drams

Water to 10 gals.

The method of compounding this bath is very important. Each
of the solid chemicals should be dissolved separately in a small
quantity of warm water and the solutions allowed to cool. Then
the latter should be filtered into the tank strictly in the order
given, and the whole diluted to the required volume. If these in-
structions are adhered to, the bath will be free from any sign of
precipitate and will remain so for a considerable period.

Tone for ten to fifteen minutes and wash ten to fifteen minutes
until the high lights are clear. A very slight permanent yellow
coloration of the clear gelatine will usually occur, but should be
only just perceptible. It is of no moment in projection. Should
any sign of blue stain occur, it is an indication of a stale bath
or incorrect mixing of the same. These remarks regarding stains
apply in all cases where single toning solutions arc employed.

If the acid is replaced to the extent of the original amount
after toning each i.ooo feet, the bath will on the whole tone
3,000 feet per ten gallons of solution.

If even after revival, the tone remains flat, the bath is exhausted
and should be thrown away. As the bath becomes exhausted,
the time of toning should be extended a little longer than ten
minutes in order to obtain the necessary contrast.

After continued use, a slight bluish sludge will collect in the
bath, but this is of no n»ment. Should this form, however, to
an appreciable e«xtent, it is due either to incorrect mixing, the
action of light, or to contact with metallic surfaces.

Two-Solution Iron Blue Toning Bath. Starting witl) a light,
normal positive, this is toned according to instructions given for
olive-grccn tones with iron.

The tone image is then immersed in the following 5xing bath
for three minutes;

TINTINC AND TONING MOTION PICTURE RLMS

Hypo (crystal) 8 lbs. 5 ozs.

Sodium bisulphite (EKCo) 2 lbs. l% oxs.

Water to 10 gals.

After fixing, the film is washed for ten to fifteen minutes. If
the resultant image is too thin, the toning solution should be al-
lowed to act for fifteen minutes, or positive film of greater con-
trast should be employed.

Violet Tone With Iron and Ammonia. Iron blue tones may be
converted to violet or dark blue by immersion for one to two
minutes in the following bath.

Avoirdupois

Ammonia Pure .880 3 to 5 ozs.

Water to 10 gals.

Wash for one or two minutes and dry.

-After some time the film will turn blue again but the violet
tone can be restored by treatment with ammotiia.

In many cases pleasing effects may be obtained by tinting film
which has already been toned. The result is that the clear por-
tions of high lights assume the color of the dye, whilst the
shadows and half-tones project a tint intermediate between that
of the dye and the toned deposit

Considerable judgment is necessary in choosing suitable tints
to blend with any given tone.

The most successful combination of toning with tinting is in
the production of sunset and moonlight effects over water. First
tone bhae and subsequently tint "orange" or "red."

The following combinations will cover jf-- "^vs required:

Yellow Brown tone witli pink tint. '^intiip

Green and Blue tones with light yellow tint.

Blue and Violet with almost any delicate shade. .

It is considered unnecessary to illustrate every -mbination
of tone and thit. Only typical examples have fe-vu given. It
must be noted that toned film except copper and sulphide toned,
dyes more quickly than untoned film in any given dye bath. In
order to obtain the exact tints above, the dye bath should be
diluted with about an equal quantity of water.

Dye for five to ten minutes, according to shade desired.

The equipment necessary for systematic toning and tmthig is
essentially dw same as that reqtiired for dcrclopaient* consiatizig

MOTION

PICTURE PHOTOGRAPHY

of the usual tanks and racks or small drums. It is highly de-
sirable to use the same for this purpose exclusively and if pos-
sible keep in a separate room thus excluding any possibility of
contamination either by the copper or sulphiding bath, which
would cause development fog immediately.

The "drum" system, on account of the great expense involved
in apparatus and the larger space required for manipulation, is
not to be recommended for toning and tinting operations. For
the worker on a small scale, who desires only to produce short
lengths of film occasionally, a small wooden drum revolving in
a shallow wooden tank is most efficient and economical. The
tanks employed should be of slate or other resistive materials, and
have in an outlet at the bottom a hard-rubber stopcock or a
wooden plug.

Wooden tanks may be used but when once used for one color
cannot be used for any complementary color.

The tank containing the sulphiding bath should be enclosed in
an outer tank through which hot or cold water may be circulated
in order to control the temperature. The racks or dnuns
may be of wood, but if metal pegs are employed they
should be coated with an acid-resisting paint such as asplialt.
The presence of any metalic surface in the toning baths will
cause contamination of the same and effect a precipation of
sludge. Neither toning nor tinting frames should be interchanged
but should be kept separate in order to prevent contamination
of one bath by frames employed in another. This also applies
to the small drum system. A pink tint would be ruined by using
a rack which h?'' ' -n immersed in a deep blue dye bath unless
the rSf,. -.1 washed thoroughly.

In trie case of delicate tinting, however, no harm is done pro-
viding the racks have been coated with the following waterproof
varnish :

Aiwrdupois

Hard Paraffin i lb. 5 ozs.

Syrian asphalt i lb. 5 ozs.

Benzol 4 gals.

Carbon tetrachloride 3 E^^'s.

Before varnishing it is preferable to immerse the racks in a
ifo solution of hydrochloric acid for two or three minutes and

190

■mmxG AXD TOKTXG MOTION picmiE nuis

wash for fifteen

Dky iIwwieMj, Then ^ the vdl-
i off tbe excess liquid.

dried racks in dse above

The varnish dries mfanoa innerfinciy.

The yamwhmg ififw ail he njxaled at ntervali.

Developers. Inning wawliMh aao oyti wowM be — '^^'^ tn
crocks of ^azed eartbeovsre. Use vsfv water vbea irmifr*''
and ensure tborongh soiuiiM hf aaning with a wooden paddle,
which should be itiwnMg^iljr imfaed afer eadi operation. FUt-
ing dissohrcd ibt i lifiiii ah in ss mtoM a ijimiiIIIj of hoc water as
possible, the sohttaoo sbonU be cooled 80 diat on dihitica the final
solution will be at appauaiamdy tbe correct temperature.

The chemicals eiupfci^ed daoold be paic When a good water
supply is not araihUe, ditfiBrd water oofjr should be employed.
_ In "tinting", the foOowing factors most be taken into coo-

leration :

Dye«tuffs are chemkally of two different types, add and basic;
so-called acid dycstnffs are tbe alkafi — usually sodium salts of
organic adds — whilst basic djrestnffs are tbe chlorides, sulphates,
etc.. of organic bases.

For the tinting of fihn only "acid" dyestuffs should be con-
sidered, since "basic" dycstnffs tisnaUy enter the gelatine so
rapidly that satisfactory control of the dyeing is impossible.
Moreover, it is not possible to make a complete selection from
basic dyestuffs alone. Such a selection wcmld necessitate the use
of acid and basic dyestuffs in admixture — a procedure highly un-
desirable and. in many cases, impossible.

Any dyestuffs suitable for admixture to prtxluce intermediate
tints should possess the foUow4ng properties:

The dye should be inert and not attack the gelatine or support
This is of fundamental importance as the gelatine coating of dyed
film in many cases has a tendency to lose its flexibility, causing
what is known in the trade as "brittleness."

Several dyestuffs when employed at a concentration of i%, at-
tack gelatine readily at 70° F. and \-igorousIy at 80" F.. especially
in presence of small amounts of acids, producing a marked
softening and often partial solution of the film. The effect is
roughly proportionate to tlie concentration of the dye and to the
temperature, and varies with each individual dyestuff. Exper-
ience shows that the gelatine coating of film which has been
softened in this way by the dyestuffs becomes "brittle" on sub-
sequent projection.

MOTION PICTURE PHOTOGRAPHY

The actual factors in the production of brittleness are:

1. The hydrolysis of the acid which, in many cases, is added
to assist dyeing. If a solid acid has been employed the heat en-
countered during projection will greatly accelerate this hydrolysis.

2. The corrosion of the dye itself. Dyes vary considerably
in this respect according to their particular composition. So far,
it has not been possible to make any general classification of dye-
stuffs in this connection, thoug^i nitro compounds appear to be
particularly corrosive in their action.

3. The presence of impurities in the dycstuff. Tlicsc take
the form of excessive amounts of loading material, such as soditmi
sulphate or chloride, or small traces of iron, the latter having a
tendency to harden the film considerably.

In all the above cases, the nature of the gelatine is altered. It
loses its property of remaining resilient under normal conditions
of temperature and humidity and becomes "brittle."

A suitable test as to whether a dyestuff has any propensity
to produce brittleness is to incubate a sample of film, half of
which has been dyed, for about 48 hours at 100* degrees C. If
any difference in brittleness is noticeable between the dyed and
undyed portions so treated, the dye is unsuitable for tinting.

On the contrary most dyestufis, when used at a concentration
of 1% and at 80" F., produce more or less softening of the gela-
tine. This may be prevented by :

(a) Use of dilute solutions only. Except in special cases, a
dye solution stronger than 0.5% is seldom required. The usual
strength employed is about 0,2%, at which conceniratioo no
softening usually occurs.

(b) Omission of acid from the dye bath.

(d) By slight hardening of the film before dyeing and sub-
sequent softening by glycerine, as described betow :

The dye should not "bleed" to any considerable extent when
the film is washed : in other words, the rate of removal of the dye
should be slow and be almost imperceptible in a period of say, five
minntes.

Generally speaVing. basic dyestuffs which are absorbed readily
by gelatine do not bleed whilst most acid dyestuffs which djre
gdattne much more slowly bleed consideiably. The rate of bleed-
ing appears to vary inversely as the affinity bciweeu tbe dye and
the fchtine.

TINTING AND TONING MOTION PICTURE HUMS

In tinting, bleeding is of considerable importance.

During the period between rinsing after dyeing and the placing
of the film on the dr)'ing rack, any drops of water on the surface
of the film become more or less saturated with dye. These, after
drj'ing, remain as spots and irregular markings which are very
apparent on the screen.

It is possible only in very few cases to modify this bleeding
by an acid "stop bath," and it may be considered a general rule
that the bleeding of a dyestuff is a property pecuhar to itself.
In making a selection of dyes therefore, it is necessary to choose
only those which have a minimum propensity to bleed.

The rate of dyeing should be only slightly affected by the addi-
tion of acid to the dye bath.

In some instances it has been recommended to add a small
amount of acid to the dye bath to obtain more transparent re-
sults and to increase the rate of dyeing, but we do not recommend
the use of acid for the following reasons:

(a) Acid magnifies the effect of temperature both on the rate
of dyeing and on the softening of the gelatine.

(b) Acidified dye baths ii.sually dye too cjuickly and often pro-
duce uneven dyeing around the perforations. Moreover, in
many cases the degree of dyeing is very sensitive to changes in
acidity. Since the acidity of the bath falls off with use. just as
in toning, it is almost impossible to duplicate results systematic-
ally.

If acid is used it should be a volatile acid such as acetic acid,
as any solid acid is retained in the film after dyeing. In all cases
the effect varies with the particular dyestuff employed, and may
be considerable even when the acid (acetic) is present only to
Ihc extent of .02%.

The dyes should be stable to light and not be "dichroic" or
change color on dilution.

Moreover, the wear and tear of the film should not be impaired
in any way after dyeing. Even after incubating for 48 hours at
100* C, no difference should be discernible between dyed and
undyed films.

The dyestuff should not be affected by "h>-po" since any fixing
solution left in the film, or accidcnUUy splashed thereon, would
destroy the dye immediately.

Examination shows that most dyes fail on the "bleeding" test.

MOTION PICTURE PHOTOGRAPHY

whilst others, which might otherwise appear entirely suitable, at-
tack the gelatine at higher temperatures or cause "briltleness."

In view of the large number of tints required in commercial
work, it is undesirable to keep a separate dye-powder for the
preparation of each particular bath. Prepare the same by ad-
mixture of three or more dyestuffs. H three only are employed.
mixing must be conducted with great precision in order to re-
produce any given tint. This difficulty is overcome by the use
of intermediate colors.

The following five standard dyes have been diosen as fulfilling
the above conditions as nearly as possible. By suitably mixing
solutions of these as indicated in the specimen chart, almost any
desired tint may be obtained:

Name used in Formula Commercial Name

Cine Red
Cine Orange
Cine Yellow

Cine Blue-Green
Cine Blue

Chromotrop FB
Orange GRX
Qu incline Yellow

Mamtfaclurer
Hoechst
Badische
Badische

(Hoechst, Agfa.)
Brilliant Patent Blue Hoechst
Naphthaline Blue 12B Hoechst
Kalle

Abbreviations

Hoechst is Farbwerke Hoechst Co., 122 Hudson St., New
York City.

Badische, Badische Co., 128 Duane St., New York City.

Agfa, Berlin Anilin Works. 213-215 Water St.. New York City.

Kalle, Kalie and Co., 530 Canal St., New York City.

These dyes are the commercial grades as supplied by the
various dye makers. As a rule, they contain about 20%
of loading material in the form of sodium chloride or sodium
sulphate which in no way injures the film.

The relative cost of pure dyestuffs compared with commerdal
samples prohibits their employment commercially.

The amount of impurity in the dyes may vary slightly from
batch to batch. This variation is usually so small as not to affect
materially the nature of the tint obtained from any particular
formula. Moreover, dye samples of the same name supplied by
different makers may differ considerably in their properties, par-
ticularly with respect to "bleeding."

TINTING AND TONING MOTION PICTURE FILMS

All tints we have described were obtained with dye samples
from the makers indicated. Should dyes oi other makers be cm-
ployed, the proportions stated may require slight modifications

Match any given color under artificial light only.

Tint No. Formulae for Tintmg Avoirdupoit

1. Gne Red 2 lbs.

Water 50 gals.

2. Cine Red 8 oz. 145 grains

Cine Yellow 8 oz. 145 grains

Water 50 gals.

3. Cine Red 5 oz. 220 grains

Cine Yellow 5 oz. 220 grains

Water 50 gals.

4. Cine Red 3 oz. 350 grains

Gne Yellow 3 oz. 350 grains

Cine Blue-green 320 grains

Water 50 gals.

5. Cine Red 5 oz. 260 grains

Cine Orange i lb. 11 oz. 175 grains

Water 50 gals.

6. Gne Red l oz. 175 grains

Gne Orange 6 oz. 350 grains

Water 50 gals.

7. Cine Orange 1 1 oz, 45 grains

Water 50 gals.

&. One Orange 16 oz. 300 grains

Gne Yellow i6 oz. 300 grains

Water 50 gals.

9. Cine Orange 4 oz. 75 grains

Cine Yellow 4 oz. 75 grains

Water 50 gals.

la Gne Yellow 2 lbs.

Water 50 gala.

11. Cine Yellow 8 oz.

Water 50 gals.

12. Cine Yellow i lb. 4 oz.

Cine Blue-green 2 oz.

Water 50 gals.

13. Cine Yellow 14 oz.

Cine Blue-green 2 oz. Z5<> grains

MOTION PICTURE PHOTOGRAPHY

Tint No. Formulae for Tinting AvoirdrnfotM

Water 50 gals.

14. Cine Yellow 7 02.

Cine Blue-green i oz. 175 grains

Water 50 gals.

15. Cine Yellow 9 oz. 130 grains

Cine Blue-preen 7 oz. 175 grains

Water 50 gals.

16. Cine Blue-green i Ih.

Water 50 gals.

17. Cine Blue-green 4 oz.

Water 50 gals.

18. Cine Red 250 grains

Cine Blue-green 12 oz. 30 grains

Water 50 gals.

19. Cine Blue 4 oz.

Water 50 gals.

20. Cine Red 6 02, 145 grains

Cine Blue-green 4 oz. 350 grains

Water 50 gals.

21. Cine Red 3 oz. 85 grains

Cine Blue-green 2 oz. 175 grains

Water 50 gals.

22. Cine Red 5 oz. 175 grains

Cine Blue-green I oz. 260 grains

Cine Yellow i oz. 1 50 grains

Water 50 gals.

23. Cine Red 3 02. 90 grains

Cine Yellow 380 grains

Cine Blue-green 1 oz. 30 grains

Water 50 gals.

24. Cine Red 10 oz.

Cine Blue i oz.

Water 50 gals.

The solid dyestuffs are thoroughly dissolved in as small an
amount of hot water as possible and filtered through fine muslin.
Hot water should be poured over any residue, which should be
slight, in order to ensure thorough solution of the dye. Then
the dye solution should be diluted in the tank to the required
volume at 70" F.

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TINTING AND TONING MOTION PICTURE HUMS

Except in special cases, such as Bre scenes, sunset and moon-
light effects, it is very undesirable to employ strong tints. Apart
from the displeasing effect and irritation to the eye, the dye-
stuffs produce a slight softening of the gelatine film when used at
80* F. in 1 % solution.

Should it be necessary to employ such concentrated baths in
summer, it is necessary either to cool the dye baih or use a suit-
able hardener. No trouble will be encountered if formalin
(40%) be added to the dye bath to the extent of i volume to 400
volumes of dye solution. This is unnecessary if hardener was
employed in the fixing bath after dcveloiiment.

During the winter months it is advisable to treat all film after
developing and fixing with glycerine. The latter may be in-
corporated with the dye bath thereby eliminating an extra opera-
tion. The strength of the glycerine should be 2%, or two volumes
per one hundred volumes of dye solution. However, in most
cases the addition of glycerine considerably retards the rate of
dyeing. Therefore, in order to obtain the same degree of tinting
within a period of ten minutes the concentration of the dye bath
should be increased accordingly.

The use of delicate tints both removes the contrasting black
and white effect and adds a touch of warmth to the black de-
posit of silver, even in cases where the high lights are insuffi-
ciently stained to be noticeable. In many cases the result is
equal to that obtained by partial toning.

Although temperature has little effect on the rate of dyeing
with the dyes recommended, it is advisable in all cases to woric at
70° F. in order to produce uniform results and avoid any danger
of softening the filnv

Only good "plucky" positive film may be successfully tinted.
As tinting tends to reduce contrasts, the positive should be of nor-
mal density but slightly on the hard side.

Time of dyeing depends somewhat on the previous handling
of the film. Film which has been fixed in a bath containing or-
dinary, or chrome, alum dyes more quickly than that treated
with plain hypo and hardened with formalin. It is probable,
therefore, that small traces of alum are left in the film even after
prolonged washing. The alum serves as a mordant for the dye.

The film for dyeing should be fixed in hypo containing sodium
bisulphite only (25% hypo with 2.5% sodium bisulphite — the
cooled bisulphite being added to the cooled hypo). In case an

197

MOTION PICTURE PHOTOGRAPHY

alum fixing bath is employed or if, for any other reason, the tinta
indicated are not obtained in the time given below, either the
time of dyeing or the dilixtion of the dye bath must be altered.

The concentration of the dye bath has in each case been so ad-
justed that dyeing is complete in ten minutes — which time is con-
sidered a minimum for the production of uniform results, and
for complete control of the dyeing operations. Shorter time of
immersion will produce lighter tints. As is the case of toning,
experience has shown that in order to produce uniform results
it is advisable to keep the time of dyeing constant, and obtain
varying effects by chan^ng the composition of the dye baths.

Should the film for any reason be over-dyed, a small portion
of the dye may be removed by washing from lo to 15 minutes,
though the particular fastness of the dyes allows only slight mis-
takes to be rectified in this manner.

Life of the dye bath averages about 40,000 feet per 50 gallons
dye bath. The bath may be revived at intervals by the addition
of more dye, though this procedure is uncertain. It is generally
advisable to mix fresh solution.

Either the "dnim" or *'tank" method may be employed. In
either case after dyeing for ten minutes (during which time the
rack should be agitated in order to ensure even dyeing and
prevent accumulation of air bubbles) the 61m should be given a
thorough rinsing in plain water.

Before drying film on racks it is advisable to set the rack at
a slight angle for a few minutes, so enabling the surplus water
to drain off through the perforations. If drums are used for
drying it is advisable to remove the surplus water by whirling
the drum previous to dr>'ing.

Patchy and streaked film results from insufikient washing of
the positive after fixing and before dyeing, insuflficient agitation
of the rack when in the dye bath, and the use of dyes which
"bleed" too freely.

In general, almost any tint, if delicate, may be employed with
advantage. For general use those ranging through pink, rose,
orange, yellow, pale green and pale blue, are recommended — -
others are for special purposes. The nature of the tint as seen
in the hands is no criterion of its appearance on the projected
image, though by a little practice and by viewing only by arti-
ficial light, it is possible to preconceive the appearance of any
sample on projection.

Chapter XII
CUTTING AND EDITING

WITH the gratifying general progress of events toward a
higher standard in motion picture art comes the neces-
sity for scrcpulous and painstaking care in every detail
and department of production and finishing. Methods that were
the result of a naive scramble for wealth in an *'easy money"
market are obsolete. Tlie old timers are almost relegated to
the background. The old order is fast changing, giving place to
new methods, new systems and new men. And in the great
struggle for the survival of the fittest success depends upon the
perfection of every detail.

It is gratifying to note that titling, that most important detail
in the making of a picture, is receiving more and more attention
from producers. They realize that more effectiveness as well
as considerable saving in expensive crowds and settings can be
gained by collaboration with a titler who is an expert literary
craftsman.

One of the first indications of an awakening consciousness of
the value of titles was seen in the mechanical end of their making.
A more elaborate style of letter was introduced and later this was
elaborated by the introduction of silhouettes or allegorical figures.
Rarely indeed, were these good, in many instances they were
laughable. Nevertheless they were welcome, for they were in-
dications of improvement. This pseudo-artistic decorative work
had a long run and is still in vogue to a considerable extent. It
has not the qualities to make it a joy forever; folk tire of it.
Gradually it must meet the exactions of art.

A more important question is: How improve the literary value
of the writing of the titles? Here is a field as wide as the in-
dustry itself. The old-style running commentary on the picture,
with its crudities, barn-storming heroics, cheap platitudes and
abortive attempts at fine phrasing, is doomed. It cannot with-
stand tlie ever-increasing pressure of an elevating competition.
Those who write these titles must cither mend their ways or find
other occupation in keeping with their limitations.

MOTION PICTURE PHOTOGRAPHY

In the pictures of certain producers a great advancement in
titling may be noted. These concerns apparently take a wider
view of their mission in life than merely to earn dividends. As
soon as a producer's aspirations are limited by the boundary line
of "profits," the quality and grade of his work suflfers. He tries
to "get by" with cheap effects — including inferior titling — and
immediately the discerning eye can read the writing on the wall.

Titles, to stand the test, must set forth the very spirit of the
play — they must fill the blank that invariably exists between
picturization and drama. The most intelligent audience would
fail to get the significance of an author's intention without titling.
Upon it lai^ely depends the success of the picture. That being
the case, why not insist upon good titles?

Good titles should be felt rather than seen. That is to say the
subconscious appeal of the words should be such that the audience
actually lives the part with the actor and literally feels the emo-
tions portrayed on the screen. This is worthy work for the
word-artisL Further, the style of the title should be such that
the words f!ow easily, there must be no jarring note nor dis-
cordance. The words must open the door into the mind of the
audience with graceful and powerful tact.

Successful titling calls for highly specialized ability. It is a
profession, one that by its very nature will never be overcrowded.
The process of elimination is becoming more severe as the public
becomes more educated and better able to appreciate the merit of
a picture and its accessories. Adequately to convey a world of
sentiment, pathos or entliusiasm in a few short words, calls for
skill. Many who attempt it never rise above the succinct phrase-
ology of the "ad" man — their work is cold, staccato, and fcel-
ingless. The able title writer is worthily in a foremost place
among those who make movies. In his hands lies the making or
marring of a picture.

It has been argued that the public is no judge of the literary
value of titles, and therefore anything readable will "get by."
Nothing could be more inaccurate. If the public doesn't think, it
feels. The unerring instinct of an audience invariably pays a
tribute to good work, whether titling, or directing, or acting. All
of these points must be carefully considered by producers who
wish to turn out worth-while work; and they will be well ad-
vised to get the best obtainable in the brain-market to safeguard

their titling.

soo

CUTTING AND EDITING

The profession of writing titles has all the dignity of a literary
career — the audience is vast enough to appeal to the arabitions
of any writer. The work calls for inherent as well as acquired
culture and it may be recoiiunended as a career to the young men
from our universities. Even with their academic training, they
will find it difficult to keep pace with the ever-increasing require-
ments of the craft. Yet they will have the satisfaction of know-
ing that their vocation is one that takes its place among tlie con-
structive works of the world.

The word suh-titlc is a rather loose term, commonly used to
designate all reading matter, except the main or lead title, which
appears on the screen. A more correct designation divides the
term into two sub-headings: Captions, meaning all explanatory
reading matter, and Spoken Titles, meaning all words put into
the mouths of the characters and indicated by quotation marks.

When, where and why are sub-titles necessary or desirable!'.
Some of the reasons for tlieir use are:

1. To explain the purpose or indicate the main theme of the
picture.

2. To give the picture coherency. They are links which join
the scenes and help to carry the thread of the story.

3. To name and characterize the principle roles portrayed ; to
identify setting or location, and sometimes to fix the time of the
story or any of its parts.

4. To illuminate and interpret the picture or any of its situa*
tions by conveying ideas which the action does not or cannot
register,

5. To inject comedy, pathos, or other sentiments which may
be entirely arbitrary, into the picture.

6. To indicate lapses of time, or cover jumps in the continuity-

7. To economize footage or save production costs by sub-
stituting for scenes not shown.

Some of these uses, may at>peaT to be similar and some of them
may overlap. One sub-title may serve two or more of these pur-
poses. On the other hand, a sub-title may be required for only
one of these definite reasons.

There are as many ways of wording or phrasing a given sub-
title of moderate length as there are individuals who may write
it. Perliaps each one would consider his style and wording the
best. It is certain that no two would write it exactly the same.

MOTION PICTURE PHOTOGRAPHY

There is and can be no set niles to govern its composition and
no definite standard by which it may be measured. Its fi"a'
form must be dictated by the intelligence, judgment and experi-
ence of the writer.

There is wide diversity of opinion as to what constitutes a
good and suflficient sub-title. Some people favor a florid or high-
sounding style, while others advocate a condensed, almost ab-
breviated form. As a matter of fact, each kind may have its
proper uses, depending upon the character of the story and its
interpretation in the picture. The sub-title writer should en-
deavor to sense the atmosphere and characterizations of the pic-
ture as they are shown on the screen. He must make the titles
fit the scenes as played, not as he thinks they should have or
wishes they might have been portrayed.

Sub-titles should be fitted into a picture so that, instead of
interrupting or irritating, they help the natural flow of the story
and add to its interest. If they are too few or too short and
abrupt they may defeat this purpose as efTeclually as when they
are too numerous or too long. Everybody knows how interest-
ing a spoken or written story may be when told by a master and
how flat or insipid the same tale is when related by an unskilled
narrator.

It is often much more difficult and takes more time and study
to decide not to insert a sub-title than to write one. If a sub-
title will not help a scene, or if one is not actually needed, it is
safe to leave it out. It is not always as simple and easy to
write a suitable sub-tit!e to fit a given scene as it might seem
to one who views the finished picture. It is much easier to
write a long and flowery sub-title than one which is terse and
expressive. A caption of moderate length, designed to cover
several points, is often revised and rewritten a dozen times
before it asstmies satisfactory form. Sub-title writing has its
nuisances as well as music and art Words that may express
the desired thought must sometimes be discarded because they
are too long or unfamiliar to the average motion picture patron.
The best captions and the most difficult to formulate are ex-
pressed in a few words of simple, correct English devoid of
technical or uncommon terms.

Captions covering a considerable lapse of time should not be
too short. There is a psychological reason for this. It may

903

CUTTING AND EDITING

seem sufficient to cover a lapse of time by simply flashing: "A
Year Later" on the screen. If this short caption follows intense
action or suspense, the audience should be given a little longer
time in which to relax and to grasp the new thought before the
next scene is shown. Therefore a caption containing from six
to ten words may sway the trend of thought smoothly and
pleasantly and without the mental wrench that the shorter caption
might give the average person. Of course this docs not apply
when surprise is desired.

Often spoken titles present many difficulties. Witness the
mushy, inane speeches put into the mouths of some characters in
love scenes — speeches such as one would never make. The
effort should be to write spoken titles that will .^em natural and
at the same time be in keeping with the character. A speech that
may sound all right when actually spoken, with the advantage of
inflection and cn^hasis, may seem very flat when thrown upon
the screen.

Dialect -spoken titles are tricky and should be used sparingly.
They are usually difficult to read and often fail to impress. Very
few people can write any dialect with great success, especially
for pictures. Probably no one can write all dialects satisfactorily.

Long spoken titles should be avoided as much as possible.
Better to have two or three short ones than a single long speech,
provided the scene will carry more than one. As a rule it is better
to have one sentence, worded, punctuated, and spaced to read as
smoothly as possible. Many spoken titles containing two or more
sentences could be condensed into one by a liltle thought and
study. But brevity may be overdone. It is often easier to catch
the sense of a well-rounded sentence than one which has been
clipped too short.

Title cards should be edited carefully by the title writer before
they are photographed. The idea contained in a sub-title is often
obscured by crowding, bad spacing, incorrect or unnecessary divi-
sion of a word at the end of a line, (due to poor judgment on
the part of the man who letters the cards), making the words
hard to read or difficult to interpret readily.

Spoken titles should not be cut into long shots if it can be
avoided because it is often difficult to be sure which person is
speaking. If possible, flash to a close-up of the person talking,
cut in the title, another flash of the close-up and then back to

303

MOTION PICTURE PHOTOGRAPHY

the long shot. A very short piece before and after the spoken
title will accomplish this purpose and add very little to the iooi'
s.gc. Ha close-up is not available and the spoken title is essential
to the scene then write it so that the audience may be sure which
person speaks.

In writing sub-titles and also in cutting a picture keep the
audience constantly in mind. Try to work froni the point of
view of the person who is going to look at your picture. Re-
member Ihat the people seeing the picture but once will not be
as familiar with it as those who have run it over and over while
working on it, and that the public may not catch the fine points
that have become quite familiar or obvious to you.

While a certain amount of latitude in language is allowable in
spoken titles, captions should be written in good English and be
correct grammatically. Study, analysis, judgment and experi-
ence arc as necessary in writing good sub-titles as in any other
department of picture production. Ability to write stories, ad-
vertising copy, letters or other forms of composition does not
necessarily imply qualification to write satisfactory sub-titles.

ASSEMBLING — The most difficult part of the producing of
a motion picture is the cutting and assembling of the print.
Hundi'eds of directors are producing pictures which are really
made in the cutting departments. If a director is a good film
cutter and can follow the action of his picture on a pair of re-
winders, the producer has something to be thankful for.

Directors who can cut their own pictures are few and far
between. D. W. Griffith, Thomas Ince, Edwin Carew, George
Tucker and Edgar Lewis are a few great directors who cut their
own pictures, but it has taken them years to master this art.

The majority of directors make a child or a pet of pictures.
To them the eliminating of this episode or that unnecessary
scene is like cutting off the fingers or arms of a child.

If only directors would realize that a comedy situation is over
after the laugh and a dramatic situation, after the suspense, and
would bring the scene to a close, pictures would be easier to cut.

The use of close-ups in the midst of dramatic action is a mis-
take made by many directors.

In a certain picture a woman was roughly thrown to the floor
and as the man's hand grasped her. the director cut to a close-up
of the woman, thereby losing all the dramatic value and suspense
of the scene.

£04

CUTTING AND EDITING

Qose-ups are effective when used to depict emotion or thoughts
and as introductions. They are necessary for switchbacks or
suspense but should never be used when they break into dramatic
action.

There are few film cutters who try to cut and edit a picture
while watching it on the screen in a projecting room dictating to
a stenographer. Eliminating this scene, shortening that, trans-
posing this scene or that title, they think they are cutting the
picture properly. No man can cut a picture properly unless he
looks at it once or twice in the projection room and then per-
sonally goes over the entire film by hand, on a pair of rewinders.
Then when he comes to an unnecessary scene he can eliminate
it but first he must be sure lliat the next scene or title will not
break the continuity of action. If a scene drags or is too long, he
must ponder over that scene, sometimes imaging himself one of
the characters in order to think of a proper title. He personally
must insert the title so tliat it will seem to come from the correct
character when projected on a screen.

Dramatic switchbacks are a physical impossibility unless a
cutter personally arranges the scenes. If his assistant does this,
he is the real cutter and it is mere luck if he gets the title inserted
perfectly.

A film cutter must be able to write and originate comic and
dramatic titles. He must also know the proper color schemes for
each scene in order to cut the negatives properly when the posi-
tive print is ready for the laboratory.

205

EXTERIOR LIGHTING
Chapte* XIII

WHEREVER a camera has to be taken om for photograph-
ing at a distance, great care mu&t be taken to make
sure no essential part of the kit is left behind. Make
a list beforeliand of everything which will be required. A good
way of recollecting minor items of kit in danger of being over-
looked is to act over to yourself each stage of the work before
you, asking of every accessory : "Have I that on my list?" Thus:

I am going to raake scenic pictures. I pack the camera in
its case, strap up the tripod, and start. I take a taxi to the
railroad station. { Note : Have I money to pay the taxi, and buy
my ticket?) At my journey's end I select a good view and set the
camera up by erecting the tripod, screwing on camera, and at-
taching camera, tilting, and panoram handles, (Have I all three?)
Next I focus. That means focusing celluloid. I thread up film,
for which I require film and takc-up boxes and as many spring
clip hubs for the take-up spindles as there are charged film boxes.
I find the exposure with my exposure meter. Now to take the
picture. I place my hand on the camera handle, look through the
view Under (Have I this, too?) and the filming is done.

Write oi*t a full list of usually required accessories and keep
it where it can be referred to easily. The inside of camera door,
and the top of camera case are both good places for it : C^unera,
camera handle, camera tripod, film boxes, take-up boxes, ex-
posure meter, view finder, focusing celluloid, extra lenses, tripod
handles, film clip hubs for take-ups, soft rag and camel-hair mop
brush for dusting camera and lens, emery for cleaning gate, etc.,
etc.

Though good, correctty managed, lighting is a necessity of
high quality negative making, it bccon>cs a distinct art in scenic
work, therefore I shall deal with it more particularly under this
head. Three fundamental rules of lighting to bear in mind when
photographing any subject are that the light must be sufficient,
its quality must be actinic (it must be rich in the photographically
active blue and violet rays) and the source of light must on no

EXTERIOR LIGHT I N G

account shine directly in at the camera lens. Whether or not
the first two of these rules is fulfilled can best be decided by the
aid of an exposure meter. Dcddc the third point by common
sense. If the light source, usually the sun, is beating directly
into the front glass of the lens, the lens must be shaded by
means of a dark hood. If that is not practicable without cutting
off a portion of the pictiu^, the camera's position must be shifted.
Where this also is impracticable or undesirable, and the subject
is one which can be photographed at more than one time of day,
select a time when the direction of the sun will liave altered and
postpone filming till then.

To focus a dead sharp image of those objects which must be
sharp upon the film, and to make the focusing accord with a
near approximation of correct exposure, is a real stumbling
block to a great number of would-be camera operators. A man
who knows how to make focusing help exposure and exposure
help focusing must possess both considerable practical experi-
ence and a quantity of judgment.

To focus correctly:

Open the camera gate, remove film from film track and lay in
its place a length of three or four inches of matt celluloid.

Matt celluloid can be made from any clipping of old cinemato-
graph film. Soak the film in warm washing soda solution till the
emulsion softens. Clean off, and dry the cleanc<l base. Make
a paste of knife powder and water, smear it on a piece of glass,
lay the transparent celluloid down upon the paste and rub the
fihn in the emery by placing your fingers on the back and rubbing
with a circular motion. After a short while the celluloid will no
longer be transparent on the side that has been scratched. It is
then suitable for a focusing screen.

Next close gate firmly upon the matt celluloid, adjust focusing
tube and magnifier tight up in place, open light shutter of focus-
ing tube, place your eye to the end of it and, unless the rotary
camera shtitter is cutting the light from gate, you will see a more
or less clear image thrown by the lens. If no trace of an image
is visible a slight turning of the camera handle will make it so.

Turn the lens focusing flange, or rack, till the image becomes
quite sharp and then begins to become less sharp again. Then
reverse turning direction of the focusing adjustment till the
nnage once more sharpens Dp to its best In this way, the point

MOTION PICTURE PHOTOGRAPHY

of critical sharpness for the particular object focused upon is
found. If at first you have difficulty in deciding the critical
point, get a large white card and stick upon it criss-cross strips
of dead black paper. Stand the card up against the object you
are focusing. Black bars on a while groiuid are easiest of all
things to focus clearly.

Always do your focusing with the lens diaphragm open at its
widest aperture. Take careful note of the apparent brightness
of the piaure produced, as practice in this will help you a little
in judging exposure should you ever be called upon to do so
when you have not your meter with you.

Notice that objects nearer to, and probably also objects farther
from, the lens than the one focused upon are not sharp on the
celluloid but arc fuzzy.

To focus other objects with the principal object:

The object is not merely to focus a single subject sharp but
to adjust the lens at the same time so as to get reasonable sharp-
ness of objects both before and behind it

The method is the same whether we want subsidiary sharp-
ness in objects nearer or farther off than the principal one.

To focus a good compromise between principal and nearer
objects, first get principal object critically sharp, then rack out
the lens very slightly until a barely perceptible falling off in the
principal object is seen.

To focus principal and farther objects get principal sharp and
rack lens slightly in.

The amount of racking out or in to make correct compensa-
tion for depth of stage is very slight. Where possible follow it
by substantially reducing lens aperture. Always compensate for
depth first and reduce aperture afterwards.

One of the greatest difficulties encountered by the photog-
rapher, whether he wields a still camera or turns the crank of a
motion picture box, is that of exposure.

Gelatine emulsions are of different speeds and latitudes and
subject to deterioration. The celluloid base from which motion
picture film is made and which is also extensively used for film
cartridges, film packs and as cut films, reacts upon the cnmlsion
and causes it to gradually lose its sensitive qualities in much more
rapid ratio than that of emulsions coated upon glass.

An emulsion records the amount of light which acts upon it

EXTERIOR LIGHTING

in a definite mathematical ratio, but one emulsion may be "faster"
than another. For example, if two plates or pieces of film are
taktrn, one of which is twice as fast as the otlier, and both are
exposed for a short time at equal distance from a standard
candle, the faster emulsion will show a much greater density on
development than the slower one. If, however, the slower one
is exposed twice as long the two pieces will have equal density,

It is highly important in making tests of any character in
photography that every factor in making relative tests be re-
produced exactly or the results obtained will be false.

Development, time and temperature must be controlled exactly,
fresh standard developer being used for each test as it dete-
riorates with use; fixing, washing and drying times and tempera-
tures must also be the same. A test made in cold developer and
another in warm easily give rise to false conclu^ons in regard
to the speed of a film or plate. Many photographers have been
grievously misled in their conclusions in regard to materials by
inaccurate tests.

Inasmuch as different emulsions require different developing
times to record gradations of li^^t in their true ratio, it is
necessary to make preliminary tests to ascertain the development
time where it is not ^ven by the maker.

Where photometric instruments are not at hand for accurate
tests the simplest method of arriving at the proper development
time is to expose a strip of film giving relative exposures of i, 2
and 4. Cut the film lengthwise in three strips. If you think five
minutes to be about the normal development time, develop the
three strips 4, 5 and 6 minutes respectively. If you have been
lucky in your assumptions as to the s\)ctd and time, one of the
nine permutations obtained will be correctly exposed and de-
veloped, giving a basis for farther experiment. If the nine per-
mutations are all too dense, the exposures have been too long.
Try again with shorter exposures; if there is much fog or .stain,
he development may have been too long. Try again with
'shorter development. If the strongest exposure and longest de-
velopment is tiie best of the nine, try again with longer exposure
and longer development times.

Many methods have been worked out for determining proper
exposure. The following data is largely taken from material
collected by A. Horsley Hinton, formerly editor of the Amateur
Photographer.

MOTION

PICTURE PHOTOGRAPHY

The principal factors governing exposure are: (l) the speed
of the plait; (2) the actinic power of the sun's light for the
lime of year in a given latitude and its position at the particular
lime of the day; (3) the effective diaptiragm aperture of the
lens; (4) the nature of the subject and its illumination as affected
by local and atmospheric conditions. With others these data are
supplemented by, and practically based upon, actino-metric ob-
servations of the action of the light upon sensitive paper exposed
near the camera or the subject at the time. Both methods are
in many cases of undoubted use, but the information given by
instruments of this kind can only be considered as approximate,
and much is left to the judj^ent of the operator, whose surest
guide will be an intelligent study of the principles on which these
instruments are based, together with carefully recorded ob-
servations of the combined working of his lenses, shutters, plates
and methods of development under the varying conditions of
practical work. Before using any of these instruments it is
necessary to know approximately the relative sensitiveness or
"speed" of the plate or film in use. In the early days of gelatine
dr>' plates their rapidities were stated as so many times those
of wet plates, or (as they are still) "ordinary," "instantaneous,"
"rapid," or *'cxtra-rapid," terms which, though suitable for one
make of plate, may not be so for others.

In 1890, F. Hurter and V. C. Driffield introduced an entirely
new system of calculating the sensitiveness of plates of difFerent
rapidities. They make a series of exposures in seconds on dif-
ferent parts of the plate in geometrical progression with a stand-
ard candle at one meter distance. After development for a
certain fixed period with a standard developer, fixing, washing
and drying, the "densities" or logarithms of the opacities of the
different parts are measured by a special photometer and plotted
on a skeleton diagram, producing a curve, one portion of which
will be practically a straight line. (See the chapter on Negative
Development). The position of this line with reference to a
scale of exposures given on the diagram decides the rapidity
of the plate, while its length indicates the "capacity" of the plate
for tmthfu! rendering of lone.

It is to be deplored that no universally recognized system of
speed numbers has been brought into use, nearly every maker
of films and plates having some system of his own which bears
no relation to that used by other manufacturers.

EXTERIOR LIGHTING

Tlie H. and D. system is probably the most scientific one.

The sensitiveness shown on the H. and D. scale is directly
proportional to the ^eed number given. The method lias been
adopted by several dry-plate makers in denoting the sensitive-
ness of their different brands, and is more or less the basis on
which the plate-speeds for the modern dr>'-platc actinometers
and exposure meters are calculated.

Variation in daylight without clouds from morning until
evening (for latitude of Northern United States) :

MoRN[NG

January 3H

February 8

March I'A

April IH

May 1

June 1

July I

August 154

September 1J4

October 8

November 3J4

December iVi

V4 2

1^4 IM

2!4 3

Aftehnoon

The next important factor is the actinic power of the light.
It depends normally on the height of the sun for the latittode of
the place at the time when the photograph is taken, and exposures
in bright sunlight are found to vary approximately as the con-
secant of the sun's altitude above the horizon. The light of
the sun itself is practically the same at any given time and place
year after year, but is liable to more or less local and temporary
diminution by the amount of cloud, haze, dust, etc., present in the
atmosphere at the time. It is also affected by the time of day,
increasing from sunrise to noon, and then decreasing to sunset
The remaining factor is the effective diaphragm apcnurc of the
lens In relation to its focal length. In most cases of ordinary
out-door exposures this can be taken at its normal value^ but

MOTION PICTURE PHOTOGRAPHY

becomes smaller and increases exposure if the (ocal length is
much increased for photographing near objects. Besides these
principal factors, the nature and color of the objects, their
distance and the amount of liglit received and reflected by them
under various atmospheric conditions, have a great influence on
the exposure required.

HARVCV 1

HOTIDN PICTURE ■

EXPOSURE METER

-I- I- .U_J

I fe,i-j.-i-ULJ^

■n* •**• MiM Hm •>

Pig. 4a

The American Photography Exposure Tables arc the most
convenient and practical help in determining the correct exposure
for any subject, in any part of the world. An edition has been
carefully revised to include all the films and plates on the Ameri-
can market. In every instance the speed has been determined
by scientific tests by a renowned expert. The tables assign to
each factor concerned in exposure — subject, stop, light, hour
and plate — a number. These are found in the tables and added.
No multiplication is necessary. The sum is then looked out on

EXTERIOR LIGHTING

a final table, and opposite this number is found the exposure in
fractions of a second, minutes or hours.

Based on the same principle as these exposure tables, various
portable exposure meters have been brought out, in which scales
representing the coefficients for plate-speed, li^ht and diaphragm
are arranged as in a slide rule, so that, when properly set, the
normal exposure required can be found by inspection, and in-
creased or diminished according to circumstances.

The Harvey meter and the Burroughs & Wellcome meter and
handbook are for sale by every photographic supply house.

The Watkin*s Kinematograph meter is fitted with a pcnduJum
for counting half seconds and crank turns. It is made especially
for motion picture operators and is about the size of a small
watch. It gives a direct reading showing either the shutter
opening or diaphragm number required under the given condi-
tions.. It is sold by Burke & James, Qiicago, as are the Wynne
meters described bdow.

G. F. Wynne's "infallible" exposure meter is also in dial form,
but the sensitive paper is exposed directly, no pendulum is used,
and the scales are open on the dial. In use, the glass carrying
the movable scale is turned until the actinomdcr time in seconds
upon the exposure scale is ojjposite the diaphragm number of
the plate, as given in the list of plate speeds; the correct ex-
posure will then be found against each stop given on the scale.
There are practically only two scaJes ; the scale of diaphragms
representing the diaphragm or f numbers, the speed of plate
and the variation of exposure due to subject; and
the time scale, representing the actinometer time and
the exposure. The actinometer is protected by a yel-
low glass screen when not in use. In a smaller form the scales
are on the circumference of a locket, and the actinometer at
the back. An "Infallible" Printmeter is also made for showing
exposures in contact printing on sensitive pa|)ers, but can also
he used for testing speeds of plates and papers. Beck's
"Zambex" Exposure Meter gives the exposure and stop to be
used, also the depth of focus to be c^taincd with different
diaphragm apertures. The required exix>sure is set to the
"speed" number on the next scale of the meter. The third
scale corresponds tb the times of darkening the sensitive paper
in the actinometer attached to the meter, and shows the dia-

313

M O T T O N

PICTURE

PHOTOGRAPHT

phragm apcriurc suitable for the given exposure. Other icaks

fihow the distances that will be in locus with the different itap&
used, arranged so tliat the focal depth of four dsSercnt IcMCS
can he found. Several other exposure meters are made oo tbe
principle of the slide rule, with scale corresponding to the £acloa
of "plale !tpe«l," "diaphragm number," "light," "exposure." wad
the exposure is found by simple inspection without an actinis-
nicter. They arc designed for use with particular brands of
pIiitcR, hilt can be used for others of similar speeds.

TIm: last types of meters described depend for their ti^
trwanurcmetit upon matching a tint or shade, a rather difficult
innttrr for mofit iiersuns. A new instrument based on the same
principle, but which docs not require the tint to be matched, is
llir Sinidmau Aahainctcr. It may be obtained from any photo
BUpf)Iy dealer. It consists of a series of graduated openiiy
which give a ratio of exposure upon a strip of sensitized paper
in the progression of i, 2, 4, 6, 8, 16. The number of grada-
tions ri!Cordc<l in a given time gives the light strength and refer-
ence to a simple chart tabulated on a card, and gives the proper
exposure at a glance.

Another class of exposure meters comprises those in which the
intensity of the light is estimated visually by extinction through a
semi-transparent me<liuin of increasing intensity, such as J.
Decoudin's, in which the exposure is judged by the disappearance
of a series of small clear oi)enings on a graduated scale of den-
sities when lairl on the most important part of the image as seen
on the ground-glass, lis indications are not very definite, and
the proper scale changes in density after a time. A better form
is '*K. Dcgcn's Norma! Photometer," consisting of two slidit^
violet glass prisms, one a<ljusted for the diaphragm apertures,
the other for the actinic illumination of the object. They are
mounted with their outer faces parallel.

In use t1ic upper slide with prism is drawn out so that the
pointer coincides with the division indicating the diaphragm aper-
ture to be used: the object to be photographed is then viewed
directly through openings at one end of the instrument, and the
lower slide is drawn out and pushed back slowly till the object
viewed is almost obscured. The attached ]x>inter will then in-
dicate tlie exposure required, or, reversing the order, the dia-
phragm aperture for a given exposure can be found. Auxiliary

EXTERIOR LIGHTING

scales are attached for very short or very long exposures. The
principle of construction is that the logarithms of the times of
exposure are proportional to the thickness of the colored prisms.
"G. Heyde's Ac lino- Photometer" is on a soniewliat similar prin-
cipal, and consists of a circular metal box with dark violet glass
viewing screens in the center of both sides^ with obscuring iris
inside the case worked by revolvinj; the back of the box. On
the front of the instrument exposure tables are given for plates
of every rapidity, and for diaphragm apertures from f/j to f/45-
Exposure meters of this type are specially applicable for open-
air work where there is sulficient light (or ready measurement.

Practically all of thL' conuncrcially sold meters give the ex-
posure in a manner suitable for still camera work, which is
seldom convenient for the cinematographer.

The following table gives the diaphragm number and shutter
opening graduated from the exposures usually graven for still
camera work. Where longer exposures are recorded for still
cameras it is not possible to get full exposure with the motion
camera. It is understood that the calculation originally made
with the meter is for a still camera using plates of the same
relative speed as cine emulsion, which is as fast as the fastest
plates ordinarily used in stand cameras, the only exception being
the ultra-fast plates sometimes used for Graflex work.

Table of Comparoiivc Exposures for StiU and Motion Cameras.

sec
Still camera at fl« 1

Motion camera:

sec

1/4

1/8

1/lB

1/32

1/48

F3.5

F5.6

F3.5

F8
F5.6

Fll
F8
F 5.6

Flfl

Fll
F8

Fas

Flft
Ftl

J4 opening shutter F3.5

(^ opening -ihuttrr

^ opening shutter

for y^ opening shutter the diaphragm should be set half way
between the reading for the yz opening and the reading for
}i opening.

With a little calculation almost any reliable exposure tables
may be usbd for the motion picture camera. As the shutter re-
volves sixteen times per second it requires one-sixteenth second
for the shutter to turn once; if it has an opening which is one-
half of the circiunfcrctKC the exposure givoi is one-half of

MOTION PICTURE PHOTOGRAPHY

■

^^H one-sixteenth or one-thirty-second ; a one-third opening, onc-

■

^^H forty-eighth, etc Now the diaphragm numbers on a. lens, ^^

^^H whether they be U. S. or F system, arc arranged so that each M

^^H higher number gives just half the exposure of the one below it. ^H

^^^^—^ Also, U. S. i6 and F i6 are equal. Now let us figure: Suppose ^H

^^^^^V An npoture chart for motion picture work ta s>vcn here. ^^|

F system is used.

^^^^H

^^^M

A.M.

10-11

9-10

8-9

7-S

6-7

5-6

^^^H

Month and Weather

and

^^^H

1-2

3-4

4-5

6-7

P.M.

^^^H

Jan.,

Hazy Sun

■

Nov., Dec.

Diffused light . .
Dull

5.6

3.5

5 6

Very Dull

Bright Sun- . . . -

^^^H

Haxy Sun

5.6

5 6

Feb., Oct.

£>iffused light . . .
DuU

8
6.6

5.6
4

4
3,5

4
3.5

Very DuU

3.5

Bright Sun

^^^B

Mar., Apr,

^^^H

Aug., Sept.

Diffused light.. .

S.6

^^^^H

DuU

5.6

■

Very DuU

6,6

5.6| 4

3.5

Bright Sun

5.6

^^^H

May, June,

22 26

6.6

^^^H

Diffnswl hght . .

16 I 11

6.6

3.5

■

DuU

11
8

8
£.6

3.6

Very DuU

^^^B

)ur table of exposure says that under the conditions that obtain

^^H where wc wish to work that the norma) exposure is one-fourth 1

^^f second at U. S. thirty-two. The next lower stop is U. S. 16, 1

^^H which is twice as fast, therefore, at U. S. 16 we can expose in 1

^^H one-eighth second. Now our cinematograph lens is perhaps 1

^^H marked in the F system. F 11 is next below F 16 with an ex- ^J

^^H posure of one-sixteenth second. The most we can give is one- ^^|

^^H thirty-two second with our shutter as far open as we can use it, V

^^H we must open our diaphragm still further in order to get enough ^J

^^^ light through our leas to make the i>icture in one-tbirty-two ^H

^^^H ^^1

B . . M

seconds. F 8 is the next diaphragm number giving an exposure
in half the time as F il ; one-half of one-sixteenth is onc-thirty-
two, therefore, if we set the diaphragm at F 8 and turn at normal
speed wc will liave a correctly exposed negative.

In regard to exposure in back lighting: In calculating exposure
for back lighting it is usual to calculate the exposure for the
lower tones in the picture, as the high lights where the sun
strikes are always over-exposed. It is practically always neces-
sary to use a lens hood or some sort of shield to protect the lens
from the direct rays of the sim. When the sun sets low enough
to be included in the picture it is then usually too dark for back
lighting, and the eflfect then becomes either silhouette or moon-
liglit effect. It is customary in most back lighting effects to
light up the shadows by an inclined reflector placed between the
foreground and the camera. Back lighting generally takes two
to four times the exposure necessary in the same light when
used in direct lighting.

This chart is calculated to give full shadow detail, at sea level.
42" North Latitude.

For altitudes up to 5,000 feet no change need be made. From
5,000 to 8.000 feet take J4 of the time in the table. From 8,000
to i2,ooo feet use J^ of the exposures in the table.

Exposure for average landscapes with light foreground, river
scenes, light colored buildings, monuments, snow scenes with
trees in foreground. Tlic data compiled for use with Eastman's
standard motion picture film and cemeras with 50 per cent
shutter opening.

The exposures given are approximately correct, but usable
negatives can be obtained with ^ and ^ less time where it is
not possible to give more on account of small aperturcd lens or
% opening shutter. Allowance should be made, however, for
smaller shutter opening whenever possible.

Forty-two degrees North Latitude is that of New York and
the Northern States. For Southern Canada use next larger
sized stop and in the winter months perhaps two sizes larger.
For Southern California, Florida and the Southern States, the
next size smaller wilt be sufficient generally except in the early
morning and late evening hours, when the opening shall be ac-
cording to the chart or even increased. When the light is red
or ycUow where the indicated stop numbers are underlined, the

217

MOTION

PICTURE

PHOTOGRAPHY

diaphragm opening must be increased to the next or even to
the second or third opening beyond that indicated by the chart.

The nimibcrs given in the chart indicate the diaphragm open-
ing necessary under the F system, which is the system used in
marking the diaphragm opening on nearly all cinematograph
lenses. They are F 3.5, F 4. F5.6, F 8, F ii, F 16, F22, F 32—
each succeeding number in this series giving one-half the expos-
ure of the one preceding. Other intermediate numbers are some-
limes given, but not often, and may be disregarded practically
when using this chart. In the following classification of subjects,
the diaphragm opening should be modified from tlie one given in
the chart according to the direction given after each class.

For example, we wish to make a picture in June, at four
o'clock in the afternoon, of some red brick building on a hazy
day. Under June we look in the hazy sun column and o^ipositc
the time we find the exposure to be F 16. For this classification
the increase is two points, or F 8.

Subjects — For other subjects modify the exposure for an
average landscape as given for the class of subject.

Class A — Studies of sky and white clouds. Decrease opening
three points.

Class B — Open views of sea and sky ; very distant landscapes ;
studies of rather heavy clouds; sunset and sunrise studies. De-
crease opening two points.

Class C — Open landscapes without foreground; open beach,
harbor and shipping scenes; yachts under sail: very light colored
objects; studies of dark clouds; snow scenes with no dark ob-
jects ; most telc-photo-subjects outdoors ; wooded hills not far dis-
tant from lens, Decrease OIX^ning one point.

Class D — Landscapes with medium foreground ; landscapes in
fog or mist ; buildings showing both sunny and shady sides ; well
lighted street scenes: persons, animals and moving objects at
least thirty feet away from the camera, increase opening one
point.

Class B — Landscapes with heavy foreground; buildings or
trees occupying most of the picture; brook scenes with heavy
foliage ; shipping about the docks ; red brick buildings and other
dark objects; group outdoors in the shade. Increase opening
two points.

Chaptbk XIV
INTERIOR LIGHTING

TWELVE years ago ihere were proliably only five studios
for the production of films where there arc now more than
one hundred. The large amount of money which has
been made in this indusir>' and the possibilities of future profits
have drawn capital for the formation of new enterprises from
various sources, and with the creation of so many new companies,
competition has become keen, and the cost of producing films has
become an important factor.

In the making of a picture the costs may roughly be divided
into: cost of raw film; interest and depreciation cliarges on
buildings and equipment; salaries of directors, actors and me-
chanics; cost of developing: and printing, and the cost of lighting.

Just what relation these various costs bear to one another is
doubt ful» but it has been stated that completed films cost to
make anywhere from 50c. to $5.00 a foot, the average being
approximately $2.00 per foot.

The raw film itself costs aboirt 3J4 cents per foot
for the negative and 3 cents per foot for the positive
Naturally the highest cost is for labor, and in this respect the
moving picture industry does not differ materially from many
other manufacturing processes. Any manner in which labor
costs can be kept down and labor utilized to its fullest capacity,
is bound to decrease the cost of the film and increase the profits
of the manufacturer.

One item which tends to help utilize labor to its fullest extent
is proper light. The first maxim in the studio is that "no picture
can be made without proper light and plenty of it." SuiBcient
light has to be provided, whether it be daylight or artificial light,
to take clear pictures in approximately 1/50 of a second. They
must be taken with detail, as they are projected to a magnifica-
tion of about 150 diameters on the screen, and the public is be-
coming more and more critical regarding proper definition of the
subject projected.

The stop ttsed b generally about f 4-5 with a 3-inch lens, and

230

INTERIOR LIGHTING

if there is not an abundance of light, the picture will not be satis-
factory when the camera is working at the required speed.

The indoor studios depended on daylight for their lighting
by the use of glass skylights ; later, studios were constructed not
only with overhead lighting, but with the sides also of glass.
Even under these conditions, on rainy or cloudy days, or about
three o'clock in the afternoon during the autumn and winter
months, the daylight available was insutBcient to produce good
pictures.

At about this period the Cooper-Hewitt Lamp had been de-
veloped, and its high actinic values were justly appreciated by
the few studio managers who were then in the business, and an
installation of these lamps was made in 1905 at the Biograph
Company's original studio on 14th Street, New York City.
From this installation has come ihe practical development of the
Cooper-Hewitt Lamps for the moving picture stage.

Few people who see the films on tlie screen appreciate what
has to be done to take even the simplest scene, after a scenario
has been accepted by a company and turned over to the director
who is the successor of the stage manager. The actors must
be selected for the various parts and given instructions ; scenery
must be found for the setting, or if necessary, new flats, etc.,
painted, and erected on the stage. The necessary "props" must
be obtained, and after rehearsing the scene time and again tmtU
the producer is satisfied, he calls for "Lights'* and then for
"Camera," and the picture is taken. Fifty or sixty feet of film,
which require about one minute to photograph, may have taken
two or tlircc hours to rehearse. All scenes occurring in tlje
same set are generally taken one after another irrespective of
how they occur in the scenario, and after developing, the sec-
tions of the films are jointed together in their proper places.

The importance of light is emphasized by the statement that
no matter how good the scenario may be, or how well it may
be worked up. the result of the eflforts of the producer and
actors will not register clearly and accurately on the film if the
action is not properly lighted.

One of the most efficient ways to light a stage either wholly
dependent on artificial light or using it in conjunction with day-
light is by means of Cooper-Hewitt Lamps arranged in banks.
say, eight tubes. Hach of these banks throws a mass of light

221

MOTION PICTURE PHOTOGRAPHY

Upon the scene similar to that from a fair size window or
skyhght.

The Cooper-Hewitt Lan^ is particularly desirable for this
class of work on account of the great actinic power of the light ;
for equal illumination, it being about the same as daylight. Also
the fact that the light comes from a long tube in place of being
concentrated in a small point, ensures thorough diffusion of the
light and gives a lighting effect similar to daylight. The light
blends with daylight, and where used in a daylight studio can
gradually be added as tlie daylight decreases.

Even with two or three hundred lantps on a stage there is very
little glare, and no harmful effects are produced on the eyes of
the actors, Furthermore, even with this targe amount of light,
the temperature of the stage is only slightly raised above the
surrounding atmosphere. This is a most Important point to
be considered in taking pictures, and especially in fairly long
scenes, as the fatigue produced by an excess of light will pre-
vent the players from putting forth their best efforts.

Lamps are frequently arranged in skylights for hanging from
the ceiling to provide top Hght, and floor stands are added to
take care of the side lighting and reinforce the lighting at special
points to obtain the best effects. By properly arranging the
lights around the sides of the stage and overhead, modeling
effects can be produced which do away with the flat pictures apt
to result from improper lighting.

As an instance of the manner of lighting a studio for large
stage work, we may take a stage of about 32 ft. deep. In a
typical installation of this type there are 208 tubes, 136 for over-
head lighting and 32 for high side lighting, with 48 mounted in
floor stands for moving about to throw the light from one side
and towards the front.

The overhead lamps are arranged in the following tnanner —
Eight tubes in two banks are hung approximately 8 ft. over the
front line, at an angle of about 30 degrees inclined toward the
stage: back of these lamps are hung three banks of eight lamps,
each at the same angle, and this idea is carried out so that at
the back line there are four banks, at about 18 ft. above the
stage, this fan-shaped method being essential to cover the stage.
On one side are four hanging banks which are inclined 45 degrees,
throwing the light in on the stage. No lamps are placed op-

»a

postte to these, for the reason that if the illumination was
equalized the picture would photograph flat. The floor-stands
arc placed at various positions to get light in on the stage to
light up spots where the top and side lighting do not reach and
to produce artistic modeling.

The overhead lamps in this studio are all suspended from a
trolley system which permits the tamps to be removed from one
end of the studio to the other, and cover in this manner three
different stages. By this method scenes can be set up on two
stages while pictures are being taken on the third, and no time
is lost between the taking of the scenes.

The overhead structure for this work consists of three tracks
running the entire length of the studio. On this track are run
a number of grooved wheels which are linked together by three
angle iron frames. From these three frames are suspended by
chains, the skylight banks and their auxiliaries or starting ap-
paratus. The iron frames arc controlled by endless wire cables
running from one end of the studio to the other, and which are
connected to winches, so that the overhead frames can be moved
about very readily, when desired, by turning the handles.

The wiring is nm to a panel board, mounted at one side of the
studio, and this panel is arranged so that all of the lamps can be
thrown on at one time, or by a system of double throw switches,
by throwing certain switches, any number of the lamps can be
left on, the balance thrown off, or vice versa. This arrange-
ment permits the dimming of lights for night scenes, or by throw-
ing on all, gives the impression of the sun coming up, or the
turning on of lights in a room.

In addition to Cooper-HewJtt Lamps a studio should have a
number of arc lamps, several spot lights, which can be used in con-
junction with the tube lamps for spot lighting effects. More-
over, arc lamps arc used for fireplace lighting, table lamps, and
Other special effects.

Arc lights are also often used without the admixture of Cooper-
Hewitts, as many effects can be produced with them which can-
not be obtained with the diffuse illumination from the mercury
tubes. The following paragraphs about "liard" lights arc an ab-
stract from a paper on "White Light for Motion Picture Photog-
raphy." delivered before the Society of Motion Picture Engineers
by William Roy Mott, of the Research Laboratory of the Na-
tional Carbon Company, Inc., Qeveland, Ohio.

223

TION PICTURE PHOTOGRAPHY

The famous psychologist, Professor Munsterber^, wrote a few
years apo a book on moving pictures and in it he asserted that the
production of moving pictures by the best companies had grad-
uated as an art ranking with painting, sculpture and music. By
attention to mode and variation of lighting, many new psycho-
logical appeals can be made, including the portraying of the
thought images in the minds of the characters of the play, some-
thing impossible to duplicate on the theatre stage.

Besides being one of the fine arts, the moving^ picture art has
become the greatest educational institution in the world. Very
special lighting is needed for scientific films, for ultra-rapid
moving picture work and for the several new color processes.

The moving picture industry is one of our foremost industries.
Since Edison's and Jenkin's invention of moving picture devices
of only a score or so years ago, the industry has leaped to fourth
place in the United States. There is spent annually three or
four hundred mtlHon dollars by the people here for admission to
moving picture theatres. The daily attendance is said to average
between ten and twenty millions of people. Of the fifty
thousand motion picture houses in the world, there are 'about
twenty thousand in the United States and the United States is
the greatest producing center in the world. The sunshine of
California has built up a major producing center in and near
Los Angeles. There over twelve million dollars are spent an-
nually for this production and about twenty-five thousand people
are employed.

Tlic importance of light in relation to expense of production
may be judged from the following statement made by Mr. G.
McL. Baynes of the English Hcpworth Manufacturing Company.
"As to photographic difficulties encountered in outdoor work
in England, it is ridiculous to say that they cannot make pictures
there. It is true production is more expensive, perhaps hvicf
as much, because we have to wait for the sunshine." Thus in
foggy England, the difficulties are much greater on account of
poor light than in the West or East of the United States.

The invention of the high average white flame arc lamps and
carbons and of other artificial light sources such as the daylight
gas filled tungsten lamps and the mercury arc lamps, have elimi-
nated these expensive waits for sunshine.

The home-center of Uie moving picture industry in the East is

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INTERIOR LIGHTING

again building up rapidly. There new studios are to be found,
especially in or near New York City and to a lesser degree near
other centers of population, in Chicago, Philadelphia, Clcvdand.
Scenic interest is another industrial factor which accounts for
their location in Ithaca and Florida.

The increase in artificial light facilities has been an important
economic factor in this Eastern movement which is being ac-
celerated by the continual increase in the extraordinary salaries
which are paid moving picture artists. The cost of production
oi an average negative of one reel is said to be about $1,000,

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and of this it is certainly economy to spend one or two per cent,
on securing the best lighting'.

The lighting differences between the theatre stage and movie
stage are illustrated by Fig. 44 which shows the theatre stage has
a broad front line, below which come the footlights and a very
shallow background, because the essential action of the stage
must be visible to every one in the audience on both sides of the
auditorium. On the other hand, the moving picture photog-
rapher can select any point of view and this necessarily has an
enlarging background in the usual case of real scenery. The
camera lines in the ground view (Fig. 43) represent limits outside
which the lighting units must be placed, except for trick flame
lamps used to imitate lanterns and house lamps. In the vertical
plane exactly the same rule must be followed in regard to in-
creasing light of overhead lamps for the background. The ex-

225

MOTION PICTURE PHOTOGRAPHY

cellent results from footlights has not yet been appreciated by
moving picture artists.

Motion pictures became commercially successful for entertain-
ments only when it became possible to select a subject, stage it
with all the startling realism of the spoken drama and give its
photography those qualities perhaps best connoted by the tenn,
"portraiture."

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Floor piaa afaowhifc theatre state U verj shallow, kr^ haa «
deciraaiiig widlb of Back-Ground.

"or portraiture efFccfs — Rembrandt, line lighting, etc., control
of the position, direction and diffusion of light is necessary.
Some hghting forming an oblique angle on the face to the camera
gives increased reflection and aids in preventing flatness. For
artistic results, the white flame arc is distinctly superior for
securing nn^deling, atmosphere, definition, half-tone and fine
photographic quality in the negatives.

Mr. Max Mayers, in his valuable paper on "Artificial Light in
the Motion Picture Studio." given before the Society of Motion
Picture Engineers, says, "Back lighting is a splendid way of
obtaining pleasing and natural results. This is effected by plac-
ing the lights well back and directing them toward but not at the
camera, masking the direct rays at the lamp, and preferably using
a shielding tube with perfectly dull black interior over the lens

226

INTERIOR LIGHTING

barrel, to pnevcni halation. Thus the figures and objects in the
set will be silhouetted, and by the proper front arrangement of
reflecting surfaces and well diffused lights at a fair distance,
the features and details may be perfectly modeled in shadow,
with pleasing hig^hlight relief effected by the rear lights."

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A large amount of light is required in moving picture work,
because of the short exposures (1/30 to 1/50 sec) and need
for definition. In the interest of definition and depth of focus
it is highly desirable to work at small lens opening. For instance,
with the white flanie arc lights f 5.6 is often used in moving
picture studios whereas f 4.5 and even f 3.5 have been recom-
mended with other sources of artificial light. Some of the flame

S87

MOTION

PICTURE PHOTOGRAPHY

lamps, with their reflectors and diffusing screens, can be used
to give a light intensity of 10,000 and more candles per square
foot, so that even daylight is surpassed, if so desired.

We will now consider daylight. The larger the number of
days of good, clear sunsliine, the lower is the cost of moving
picture production, because of the saving of time of high salaried
artists. But little has been done as yci to use artificial light in
conjunction with outdoor scenes for which daylight is ideal
except for the interruption of the photography by dark, cloudy
days. In England some use of arc lamps has been made for
outdoor scenes. Even on consecutive clear days there may be
a large variation in actinic light as shown in Fig. 45.

For interior scenes daylight must be diffused to avoid out-
door appearances caused by the direct shadows from sunlight.
This diffusion is secured by using prism glass in the roof and
sides of studios. If the studio work for interior scenes is done
outdoors then awnings of light-sheeting or muslin are used to
secure proper diffusion. This is sometimes done in studios with
glass roofs, especially if clear glass has been used.

A serious objection to daylight in such studios is the hot -house
effect, especially in summer. As these glass houses receive con-
tinuously one to two-horsepower of solar energy per square
yard of projected area nonnal to the light, the heating effect is
many times greater than with good artificial light alone, because
the full amount of artificial light is used intermittently and
seldom for more than a total of ar hour a day.

The artificial light, used generally for side illumination, with
daylight should be given by the light of the greatest photographic
power in proportion to the energy liberated in the studio. For
this reason flame arcs arc commonly used with daylight. In
the winter daylight Is rather poor after penetrating the glass
and screening and so dependence is then largely placed on arri-
ficial lighL

This seasonal variation and hourly variation of sunlight and
skylight is shown in Fig. 46, taken from Edcr's Flandbuch der
Photographic. Again the changing direction of sunlight has
been a serious objection and the studio, known as the Black
Maria, of the Edison Company was arranged on wheels so that
it could be moved to face the light.

Finally there is one class of interior scenes for which daylight

&2a

1 to.

INTERIOR LIGHTING

in any form is entirely unsatisfactory. This is in night scenes,
where sharp shadows and brightly illuminated parts must come
in the same picture. Again all moving picture work in actual
interiors such as subways, mines, caves, hotels, theatres, churches,
etc., must be done with artificial light. This brings us to the
vital importance of artificial lights. And of these the closest
to daylight photographically is the lighi of the while flame high
amperage arc lamps.

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The white flame high amperage arc gives a Hght which is re-
markably close to daytight both in color and photographic values.
Like daylight the spectrum is not entirely continuous, but the
efiFect of being practically continuous is obtained by the enormous
number of light giving lines in every part of the spectrum, in-
cluding the ultra-violet which with the white flame arc is very
similar to that given by sunlight.

This duplication of daylight is so good and the intensity of
light is so great that this light is being used by large clothing
concerns as a reliable substitute for daylight in making dye
fading tests. In fifty hours of testing with the flame arc. dyes
are faded to the same degree as by about three weeks of ordinary

MOTION PICTURE PHOTOGRAPHY

daylight in June in Cleveland. The white flame arc is also used
ior color matching.

It is a part of the higher management of moving picture pro-
ducers to give the actors and actresses a background of reality
and not of ghastly unreality. Producers favor the use of music
to lend realism and to create a desired emotion. "The living in-
terpreter must have the living scene lo do his best."

It is now a recognized fact that pleasant scenes need pleasant
h'ghL White light is the best for ordinary drama and comedy.
A blue or blue-green light is especially good for very sad scenes,
such as death-bed scenes. Mr. Edward L. Simons at a time
even before the use of flame arcs, pointed out the effect of blue-
green light on the actors by saying "but without the arc lan^,
it would be pretty hard to go througli a real love scene, because
everybody would look sick." Hence the value of tlie red content
of the white light is of great importance to moving picture pro-
ductions. Although photographically of no value for ordinary
purposes, it is of value in giving the artists a suitable environ-
ment for their best artistic expression. When film is sensitized
to long wave lengths then the red- and yellow light are important.

A few hints here about "make-up." The moving picture artist
soon learns that red will photograph black because the ordinary
film is not sensitive lo red light. For this reason the make-
up should be light, little rouge being used. Gold teeth or fillings
will photograph dark. An excessive amount of white clothing
should be avoided as this may give rise to halation which results
in a blur. Hence yellow, gray and other colors of clothes are
used. This halation needs to be watched carefully with the
lights having low latitude on plates. This means the picture
will show parts highly lighted and dimly lighted with dear
definition.

In regard to film sensitiveness the ordinary moving picture fUm
has a maximum sensitiveness in the violet with considerable sen-
sitiveness in the blue and ultra-violet and nuich less in the green
and yellow and no sensitiveness in the red. Some moving
picture laboratories are making orthochromatic films fairly sen-
sitive to yellow light. For panchromatic photography and color
photography, of course, all parts of the light are used. Because
of the use of a yellow screen with these, special flame carbons
can be used not only to give more light, but such light that a

INTERIOR LIGHTING

screen of better transparency can be used. This, of course, is
very important because color photography film calls for a great
deal more light for moving picture work than ordinary films.
The yellow flame carbons with special screens have been found
very good in motion picture production. Calcium fluoride ls used
and gives a spectrum rich in red and yellow bands with very little
spectrum yellow.

The flame arc shows a rapid increase in actinic light with in-
crease in current. In fact the flame arc with doubling of the
current at the same arc voltage increases its photographic effect
not twice but three to four times. This makes it profitable to
use the flame arcs at high amperages of 15-25 to 35 amperes. In
some cases much higher amperages have been used.

A vertical flame arc is generally preferred, but the arc will
bum well in a great variety of positions. In general, flame
upper carbons and flame lower carbons are used in moving
picture flame lamps so that the lamps can be used on either direct
or alternating current and without any regard to polarity if it
is direct current. This arrangement is different from the photo-
engraving field where a very common trim Is a neutral enclosed
arc upper carbon with a white positive Imver. In this case the
flame carbon nuist always be made positive because the flame
chemicals travel through the arc stream from the positive crater
to the negative crater. It is the flame materials that produce the
light and wrong polarity or pure carbon open arc gives about one-
sixth the photographic light of the white flame arc. However, a
positive flame upper carbon gives better efficiency with a flame
negative lower as against a neutral negative lower.

On alternating current, both carbons should be flame carbons,
as here the flame material feeds from both electrodes, and so
this arrangement gives the maximum efficiency. The use of re-
actance ballast on alternating current lamps in place of resistance
ballast increases greatly the eflSciency of a white flame arc for
equal power in the arc, and gives from 50 to 100% more light
for equal power on the line. With reactance ballast on two or
three flame arcs in series on no volts, the overall power factor
is better than .85. Three flame arcs in series on 100 volts with
metal coated carbons give but very little if any more effidency
than two flame arms in series.

We will now consider some of the typical flame lamps used in
moving picture studios.

831

tiOTION PICTURE PHOTOGRAPHY

Special flame lamps have been developed to operate on A, C.
or D. C and in scries on 220 volts or in multiple on no. This
makes the lamp of universal use, and calls for no special atten-
tion to the electrical conditions. The resistance of the flame
lamp to mechanical shocks, electrical shocks such as over-voltage
and to bad weather conditions, has made it universally used for
outside moving picture work. Combined with all these ad-
vantages is the remarkable small weight of these lamps. For
instance some of the twin arc lamps weigh no more than 20
pounds for Hghts giving 8,000 or more horizontal candle power,
and with the light of a little greater actinicity than daylight.
The amount of light is probably greater in proportion to weight
than any other artiBcial light used in moving picture studios.
Further improved design can greatly reduce this weight.

We will now <Iiscuss briefly a number of typical high amperage
flame lamps. The following flame lamps are commonly used:
Allison and Hadaway, Aristo, Boguc. Qticago Stage Lamp,
Joyce, Klieglight, Macbeth, Scott, Simplex, Sunlight. Universal
and Wohl. As there is no article or book where these t>'pes
have been shown collectively, no doubt the following will be of
interest.

The Aristo lamp is an enclosed arc lamp which has been much
used by portrait photographers and in motion picture studios.
In the latter one frequently finds the Aristo lamps, white flame
carbons ^ x 12 inches upper with >4 x 6 inches lower with or
without the globe. The greater diffusion of the light and re-
liability of the flame arc immediately found great favor with the
photographers of moving picture concerns when demonstrated a
few years ago by Mr. A. D. Spear, at Edison Studio. The
amount of light with 28-A and 63 arc volts with flame carbons
was 5,130 tiiean spherical candlcpower in the tests made.

The Allison and Hadaway lamp is a twin arc designed especially
for portability in a suitcase form. There is also made by this
company a diffusing cabinet with flame lamp and a small portable
flame lamp with shunt control to greatly raise the current at
the time of taking the pictures. The horizontal candlcpower
of the 15 ampere flame lamp is said to be 8,000.

The Chicago Stage lamp is unusual in having the flame car-
bons at right angles.

The Joyce flame arc lamp has been used somewhat in industrial
motion picture work.

INTERIOR LIGHTING

The Klieglight, Fig. 47, is a high amperage (30 to 40 amperes)
lamp, with horizontal carbons. The lamp is mounted on a ped-
estal with casters, and is used for side lighting. The lamp is
very powerful and so is usually diffused by a large glass screen.
A low weight lamp with vertical flame carbons is also made. Tlie
portable Klieglight is shown in Fig. 48.

The Macbeth Company is welt-known in the photo-engraving
field, and have recently produced a tilting lamp, which is ap-
parently of considerably greater efficiency than their usual photo-

Fig. 47

KliefliEbt Slant). SS-Sfi ampere with horizontal flame carboiw.

engraving lamp. The lamp is designed so that the light can be
directed to any part of the stage, both vertically and horizontally.
The tilting lamp is designed to bum an A. C. and D. C. and in
case of 220 volts, two in scries.

The Scott lamp is a revival of the inclined gravity feed lamp
at 15 to 20 amperes, and has two arcs in series in each lamp.
This lamp is especially used for overhead Ugliting, and in a stand
form for side lighting. These lamps give a greater effect by
40% than some of the flame arcs having only one arc on 1 10 volts.

The Simplex lamp is a twin flame lamp which is easily portable
and can be carried around in a suitcase. This lamp is designed
for 15 to 25 amperes.

The Universal or Majestic lamp has two flame arcs in series

«n

INTERIOR LIGHTING

and these arc placet! next to the economi2er. The lamp can
easily be directed to throw its light to any part of the stage.

The Wohl Duplex hanging lamp has two dame arcs in series
and laboratory tests have shown a mean spherical candlepower
of 6,700, with no reflector, with the lamp taking 30 amperes on
1 15 line volts (direct current). With the reflector, the horizontal
beam candlepower is 22.000, according to tests made. In mov-
ing picture studios these lamps arc provided with suitable woven
glass diffusing screens or large tracing clolh diffusing screens.
TTie Wohl Broadside is a stand lamp taking 30 amperes with four
arcs in series on 220 volts or 60 amperes on 1 10 volt line with
two pairs of scries arcs. A portable light weight lamp is
also made. A complete description of all the American Iami>s
would fill a book, so we will pass on to foreign lamps and spot
lamps.

The foreign makers of white flame lamps have lagged con-
siderably behind the American manufacturers. An English flame
lamp called Truelight. is interesting because four arcs are used
in scries on 220 volts, with the current reversing direction at
each arc and carbons changing size to maintain a focusing effect.
Some of the early German flame lamps are shown in Eder's
Handbuch der niotographie. They can be of no importance
compared with the American lamps.

Another type of flame lamp is the spotlight lamps operated
usually by hand. These are used in the same way as the ordinary
theatre spotlight lamps, but unlike the theatre lamps, the carbons
used should be the white flame photographic carbons or the
white flame searchlight carbons. Some movie directors have told
the writer tliat using the white flame photographic carbon in-
creased the photographic light about six times compared with
ordinary projector carbons. The white A. C. projector carbon
is not as efficient for studio lighting as the white flame photo-
graphic carbon.

The flame searchlight has also entered the moving picture field
with great success. It is often operated fifty feet away, and
with current 120 to 150 amperes. We will next consider home-
made flame lamps. Electricians in moving picture studios have
to continually devise new effects for simulating lanterns, indoor
lamps, fires, etc. Tn general, it is a great mistake to make an
article if it can be found on the market : but there are times when

MOTION

PICTURE PHOTOGRAPHY

it is an advantage to know how to make a flame lamp out of
other lamps.

For some purposes a cheap lamp with adjustable current for
changing the amount of light is convenient. In Figs, 49 and 50
arc shown the electrical arrangements that the writer devised
several years ago for doing this. The globes should be removed

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from the lamps and where necessan- the lower holders should
be made rigid. All the electrical wiring should be arranged on
one side of the arc, and then a resistance (or reactance can also
be used on A. C.) is connected in shunt to carry 15 to 20 amperes
at 50 volts around the lamp resistance and solenoid ordinarily
taking only 5 to yVi amperes. Half-inch white flame carbons,
metal coated at the holder ends, give excellent results. It is easy
to work two converted enclosed arc lamps with the two flame arcs
in series on 1 10 volts.

MOTION PICTURE PHOTOGRAPHY

and color photography. The color of its light is very dose lo
that of ordinary sunshine. The yellow flame carbon gives a
light rich in red and green but having comparatively little spec-
trum yellow or blue. The sensation of yellow light is produced
by the combination in the eye of the red and green Hght, The
violet in this light is fairly strong. The red flame arc gives a
Hght rich in red and spectrum yellow and has a fair amount of
blue. The so-called blue flame carbons arc designed to be espe-
cially rich in far ultra-violet beyond 3000 Angstrom imits.
This far ultra-violet is practically absent in sunlight and likewise
in the white flame arcs ordinarily used in photographic work.
The near ultra-violet light is very important photographically
with sunlight and skylight, and with the white flame arcs.
The ultra-violet of the white flame is largely in the region longer
than 3500 Angstrom and it efl^riently goes through ordinary
glass.

An important improvement has been the use in photographic
lamps of metal coated flame carbons, especially on the holder
end. The metal coating reduces the holder drop in voltage from
about half a volt to 1/20 of a volt so that a holder designed for
5 ampere use can, with metal coated carbons, be used at 20 or
30 amperes with long, excellent service.

American white flame carbons throughout the United States
have shown 10 to 15 per cent better efficiency of light and longer
life on the average than the foreign carbons. This is because
of superior knowledge and skill that the American carbon manu-
facturers have as regards the making of these flame carbons.
This condition of superiority has been maintained for several
years.

The following ten iwints repeat a few of the advantages of
the flame lamps for photographic artists; the greatest efficiency;
best color duplicating daylight; instant response when current is
turned on; less unsteadiness from fluctuating line voltage; wear-
ing part of smallest cost per unit; most rugged to all kinds of
mechanical and electrical abuse and to adverse weather condi-
tions; lowest cost of installation and operation; can be used for
spot lighting or with screen for difTuse lighting or with reflector
for indirect lighting; largest candlepower per single unit and
maximum portability in proportion to candlepower.

In considering the lighting of moving picture studios, we will

338

MOTION PICTURE PHOTOGRAPHV

the light is reflected so obliquely that a large amount is carried
to the camera from side surfaces, and this arrangement gives
the much desired line and Rembrandt effects, or as better known
to the moving picture artist as molding and modeling effects.
The working area of such a stage is therefore bounded by the
long wall and short wall and the camera line, outside of which
the lights must be. The distance outside should be sufficient
to avoid harsh changes due to inverse square law.

The use of real scenery in place of painted scenery gives, of
course, the best results. Real scenery should be lighted from
the side. Painted scenery should be lighted directly from the
front with the light striking nearly perpendicular. If the scene
is set up with painted scenery, two sets of lighting should be
used, one for the foreground and the other for the painted
scenery. This same principle applies to panorama where near
objects are lighted in one way and the panorama in a different
way to give suitable blending of the illusion.

In lighting it is well to get a suitable blending of the direct
light and of the diffuse Hght. Nature's rule is half and half.
The diffuse light is so advantageous in cutting out the harsh,
sliarp black shadows and giving what is known technically as
luminous shadow effects. Diffuse light can be secured by in-
direct light as well as by diffusing screens. The intensity of the
light should photographically be very high in order to get the
camera to operate satisfactorily with f 5.6. The flame arc can
be used with a camera lens at f 5.6 to give good lighting on a
small stage with 20 kw. The jump from f 5.6 to f 4.5 or even
f 3.5 makes a big difference in the definition and clearness of
the picture. The depth of focus can be maintained better, of
course, with f 5.6, and because of the important artistic value
of the background and the large distances with rapid movements
that should be covered, it is highly desirable to work with a
good depth of focus. With the flame arc the high concentration
of light can be easily controlled as well as the direction of light.
This convenience of control of the amount and direction of light
are necessarily of the highest importance for free artistic expres-
sion on the part of the directing geniuses. In general, the moving
picture stages will use with flame arcs the following amount of
powers having the lens at f 5.6,

240

INTERIOR LIGHTING

Small stage 20 kw. 4 to 6 Aanic lamps

Medium stage 50 kw. 10 to 16 flame lamps

Large stage 100 kw. 20 to 32 flame lamps

Using the larger openings of lens f 3.5 as low as 20 kw. with
flame arcs can be used to secure the illumination of large stages.
As the amount of light varies with the reflecting surfaces and is
inversely as tlie square of the distance from the light sources it
is not easy to give exact information without going into too
elaborate detail. Also multiple reflection can in partly closed
spaces greatly increase the illumination.

The artistry of the moving picture field is advancing so rapidly
with so many new and complex changes that it is rather hard
to keep track of even their main drift. Among the recent in-
novations has been the production of plays with the background
subdued so that instead of the usual "close-up" the faces of the
players in tense scenes are accented throughout the entire pro-
duction of the play, as, for example, in the play "The Golden
Change." In this case, the background is subdued to such an
extent that the characters in the foreground appear to stand out
in stereoscopic relief.

In another arrangement an intensely lighted background is
used to cause the players to stand out in sharp shadow-like re-
lief. In still other cases the immense control of intensity of
light gives a power of securing the sudden appearance or disap-
pearance of an aclor in trick and dramatic pictures and to aid
greatly in securing such peculiar effects as double exposure and
other photographic tricks. The lighting can be utilized in such
a way tliat the artistic forming of the picture is accented in har-
mony with the idea involved. Another way in which flame arcs
are used is for casting shadows in trick pictures and to represent
prison scenes in the more artistic manner of showing the shadows
of the prison bars rather than the actual grim stolid fact.

It would not be expedient to describe in elaborate detail the
many devices for rapidly moving the lights around in studios or
the particular mechanical arrangement for carrying the lamps
around on wheel cabinets or on trolleys or on ropes, etc. The
actual installations of ligliting are arranged in a great variety
of ways. In some cases the overhead lighting is set up with the

341

M O T I

CTURE PHOTOGRAPHY

idea o£ permanently supplying the particular set. In other cases
the overhead lighting is arranged so as to be easily moved by a
trolley system from set to set. In the latter case the small
weight oi the flame lamps in proportion to their candlepower
greatly reduces the cost of moving system and also aflFords a better
utilization of admitting overhead daylight if this is desired.

For side lighting the flame lamps are mounted on wheel stands
cither separately or in powerful unit groups of 6 and 12. Such

-£L

lUf «ajT T«t«r

. Ct » M «»1t mM*

UfhllM mlU.

*■ larg* elrtfa l« u* «rtt«ir tAKMflta • Htal ««• (aft*-

Ut MO U * U iBtt »»«» Ova,

Fig. 69

Ovtrbead II|bliof it Madison Square Garden for drbl cwacfw

aimulianeausly.

lamps arc arranged to be easily moved. It is interesting to note
that the resistance of the flame lamp can be mounted in a sep-
arate room so as lo further reduce the heating which is remark-
ably small with the flame lamp. In some studios a dozen Aristo
lamps are mounted in a portable cabinet formed in sets of three
rows of four each with the top row forward and the bottom row
back away from the stage. The whole can be easily moved
around the studio because mounted on wheels.

We give a diagram {Fig. 52) of the overhead arrangement of
flame arcs and mercury arcs used for lighting a boxing match
at Madison Square Garden. It is interesting to note that eight
moving picture cameras were used simultaneously and the entire
room was so well lighted that brilliant illumination was obtained

in every part of the large ball.

a«t

INTERIOR LlGHTIxVG

The use of flame arcs is carried out on an extensive scale in
the Vitagraph moving picture studio located in Brooklyn, New
York. Mr. Ross, master mechanic of that studio was kind
enough to furnish data showing that the average number of flame
lamps (20 amperes each lamp) used per set is twenty. In the
Brooklyn studio alone, there are 225 flame arc lamps, hanging
overhead, or in sets, in stands, or mounted so as to be easily
moved about in small carriages in order to eliminate shadows.

i^tsisLSiL

£Ma

S;^

Fit. &S
Interior rocwa with aid* mad top diSuac UKhlUtc witU Flame Area.

Figures 53, 54, 5^, illustrate liow some interior studios tise
multiple reflection to greatly increase eflTiciency and give difTused
light

Mr. Cecil B. DeMille, director of the Jesse L. Lasky Feature
Play Company, wrote an article under the title "Lighting to a
Photoplay is Like Music to Drama." He concludes that lighting
effects as applied to motion pictures assume precisely the same
value in the photo drama that music assumes in the spoken drama.
He says "the theme of a picture should be carried in its photog-
raphy," "The Cheat/' representing unprincipled sinister Jap-

MOTION

PICTURE

PHOTOGRAPH Y

anese characters, used abrupt bold light effects to definitely sug-
gest the "clang'* and smash of Japanese music.

In "Carmen." however, the Kembrandt idea was followed.
The lighting and grouping of the characters in the soft shadows
were all worked out in keeping with the school of thai famous
master.

"Litrht cfTects arc out of place In comedy : there yon wil! notice

Fig. S4
loteriar room witli cntirdr indirect lighl with Plime Aru.

our lighting is clear and brilliant corresponding to the faster
light comedy and music, except in the melodramatic scenes where
we carry our audience into thrills, not only by the action of
the artist, but by a change in the mode of our photography."

Many new flame lamps have been invented and developed in the
last year or two, and now varieties of flame carbons for special
effects are available for a multitude of simple or complex artistic
effects. However, only a small beginning has been made as to
the artistic effects counting merely the minor factors of control
such as direction of light, its diffusion, change of intensity and
the power by proper color and environment to greatly aid the
moving picture actor-artist.

244

INTERIOR LIGHTING

There is the subject of "catch-lights" in the eyes of the play-
ers that represent the reflection of the light sources. If the light
sources are rectangular in sliape, then the catch-lights will be
rectangular or triangular and with sharp curve points. The bad
eflfect of not using round or oval light sources is easily ap-
preciated. It is well recognized that curved lines convex to each
other tend to give a sorrowful, depressed look. Curved lines

Jd^

Tiatiti.

A^XLiXL

Fie. &6

Interior room fcr hinb efFiciracy liKhtttig hy multifile refl«ctioB.

concave to each other, tend to give a pleasant, agreeable, smiling
look. By attention to the shape of the diflfusing screen for the
light sources, it would seem possible to vary this element so as
to be in harmony with the ideals of the p'ay. All the recent
moving picture photo-plays of the best companies show the power
of white flame arc lighting to give fine definition, splendid half-
tones, luminous shadows and favorably shaped "catch" Ughts.

In some studios the light of the flame arc is thrown ui>on the
ceiling or a reflecting screen, and in this way some very beautiful
pictures have been photographed. The possibilities of indirect
lighting with the flame arc have been touched upon. By suit-
able lan^p design, it seems practical not only to get more diffuse

Stf

light but also greater candlepower delivered to the working plane.
Again in the matter of re^ilation, the shunt control is one of
the important future developments that will enable the artists
to secure a wide variety of new effects.

On alternating current efficiency can be greatly increased with
the flame arc by re-actancy control.

In the matter of studio lighting, interior rooms lighted entirely
by artificial light have splendid advantages, because the lighting
can then be entirely controlled by the artist, and the extremely
hot atmosphere of sunlight glass studio is done away with and a
cool, comfortable studio can be maintained throughout the year.
The director can then obtain all diffuse liglit, all direct light, or
any proportion and direction of diffused and direct light under
perfect control, and old King Sol with his changing position, will
be entirely imneccssary for all interior scenes.

Z46

Chapter XV

EDUCATIONAL AND INDUSTRIAL
PICTURE MAKING

THE making of so-called educational pictures has developed
until it now calls for a high degree of specialization. In-
dustrial pictures are of the same type in the majority of
instances, and may be classed under the same heading; as the
higher grade of scenic pictures.

It is no longer possible for a cameraman to take his camera
out in an automobile and. after riding around for a day, return
with a heterogenous collection of scenes and dispose of it as
"Picturesque Podunk," length 989 feet.

If he is not familiar with the region he is about to record, he
goes to the nearest library or book store and peruses with care
and diligence all possLihle literature describing the locality. He
writes the history and location of landmarks and points of in-
terest in his note-book. He records incidents of the customs and
habits of the natives, with a view of finding characteristic bits
to enliven the skeleton scenario which he will make before he
starts to turn the crank on his picture. When he has done this,
he engages a car and a chauffeur well acquainted with the locality,
or pack mule, or whatever conveyance the case may demand, and
a guide.

He then starts out with his outfit to find the things which he
has noted in the synopsis. His eyes arc open for anything that
will add interest to the picture. Many things will greet his eye
that he had not foreseen. But the chances are, if his scenario is
what it should be. whatever he discovers will help round out and
add interest or local color to what he has already planned.
Oftentimes he discovers something that will give him material
for another picture aside from the one he has planned.

I remember, making a picture of an historic Mexican city years
ago. It nestles in a beautiful valley between high mountains of
impressive grandeur, and my first thought was only of the beau-
tiful scenic picture tliat I could make in the quaint old city, with
its historic buildings and rugged mountain scenery. It was a
perfect mine of interest.

MOTION

PICTURE PHOTOGRAPHY

When I had finished I had material for the following pictures,
varying in length from 400 to i,cxx> feet : "Picturesque Monterey,"
"Hemp Industry," "Rope Making," "Thermal Baths of Topo
Chico," "Where Nature Makes Soda Waters." "Iron Industry
in Mexico," "Zinc Mining and Refining," "Primitive Laundries/'
"Beer Brewing," "Mexican Cookery," "Bull Fighting in Mexico,"
"Pulque and Mescal — Tlic Mexican National Drinks," "Beasts of
Burden in Old Mexico," and some others which I do not recall.

On the first trip many of the scenes mapped out can be found
and taken. Others will either be impractical, or lacking in in-
terest, or be in such relation to the light as to require taking at
a diflFerent time of day.

A compass and timepiece are indispensable, although in the
absence of a compas."; the watch may serve for both. Point the
hour hand of the watch in the direction of the sun and half way
between the hour hand and the numeral twelve will be south.
Knowing this and reversing the process will show you at just
what hour the sun will be at the most advantageous position for
taking your picture.

Make a note of each subject which you intend to take at a
particular time and arrange the schedule with your guide so as
to return and cover the missing scenes with the greatest effi-
ciency.

Learn to use just enough film to show your subject plainly
and well, but stop before the interest can lag. A naturalist
friend of mine took a camera on one of his expeditions.. On the
first trip he took a whole roll and sometimes two or three rolls
of film on each subject, unless it flew away while he was reload-
ing, Of the details of camp life, of the ex-prcsidcnt who was
a member of the expedition for a portion of the time, of the
methods of preserving specimens and a thousand other interesting
details he took not one inch. They were cvery-day matters to
him, and it never occurred to him that the people who would view
the picture would be interested in anything other but what in-
terested him.

Try to look at things with the eye of a curious stranger.
Don*t let the little interesting things that may be familiar to
you get by. Often they are the spice which seasons the picture.
A cute kid with a dirty face engaged in some childish occupation,
or a baby animal of almost any kind, are more apt to touch the

EDUCATIONAL AND INDUSTRIAL PICTURE MAKING

emotions of an audience than a beautiful landscape. The in-
nocent flirtation of a buxom peasant girl, or the foolish amorous
smile of a hulking farmer boy, even a close-up of a beautiful
wayside flower adorned with a honey bee, or brilliant butterfly
will bring your sixrctators into more human relationship with
a scenic picture.

There are millions of people In this broad land of ours who
have never had the opportunity to travel. An old style scenic
with panoramas of ancient ruins or old castles brings to them
no more sense of reality than engravings of a fairy story in a
book. Show among these ruins or castles, things which are
kindred to the emotions which they experience and you establish
a sympathetic bond which gives them a sensation of reality and
relationship to the images on the screen.

While dwelling on the intimate touches that go to make in-
terest in a picture we must not lose sight of another factor.
That is the sense of the beautiful. "Artistic composition" sounds
highbrow, but the lowliest of us have some innate sense of the
artistic. The soddcnest wretch who ever passed a nickel into a
picture house ticket-window may be capable of catching his
breath at the glory of a mountain sunset thrown on the screen
though his intellect would prevent his putting into words the
emotion that the picture caused.

The cameraman who makes interesting educational pictures is
more than a photographer. He is an artist, an author, a director
and a scholar.

As an artist he strives to make his pictures pleasing to the
eye. He is not content with his natural gifts in that direction if
he is ambitious. He studies books on art and composition when
he has the opportunity (and tn this day of free libraries and cheap
printing there are none who have not the opportunity.)

As a scholar and author he studies the subjects which he makes,
and complies a coherent and consecutive story before he starts
his picture. In his brain must dwell a clear conception before he
can crystallize it for others.

As a director he has charge of his subject matter, and, whether
his actors be moths or machines, cascades or cocoons, he is as
surely the director as the man who moves the living pawns and
knights on the chess-board of melodrama.

As a photographer and cameraman he is master of the camera's

SiS

MOTION

PICTURE PHOTOGRAPHY

As 1 have said before Percy Haughton, the Harvard Football
coach, is making use of the nxttion pictures to find out what his
teams are really doing. The motion camera is now a part of ihe
athletic equipment at Cambridge, and it is expected that many
hitherto inexplicable weaknesses may be found and corrected by
a study of the film. The presence of the camera acts also as a
stimulus to the men on the field, they feel that they are on dress
parade; it may be possible to avoid the eye of the coach, but the
lens is relentlessly sure.

Mr. Haughton took still photographs of plays that seemed
perfect but which failed in execution. The difficulty that con-
fronted him was human. Altliough the camera was fast enough
no photographer could possibly tell the exact second at which to
press the bulb. Had he known the second, it was impossible to
co-ordinate eye and hand. Tfie motion picture camera offered
Uic solution. With a film the whole play niiglit be taken and then
the defect discovered by a study of the various pictures.

It was found that certain inen shifted their poise just as the
ball was being snapped, and thus lost their chance to start ; that
others relaxed their tension for just the fraction of a second
before the play was on and thus were late. Individual peculiari-
ties of the hands — a thousand and one little things that even the
keenest eye could not find appeared on the screen when the n^a-
tivcs were studied one by one.

All our theories of activities are likely to be revamped as a
result of the film studies. The eye cannot be trusted to tell
what it sees, for it is easily confused by rapid motion. The lead-
ing trainers all believe that considerable progress in every branch
of athletic activity will come about as a result of the opportunity
to make a laboratory study of the human body in motion.

When it is realized that one-tenth of a second means about
one yard in a hundred-yard dash, the importance of little things
will be realized. The single faulty motion of the hurdler taking
the bars makes all the difference between the fast man and the
slow one. There have been men that could not really run fast
in a flat race who were very speedy over the hurdles simply be-
cause they wasted no motion or effort in leaping across the
obstruction.

It is in track sports that the greatest good is expected from
the film — track performances are a matter of little things done

ass

EDUCATIONAL AND INDUSTRIAL PICTURE MAKING

perfectly. The day of great changes has passed; in the last
fifteen years the style of athletes has been about universal. There
seems little likelihood of revolutionary changes, such as the
"crouching" start in the sprints or the substitution of the stride
for the jump over the hurdles or the approach in the high jump.
In many events the limit of human endeavor is near at hand, and
the lowering of records will depend upon the conservation of
eflfort toward the end desired. Nearly every big event is now
taken with the motion camera and is eagerly studied by coach
and athlete to learn if the winner had any new or improved way.

Authorities on the subject claim tliat baseball has been placed
on a highly scientific basis by exhaustive investigations conducted
OQ the same principles as the most efficient methods. It now
seems probable that there are still greater possibilities for im*
provement under the keen eye of the camera.

Most of the education film companies have their own camera-
men who attempt to cover as far as possible the more important
educational features of this country. These traveling cameramen
include in their itineraries the most interesting views of prin-
cipal cities and the most beautiful views of natural scenery. It
is impossible for the regular cameramen to obtain many important
subjects so any motion picture camera operator will find a ready
market for high class films.

For example, one of the largest and best-known educational
film companies recently started a cameraman on a trip across the
continent with instructions to take certain views in New York
City before proceeding. He was told to obtain a view of the
Statue of Liberty in New York Harbor with the sim setting
behind the statue. Were it not for this particular fact the
cameraman might have started on his way westward sooner but.
owing to inclement weather and to the hazy atmosphere prevalent
in the harbor, he had to wait nearly two weeks for the required
picture.

How much better it would have been for the company to have
sent their cameraman on and to have advised some local photog-
rapher just what was required. The local man could have been
on hand daily at little expense.

There arc in every fair sized city, some points of interest that
make good educational subjects.

A man living in the small town of Burlington, New Jersey, was

'MOTION PICTURE

PHOTOGRAP

quite surprised to learn that an educational film company had
sent a cameraman to that town to obtain some views of shad-
fishing in the Delaware River. Shad-fishing in this particular
spot had been going on for years and years but the local man
had not appreciated the fact thai this familiar industry would
make a worth-while picture.

There is the same market for first-class educational pictures
as there is for "Newsfilm." Educational work is best for the
local photofrrapher because there is no hurry, no mad rush be-
cause of the news-value of the picture. Often "Newsfilm"
cameramen become excited and neglect to make some final ad-
justment of the camera which results in a spoiled picture. On
the other hand, the man photographing educational pictures may
take his time and get the best results obtainable.

Industries of special nature, such as the automobile industry,
make good subjects. Heautiful scenery which you may see every
day but which people may come miles to view, is well worth
photographing. In fact any subject that is of general interest
makes good material for educational pictures.

Of course, the more technical part of educational work, such
as the microscopic studies of plants and small organisms cannot
be attempted by everyone but some little feature might occur
that would make interesting material for a picture that others
would enjoy seeing.

A former professor of physics has taken up moving picture
work lately. He found that photographs of some of his experi-
ments in chemistry and physics were interesting and found a
ready market. Now he is engaged in making a picture of the
life and habits of the ordinary frog. You see there's always a
field for those who are alive to the opportunity.

When the motion picture photographer goes from the tem-
perate zone to the tropics lie will find himself confronted by new
problems, which result from tlie unhealthy climate^ the uncertain
light values, and the intense heat.

A cinematographer made a trip to the Canal Zone during the
rainy season. When he removed the film from the packing cans
it was soft and an hour after placing it in the box of the camera
it was as wet as could be. The following morning it was com-
pletely covered with mildew. Moisture not only deteriorates the
speed of film but, if the film is not developed immediately, de-
stroys the latent image.

S64

EDUCATIONAL AND INDUSTRIAL PICTURE UAKING

How may this be avoided? One cinematographer, working in
the heart of Africa deemed it advisable to carry the film stock in
a cooling case similar to a vaciuim. flask. He guarded against the
exterior becoming hot by covering it with cool banana leaves.
The film chest was made like a metal refrigerator of double walls
of sheet zinc with layers of heat-insulating felt packed between
the walls.

You who will travel in warm climates take my advice. Do not
burden yourself with more film than you actually need as it de-
teriorates rapidly. If you can arrange to have small consign-
ments despatched as required so much the better.

Before setting out, store the tilm in air-tight cans and place
adhesive plaster around the edges of the lids. Once at your des-
tination, select a dry and cool place for the film boxes. They will
keep in good condition if placed in an ash-can or other air-tight
receptacle in which a disla of fused calcium chloride has been
placed. Calcium chloride has a strong affinity for moisture and
takes it up rapidly. It absorbs it so rapidly that it will soon
dissolve in the moisture it takes up, making a corrosive liquid
disastrous to metal. Therefore, it should be surrounded by some
absorbent material to prevent its spreading.

Re-load the camera only just before you plan to "shoot."

If you do not protect the camera from the direct sun as much
as possible, you may experience considerable difficulty in turning
the crank. The sun is apt to heat the brass and make it too hot
to be oi>erated with the bare liands.

Develop the film at the soonest possible moment.

A cameraman working in the Sudan discovered that sunrise is
the ideal time for developing in the tropics. Then the air is not
too warm and the water, kept in canvas buckets since the heat
of the previous day, is cool.

This operator used an oblong straw hut, 17 feet by ll feet, as
a dark room. The inner lining to keep out the light was a red
and black Turkey cloth, slightly smaller in size. No ventilation
was provided. There were openings both at the top and the
end to accommodate the wooden frames. In the openings were
placed ruby glass, ground-glass, and thin wire netting. He made
his own developing frame of native timber, shaped it like a 3-foot
6-inch dmm and painted it with paraffin. He made two troughs,
one for the developer and the other for hypo, ot wood joining the

Af O T I O N

PICTURE PHOTOGRAPHY

sections together with pitch. He allowed for a space of an inch
between the film and the trough interior. Each trough had two
wings, so that the developer and hypo would be caught on falling
from the film and be conveyed back into the trough-well. To
hold the axle carrying the drum he equipped both of the troughs
with slotted side arms.

The developing materials used were Burroughs, Wellcome &
Co. "tabloid" pyro soda and a little bromide of potassium. He
used eight cartons to develop two hundred feet of film, and dis-
solved them in a bucket half filled with water.

Often water is difficult to get and of poor quality. I have
used river water that looked like coffee by stirring an ounce of
alum in a barrel of it and allowing it to settle over night. I
used the cfear water at the top by decanting it off with a short
length of hose. Many times the residual sludge in the bottom
was four inches deep. At a pinch, sea water may be used for
washing if a final rinse of about five minutes be given in fresh
water.

For the worker on a small scale, pin racks and trays that nest
compactly are probably best on account of case of transportation.

One man showed mc a neat outfit he had made. It consisted
of skeleton drums which could be dissembled for packing, with
nesting nickel-lined metal troughs. The entire outfit of a dozen
loo-foot drums, three troughs and a lot of black felt, used for
extemporizing dark rooms from hotel rooms and native huts,
packed into a fair-sized trunk!

He dried his films on the same drum on which they were de-
veloped, a thing which is difficult to do satisfactorily on pin
frames.

266

Chapter XVI
ANIMATED CARTOONS

IT is now several years since Winsor McKay, the famous car-
toonist and creator of innumerable and pc^HiIar comic char-
acters, totik the trouble lo make sixteen thousand drawings,
proving that with the system of reproduction used in cinematog-
raphy to create the action in the images he could, for the first
time in history, produce on the screen the miracle of an animated
drawing.

Animated drawings became immediately popular in Europe
although not on the same scale or with the same effect as in this
country. Profiting by the example set by McKay, others applied
themselves to the same work and soon produced films with ani-
mated drawings, cartoons, caricatures and other products of
the pen and brush which became so popular with people that
they have come to form an indispensable part of cinema ex-
hibitions.

AVithout a doubt, sixteen thousand drawings is a great number
and not every one has the patience of McKay nor the skill and
time to devote months and months to the production of one
picture. As a result of this, the art has degenerated a bit, with-
out losing any of its attraction, and sti'I the inimitable creations
of McKay and of Bray, who followed faithfully in his footsteps,
have few imitators in point of technique, although animated
cartoons continue to excite delight and applause.

The average person has little conception of the mechanics of
animated cartooning. One need not wonder at this for many
young artists arc likewise ignorant. Those artists who are doing
this work have perfected schemes of their own, after weeks and
months of practice and experimenting. The successful ones
jealously guard their system. The rcascms arc obvious.

As a rule, trick photography is combined with an intricate study
of motion and its portrayal. Some artists rely almost entirely
upon successive drawings and others upon cut-out figures — an
elaborate and delicate process. Occasionally one will find an

2S7

MOTION PICTURE PHOTOGRAPHY

artist who makes as many as 5,000 drawings for each 500 feet
of film. On the other hand, an ingenious artist might obtain
smooth animation with but 500 drawings for the same length
of 6hn.

Consider the task presented when animal cartoons are drawn
and the artist has to make four legs move in a fairly natural way
and at uniform speed in bringing a dog or cat into a picture. If
too many drawings are made, his pictTire drags; if too few,
tiie motion is jerky and stiff. To strike the riglit combination
is an art.

There is one difficulty which, while perfectly evident, is rardy
appreciated. "Minute exactness is profoundly necessar>' in ani-
mated work," to quote Vincent Colby, creator of animated Colby
Dogs, "for the excellent reason that the drawings are enlarged
enormously when projected on the screen. This brings out
in a glaring manner the most infinitesimal inaccuracies present
in the original sketches. Thus the cartoonist's finished work for
the movies contrasts with that of the newspaper caricaturist in
that in one case the cartoon is enlarged and in the other, reduced
for presentation."

In order to animate a cartoon, it must be drawn on some trans-
parent medium whether it be paper, celluloid or ground glass.
In the center of an ordinary bread board cut a rectangle g" x 12".
Fit a piece of window glass into this opening. Two steel pegs,
four and one-half inches apart set into a bar five and one-half
inches in length are fastened to the board at the upper side of rect-
angle and immediately at the edge of the opening. The bar must
set in a chisscled-out space so that the surface of the bar is flush
with the surface of the glass and board. The glass is held in
place flush to the board by nailing thin strips of wood to the
edges of the rectangle beneath. It is held fast by placing strips
of adhesive tape around the edges of the glass.

The board is placed at a slight angle to the drawing table
and an electric light is put under the glass. The paper used is
substantial ledger paper free from water marks. The paper is
held in place by punching holes at the top, four and one-half
inches apart, which fit over the pegs in the peg-bar. Thin cel-
luloid, a clear and transparent grade, about .005" in thickness
is used over every drawing which goes under the camera.

Celluloid is one of the most important time-saving devices in

3fi0

ANIMATED CARTOONS

animating a cartoon. All drawings not representing motion may
be put on celluloid. To be more explicit. Let us imagine a
kitchen with a table in tiie middle of the room, on the table a
jar of jam. A boy walks into the room, spies the jar. walks near
the tabic, rubs his stomach in anticipation, takes the jar of jam
and walks out of the room through the same door througli
which he entered. Those parts of the picture which remain
stationary' may be drawn on the celluloid. Make it a point to
take care of as many things on the celluloid as possible. This
leaves less to take care of on the paper drawings. In carrying
out the action planned above, one would place a paper on the
pins and, after drawing those lines which do not move through-
out the action, on the celluloid, would place the celluloid face
doMm on the model. Since the jar of jam is stationary for the
first part of this example, the jar could be drawn on the back
of the celluloid and left until that part of the action when the
boy takes it up. Then it could be erased with ammonia.

Before attempting to animate a cartoon, an arhst should ob-
serve all natural movements of man, animal, lish, automobile,
train, or whatever it is he wishes to animate. He must likewise
study the consecutive minor movements which go to make up
any major movement : the positions of the feet in running or
walking; of the hands in clapping, etc

The field is the space inside of which all action must operate
freely. The field lines should be ruled on the glass, f x gj^*
is a good size for the field. All action entering the field should
be started from behind the field lines.

In order to keep an exact likeness of a character throughout a
picture it is best to make a complete set of head positions of that
character. In this way, the head may be traced from the model by
placing it under the paper in the position desired. This not only
keeps the likeness the same but holds the proportion which is diffi-
cult to obtain free handed. The ordinary set of head models is
drawn in a row on a slip of narrow paper. They arc composed
of five positions. One profile, one three-quarter front view, one
three-quarter rear view, one full face and one full rear view
make up the set. If any other position is called for, it too can
be placed on th%: slip of paper and used as many times as
required.

28!

ANIMATED CARTOONS

CUT-OUTS

A cut-out is any object whicli is cut out of paper or celluloid
and laid over the paper drawings or the celluloid overlay. Sup-
pose a man's hat blows off his head and out of the picture. A
drawing of tlie hat niay be made ol celluloid. The artist then
cuts out tlie hat and instead of making separate drawings, moves
the cut-out under the camera until it carries out the effect of
being blown out of the field. Talk baloons are also cut-otits
and are laid over the celluloid while the characters make mouth
movements. ALX. cut-outs must have the edges blacked or
they will cast a shadow.

Ordinarily tJic action on each drawing should advance about
one-quarter of an inch biit sometimes more or less. In short
action, where the space is limited, make a division for the moves
and space the action each time, the distance of one of these
divisions. In operating between two fixed points always make
the divisions cqui-distant for the moves. Fast action should
never be spaced over three-quarters of an inch. Wider sjucing
makes the movement jumpy. The spacing of drawings does not
govern their speed on the filiu. The number of exposures given
each drawing regulates the action. The fewer the exposures
the faster the action.

Avoid having more than one character or object in moHon at
the same time as the eye can follow but one movement easily.
Characters should be brought into some natural and appropriate
position before being kept idle for a long period. Such posi-
tions as thinking, sleeping or resting are frequently used. Any
object or character whose part of the plot has been spent should
be eliminated from the scene as quickly as possible.

When photographing take the top drawing by the lower right
hand corner and lift and lower it rapidly so that one drawing
can be seen then the other. As a result, the movement made by
the two drawings can be seen. Do this frequently when penciling
out the action and you will find it a great aid in obtaining perfect
animation.

All tracing should be carefully done, line for line and dot for
dot. Any carelessness will quickly be revealed in the enlarge-
ment on the screen. Models for tracing come from the figure
or parts remaining idle and each tracing is made from the same

ANIMATED CARTOONS

model until the figure takes another position which will serve
as a new model. Traced lines should not wiggle in the slightest
degree. Vou can test the accuratcness of your line by (lipping
the paper. If the pen should move the least bit in following a
line, scratch out the wrong line lightly with an ink eraser and
correct it.

The parts to be traced on each drawing should be noted by
a number in the spot where the tracing is to be made. The num-
ber used for the tracing note is the number used on the modcL
Jot notes describing incidents in the action outside the field lines
on a drawing. This note making is especially valuable when
making drawings which reverse or repeat actions.

One sketch-saving trick consists of making a drawing of a
setting and having a large number of half-tone prints made of
it. On these reproductions the motion is sketched Jn, thus sav-
ing an almost endless amount of work.

To Photogr.\ph Animated Cartoons

The camera is set at a distance above the drawings so as to
exactly cover the field of the drawings. A glass frame is fastened
to a board and a peg-bar is set in this frame with pins to fit the
holes in the paper. Each drawing and all celluloids for that
particular scene are placed on the pins in order. The glass
frame works on hinges and is lowered over each drawing and
its celluloids holding lh(;m firm and flat. Arrange two nitrogen
bulbs with reflectors so as to illuminate the drawings evenly.
When one drawing has been photographed, the next one is put
in place.

As I have said, the fewer the exposures the faster the action.
Ordinary action is given three exposures. Fast action is given
two exjwsures and rapid action is given but one exposure per
drawing. As exposures govern speed, it is advisable to organize
a system for walking, running, jumping, etc., and fix an exposure
scale to operate action. There is no rule for exposures, they
must be regulated according to the artist's judgment.

Each paper drawing must be numbered and each scene desig-
nated. Also prepare an "exposure sheet" on which the exposure
of each scene must be indicated.

There is a great demand for animated cartoons. It is per-

Chapter XVII
TRICK-WORK AND DOUBLE EXPOSURE

UNDER this heading will be handled llie numerous so called
"fake" methods used to deceive the eye into believing it
sees something which really never occurred, and, also some
of the methods used to embellish or aid in the artistic conception
of the picture.

The director will often require that the picture grow darker
and darker gradually until it has "faded" to blackness. This is
caJled a "fade-out." It is supposed to indicate the end of an
incident similar to the end of a chapter in a book. To accomplish
this the cameraman must slowly close the diaphragm on his lens
or the shutter opening on his camera. Either will produce the
same result. Some cameras have an automatic closing and open-
ing shutter that performs its complete movement from open to
shut in 10 turns (five seconds or five feet) and vice-versa. These
automatics work by merely pressing a button and holding it
down until the indicator shows shutter to be closed. If the
button is still held down the shutter will begin to open again as the
pressure must be removed as soon as indicator shows "shut" and
a few more turns given to the crank handle to insure that all of
the fade has been wound up into the take-up magazine.

The "fade-in" is exactly the reverse of the above. The operator
starts with the shutter or diaphragm on lens closed. He gives
first a few turns of crank to insure bringing fresh film stock into
his camera and then gradually opens either lens diaphragm or
shutter until fully open or until open to the desired point. All
this time, of course, the other hand is keeping the crank going
steadily and accurately two turns to the second. It will require
a little practice to do these two things at the same time. For this
reason an automatic shutter is very desirable as it does not take
the operators mind from his turning.

Some lenses do not diaphragm completely shut Any lens can
be made to close entirely by having an optical worker fit an extra
leaf in the diaphragm which has a little projection on its end.
This small projection folds over the other leaves when the lens

MOTION PICTURE PHOTOGRAPHY

is diaphrapiicd down below f.64 and closes out light completely.
It iU)ca not alTccl Ihc working of the lens at all when it is used at
various oiicnings alihough it may appear to one that the projec-
tion would cast a shadow. It must be remembered, Iwwever,
that every point or node of an anastigmat lens is projecting the
image all over the field from every point or node on the surface
of the lens. The projcciion on the diaphragm only cuts out a
few of these rays and therefore the only eflFect is to make the
lcn» work a very little slower, so little that it need not be taken
into consideration. The small projection is, however, very small
and only of sutTicicnt size to cover the pin-hole opening of f.64.
Do not allow an incompetent optician to fit a large clumsy pro-
jector piece U) a diai)hragm leaf. ,

llausch & Lomb, Rochester, N. Y,; E, B. Meyerowitz, New
York ; C. P. Goerx, American Optical Company. New York ; are
M>nic of the concents which do this kind of work.

There is also a method of honing the blades of a diaphragm
down to a nuor edge so they will close completely but it is a
(lecidedly delicate process. The worst of this is that the blades
do not Ust long after they have been boned but soon cut them-
^selves to pieces.

To nwfce a fade, however, a lens does not neccssarilT have to
cloae entirely. The cameraman can. the moment his diaphragm
has been turned shut as tow as it will go, bcgm to speed op on
tus crank and at same timr place his left hand in front of the
kna. beinc sure to keep cranking a few turns after doing this.
T1« effrct win be perfect. The same can be droc in tading-in.
Start vith a fast crank, at same txoM lemuwiug hand fnm lens
and qpikkly sfev down to aonual crmak speed at sane time be*
ghnif to tore the diaphnon op^A to ^ point yott desire to
work at.

An >wu>c* ^^^ sboaU be ahoot Grc-fcct — tan toras of

A Me at the cad o( Ibe entire pktne. (
WaboMtiea ttet a slow £ade.

Fbdn ol %tes or excitxn( actioa dhavM
vbflB in cr Q«t {aaks^ Tber
iect or six tm^

A «Mhr resnk te late is the

Ib^ is imitlijbiit ^

)

TRICK-WORK AND DOUBLE EXPOSURE

hood of the camera — sometimes called the sun-shade. It must
set at least three inches in front of the lens (2-inch lens). This
diaphragm has a lever projecting to one side and while turning
the crank steadily the cameraman uses his free hand to push this
lever one way or other to either close or open the diaphragm
leaves. This produces on the picture a circular shadow enter-
ing from the edges or corners until it completely circles the pic-
ture out. The effect is very pleasant if carefully done, but a
jerky movement of Ihe lever is worse than if the effect had not
been attempted.

A circle-out should never be less than five feet in length. This
means ten turns of the crank during which the diaphragm lever
must be steadily pushed in its proper direction with the other
hand.

The diaphragm may also be used to shade or vignette the cor-
ners of tlic view. The diaphragm can be used for numerous pur-
poses. It may be used to cut out a bothersome bit of sky in one
comer or to cut out an objectionable side of the set. I have u,sed
it frequently to shade out the corners of the film where a lamp
was placed very close, In this manner, I obtained the strong
effect from the lamp that I desired and at the same time avoided
flare in the lens.

Care must be taken that the diaphragm does not sh'p after it Is
set. Some diaphragms have set screws to fasten the lever in
any position.

Keyholes on the screen are produced by means of a metal
mask that is fitted in front of the aperture-plate of the camera,
and, of course, -back of the lens. The keyhole is usually cut in
thin brass by means of a very fine file and the edges then smoothed
by rubbing with a very fine emory cloth followed by rouge-cloth
such as jewelers use, the idea being to obtain a very smooth edge,
otherwise the edge will enlarge on the screen and appear ragged.
There are, in most cameras, two small springs to hold these
"masks" in place when they arc set in front of the aperture plate.
After they are placed, focusing is done through the ground glass
as heretofore. The keyhole will appear as picture and all around
it will be black.

Of course, a variety of different openings can be cut in thin
brass and thereby can be obtained such effects as looking through
either a plain or latticed window, looking out through the entrance

MOTION

PICTURE PHOTOGRAPHY

of a cavern, etc. In ihc cavern effect it is a good idea to leave
the edges rather rougli to give the effect of rough rocks.

To give the effect of binoculars two circles which overlap each
other are cut ^vith a drilL To obtain a smooth overlap it is neces-
sary to first solder the thin piece of brass to a piece of heavier
brass or soft iron. Then drill through the thin piece into the
heavy. After the two holes arc drilled heat the pieces and they
will melt apart and you will have a thin piece or mask with per-
fectly smooth and clean-cut edges.

A telescope is done in the same manner only there is but one
hole. As a matter of fact, when the eyes look through binoculars
they see but one opening if the binoculars arc of any account at
all and properly adjusted, but |K>pular custom has decreed that
binoculars are double circles and they are invariably so repre-
sented on the screen.

Sometimes when showing binoculars the view as seen through
them is out of focus at first and then comes into sharp focus as
the holder of the binoculars is supposed to adjust them. This
is done by first focusing the camera on the view and noting the
mark at which the calibrating dial is pointed. Then deliberately
throw the camera out of focus, and, while turning, brmg the
focusing dial back to the correct mark.

There is no end to the variety of fancy frames and masks that
may be cut for the aperture of camera.s. They range from plain
ovals and circles, to intricate lattice-work effects and geomoCrical
designs.

In over-sea countries the fancy masks are used a good bit more
than in the United States.

Visions on Dark Walls

We now come to the many varieties of visions that appear on
walls, against doors or in dark fireplaces, etc.

The student will now have to learn to count while he is turn-
ing the crank. He must not count every turn but every other
turn. If he tries to count every turn he will find that his breath
will give out when he reaches about one hundred or so. He
must count aloud so that the actors can hear him above the buzz
of the arcs.

Suppose we have a scene that calls for an actor to cross the
stage, seat himself in a chair, remove a letter from his pocket

970

TRICK-WORK AND DOUBLE EXPOSURK

and look at it. He leans back in chair and looks at wall above
fireplace, and, as he does so, there "fades-in" a picture, above the
fireplace, of his brother's face.

We proceed thus: The entire scene of the actor crossing the
screen and sitting down, looking up, etc, is taken first. The
cameraman places his film in the camera gate after carefully
focusing and observes when the two pins that puH the film down
after each exposure are exactly at the bottom of their downward
stroke. He then marks the two holes that these pins engage in
when at the bottom of the down-stroke. This can be done either
by pencil or by cutting a notch opposite the perforation we wish
to mark. The system of marking depends upon the construction
of the camera. On a Pathe it is difficult to mark under the gate
so a scratch mark is made on the side of the camera plate which
will come exactly opposite a perforation in the film when the pins
are at the bottom of the stroke. The idea of this is so that the
film can be rewound and set to exactly the same mark to start
again. U it were to be one or two perforations out of true the
picture would be out of frame when taken the second time and
the vision, instead of appearing above the fireplace as we desire,
would probably be up half way between the pictures which
would never do.

Having assured himself that he has marked the film so that
he can return it to exactly the same place, the cameraman takes
three turns of his crank to make sure he has fresh stock in camera
and stops with his crank handle down — straight down. He is
now ready to start. It is now important that actor and camera-
man start at the same moment so the cameraman starts his handle
and after two revolutions says loudly, "one" after two more turns
he says "two" and so on. The actor goes through the scene in this
case regardless of the counting up to a certain number which has
heretofore been agreed upon at which point he is supposed to be
looking at the vision. Wc will assume that at 20 he is to sec the
vision of his brother. When the cameraman's count comes to
twenty the actor looks up at the spot on wall where the vision is
to appear as previously agreed. He looks until the cameraman
comes to — we will say 30 — when the actor removes his ^aze.

The cameraman counts up to the end of scene or when the
director says "cut" or "through." He (the cameraman) now
reverses the belt on his take-up magazine so the film will wind

MOTION PICTURE PHOTOGRAPHY

backwards. He must be SURE TO CLOSE THE LENS, no
light must reach the film on its wind back through the camera.

Having closed everything tight against light and reversed belt
the cameraman begins turning his crank backwards counting at
the same time until he has T:o«ntcd backwards as far as he had
previously gone forwards. He now takes the additional three
turns that he took at first and opens camera. The film should
now be at the exact point at which the scene started. Now» be-
fore doing anything else he OPENS THE LENS and RE-
VERSES BELT ON TAKE-UP AGAIN as it must be for
turning forwards.

He can now remove the film from gate and focus for the vision.

This vision need not be taken at the same place at all. It is
preferable to have the brother seated before a black cloth with
plenty of light on his face from both sides and not much deep
shadow except on the black cloth, of course.

In order that the vision will be at its proper place on the
screen before leaving the set-up in which he took the film just
exposed, he made a mark on the ground glass of ttie space oc-
cupied on the ground glass by the space over the fireplace w^here
the vision is to appear. (If the ground glass is too smooth on
the glass side to lake the mark of a fountain-pen use a piece of
ground celluloid instead, in this case — turning it towards the rear
of the camera, but use it for getting jxisition only as, being
reversed in the camera it would not give the proper focus if used
for focusing by. Focusing of the vision must be done on the
regular ground glass — that is — the bringing of it into sharpness
and clearness.)

The person who appears in the vision, having been placed be-
fore the black cloth ancJ camera set so he occupies the correct
position, the cameraman proceeds to mask out or cover all parts
of the scene except the vision itself. This can be done by means
of the outside diaphragm already explained if it is mounted on a
sliding base by means of which it can be brought to any position
desired in front of the lens, or it may be accomplished by means
of pieces of electrician's friction tape being stuck across the front
of the light-hood or sunshade of the camera. These masks or
whatever is used must be about three inches in front of a 2-inch
lens.

Everything but the vision being covered the fihn is now re-set

872

J C K - W O R K AND DOUBLE EXPOSURE

in the gate so thai the pins will engage the same perforations at
the bottom of the stroke as heretofore explained, the camera
closed and three turns of the crank taken as heretofore ending
with the handle down as before. The lens diaphragm is closed
and the operator holds his hand over it if it does not entirely
close or else llie dissolving shutter is closed. The operator now
begins turning, counting as before but the LEXS REMAIN'S
CLOSED up to the number where the vision is supposed to
appear. In this case the vision is to appear at 20. So at ao
the operator removes his hand from front of lens and "fadcs-in"
for five feet counting all the while. Or if he is using an auto-
matic shutter he presses the button at ao and holds it to 35.
He now keeps on turning, the vision being meanwhile photo-
graphed and at 30 in this case, he quickly (about three feet)
fades out; the vision, of course, vanishes as he does this. The
operator must continue turning with his hand over lens or
shutter closed until he comes to the full count of his scene as
counted the first time he ran the film through the camera. The
vision and scene are now finished.

H the vision is to appear against a light object such as a white
hospital wall or a hook a different process must be used.

The film is set the same as heretofore, but at the point where
the vision is to appear a piece of dark cardboard is slipped in
front of the lens in a slot in the sun-shade or hood to a point
previously determined and with a pin stuck through the card so
it cannot go too far. This is prepared before the scene is taken.
It is called a comer vision and the card being passed in front of
the lens while count is going on and crank turning, will cause a
gradual shadow to grow in one of the comers of the picture which
will form a background for the vision which is taken later.

If the vision is to disappear at a certain count the card is
merely drawn away from in front of lens at that number. The
time occupied in placing and drawing the card should be about
five seconds or five feel. After taking the full scene it is now
important to take a test piece. This is taken with the black
card in front exactly as it was for the vision and about three
feet should be taken for the test. Tliis is now notched — opening
the camera to do so> and just above the notch written in pencil
on the face of the film '*Test on this end. vision."

The piece of film is now taken to the dark room in its magazine.

873

MOTION

PICTURK PHOTOGRAPHY

of course, and there rewound, a piece of the end being first torn
off and laid aside for the moment. After the tilm is rewound
it is placed in magazine ready to be placed in camera and the
vision part taken. Before going further the test must be de-
veloped. This can be done by the laboratory but to get it
quickly I advise every cameraman to have, in his dark room a
small jar of strong developing solution and a small jar of hypo
fixing bath. He dips the test piece of film into this and dcvelopcs
it and fixes, after which it is rinsed in running water and hung
up at a window to dry wihich it will do within an hour if weather
is dry.

When ready to place the vision this test piece of film is placed
in the camera the same position that the film will occupy — viz.,
upside down and with the emulsion towards the lens. The
ground glass is slipped in back of it and the film pulled up or
down until the claws or pins engage in a perforation which will
bring the film into correct frame when viewed through the mag-
nifier or focusing aperture.

The operator can now see the shadow made for the vision only
in this case it will be clear film — ^boing a negative. He can now
adjust his camera so that the vision occupies this space and by
means of diaphragm or black tape or cards as heretofore he can
block out all the parts of the picture except this comer where the
vision ;^>pea^s.

He should now remove the piece of test film and focus on the
groimd glass for sharpness. Then place the film in camera and
set it to the point previously marked as heretofore and CLOSE
THE LENS. He now begins the count and at the proper count
fades in the vision as previously explained.

But we will assume that the vision is not to be in a comer but
in the center of a white page— as a letter.

To obtain this a piece of clear glass is used with a small patch
of black paper pasted in its cenicr. This glass is moved about
until its proper position is secured by means of the ground glass
and then it is marked so it can be replaced in this exact position
later.

The film is now placed in camera and marked so the same posi-
tion can be obtained when run the second time. We will suppose
that ten feet arc to be run before the vision appears. The film
is run up to ten counts and from ten to fifteen counts rhe dia-

274

TRICK-WORK AND DOUBLE EXPOSURE

phragm in the lens is slowly closed — in other words — a Cade-out
is made.

The belt on magazines is now reversed and WITH LENS
STILL CLOSED the film is wound back five feet (not the whole
way this time). The belt is now changed back again and the
piece of glass with spot in center is adjusted. The lens is still
closed. The operator now begins turning again and counting
from the point he turned back to, ten in this case, and at same
time performing a fade-in. This will cause the dark spot to
gradually appear on the letter although the letter or page does
not change at all. A test is made at the end of the scene as
heretofore to enable the cameraman to place the vision at the
correct point and to assist him in blocking out all other objects.

The vision is then photographed as heretofore fading in at
the same count at whicli the black spot was faded in. The black
spot must be of sufficient size to accommodate the vision.

All numbers and counts etc., should be marked down in the
cameraman's note-book immediately and not left to memory. It
is easy to forget or become confused about numbers.

One of the best methods for keeping memoranda of numbers
is to mark them, with lead-pencil on the film itself — (hat is — on
the loop that is exposed when camera is opened for focusing
and just before the scene that they refer to. For instance:

Mark on film something like this:

Vision — May asleep in chair sees face of mother
Face fades in 30 to 35
Face fades out 60 to 65
Scene runs to 85
5 ft. test on end.

It is sometimes not convenient to finish the making of the
vision the .same day the first part is taken. If some time will
elapse between the first and second takes the film may be removed
from the magazine, rewound and canned. This can must be
carefully labeled and set aside where it will not be sent to the
laboratory by mistake.

Cans should be labelled somewhat like this:

Vision No. 67 (or whatever number scene is).
May asleep in chair sees face of mother.
Counts in notebook (or on film end).
Rewound (or not rewound yet).

275

MOTION PICTURE PHOTOGRAPH

If a test has been made and developed it should be taped on
top of the can so one can see at a glance what the can contains.
2oo-£oot cans are good for this purpose as they take up less room
than the larger 400-foot ones.

A dissolve is one scene diffused into another. It is accom-
plished by merely making a fade-out and a fade-in overlapping.

For instance, if the first scene fades out at 20 to 25 — the
cameraman merely winds back the film five feet (with the lens
closed) and then fades-in for five feet while turning forward
again on the other scene.

It win be found that dissolves arc more perfect if they overlap
more than normal. That is to say if a fade-out ts made from
20 to 25 it is a good idea to turn back to 19 (instead of 20) and
to begin the fade-in from there to 24 (instead of 25). This will
prevent any tendency of the film growing dark where one view
fades into the other.

As with visions a memo should be made of numbers at which
dissolves occur, and, if the second scene is not made the same
day the film may be canned and set aside.

Enough blank film must, of course, be reserved so that the
second scene may be dissolved onto the first and an ample amount
left for the succeeding scene. For this reason the director
should tell the cameraman about how long he expects his second
part of the dissolve to run, or, in case the second part is taken
first, as is often the case, how much blank film shall be left in
first part of roll to accommodate the first scene.

Sometimes as many as five or six scenes are dissolved — one
into another, in which case the cameraman must calculate iwhat
the total footage of all the scenes will be and allow enough film
on the roll.

In making a number of dissolves — one into another — the
cameraman must be very careful not to get his numbers mixed.
It is well to take all dissolves twice, so as to have a second take
in case of a mistake at the time the first is taken. These should
be marked first and second take on the film before the camera is
closed.

One cameraman had ten dissolves to make — one into the next.
He went along and had nine all right but became confused on
the tenth and, of course, the lot were spoiled. This work took
ahno&t a week to do and probably cost the studio $500 or more.

TRICK-WORK AND DOUBLE EXPOSURE

Often the director will call for a dissolve into a close-up. To
do this quickly — first focus the long shot and note the mark on
focusing dial at which needle points. Now move the camera up
to the point from which you wish to take the close-up and make
a mark with chalk where tripod legs meet the floor. Set focus
and note the indicator dial. Now move back to long-shot posi-
tion which may also be marked in chalk, set focus dial back to
long-shot mark and go ahead. When director calls "dissolve"
fade-out for five feet, rewind with the lens closed, move up to
marks previously made, reverse belt, set focus to the close-up
point previously determined and point camera correctly by
means of the finder on side. When ready say so to director and
when he says "go" begin turning and at same lime fade-in for
five feet (ten turns).

If now the director wishes to dissolve back to the long-shot
and says "dissolve" repeat the above except in this case set the
focusing dial back to the long-shot position and move camera
back to original position, adjusting the camera correctly by
means of the finder.

Miraculous appearing scenes where the costumes or surround-
ings change before the eyes, are often required. For example :
suppose the actor's ordinary costume must change to the uniform
of a soldier. To do this, run to a pre- determined number, say
30 — and then fade-out The actor has been previously instructed
that at 20 he is to hold absolutely still until told he may move.
After having faded out from 20 to 25 stop the camera and care-
fully mark the actor's general position. The position of his feet
is marked with chalk and the position of his. hands on table is
marked likewise. The place his head occupies is marked with
pencil on the ground glass of the finder and care is taken that no
one moves the camera in the slightest degree. The actor is now
told to go to his dressing room and put on his uniform which
must be all ready for him before the scene is started. While he
is doing this the cameraman* reverses the belt, winds back five
feet with the lens closed and awaits the return of the actor.
When actor has made his change he is placed in exactly the same
position as he previously was, his head at same place on ground
glass, his hands on the chalk marks which are now carefully
erased and his feet exactly as they were. It is never possible
to get identically the same pose, but the blur caused by the dis^

VOTIOII FICTUftE PHOTOGRAPHY

aohre iridi it> cwnfiif Id tkt eye will cover any snail changes.

When attor a pbced be s> MMmirtH to bold perfecUy still
ttniiJ yoa cobK frvc; After tins be m^ do whatever the director
wiibet. Torn forward and at lame time fade-in for five feet
tod ooadnoe tunuag ualil aocoe i* ended.

Mtntattires are fag|MeJuUy med to simulate wrecks of trains,
b(M(% etc. The success of tbese tricks depends a great deal upon
(be sksU wHh which the nunxattire-inan boilds his toys. Some
nukerf of these dinuDUlrve taod^s are very skillful and can
construct a war-ship, castle, bridge, or whatever is required,
correct in every detaiL In using miniatures on water in a studio
tank, take care that no bubbles form as they would appear very
large — about the size of hogsheads compared to the model-shifv^
and give the trick away.

A Rfcat deal depends upon the lighting used on models. It
eliould not be too har^h as that tends to throw details into strong
relief and the possible crudeness of the object is exaggerated.

Ihirninf^ trestles are usually soft wood saturated with turpen-
tine wliicli produces a black smoke that photographs well.

Explosions arc usually produced in miniature with the use
of i\(m burning flash-powder.

Win<l comes from a nearbye electric fan, and rain from an
overhead tank in which a number of small holes have been
punched or from a hose with a spray nozzle.

Toyi and dolls may be brought to life and chairs, tools, etc,
caused to jx-rfonn any actions th& operator may desire by means
of the «tui>-motion crank which has been explained. \Vhen tak-
tnir B stop-iuotion of a doll walking, the cameraman turns one
revolution thereby producing one picture — he then advances one
ol the doU's feet a very little and takes another turn on his
rnmrrn. lie then gives the doll's foot another move forwards
nnd nnother lum of crmk and so on— endeavoring to produce
lifelike motions. It must be remembered that in stop-nx>tiotn
work the light must cither be much weaker or dse the shutter or
diaphragm be closed down enough to make allowance for the com-
pnrfttivrly slow speed at which the pictures are taken.

An illusion that is easily explained is that of a man ctimbing
up the side of a building. He lifts himself up post windows and
balconies until he reaches the roof. In tfaU case, the boose's
aMe is built on the ;Kudio floor— Oat against the floor sod not

TRICK-WORK AND DOUBLE EXPOSURE

upright. The camera is taken up into the girders at the top o{
the studio and pointed straight down. The man who does the
climbing docs not really climb but merely drags himself over the
floor wliich, in this case, is made to resemble the side of the
house. When viewed on the screen the house, is of course, vcr-
ticlc The illusion is complete.

This same method is used with many different backgrounds
painted to resemble the bed of the ocean or the moss and ferns at
the bottom of the sea in perspective. One of these is laid on
the studio floor and a woman attired as a mermaid drags herself
around with the motion of swimming or is swung on a thin wire
a few feet above the floor. To finish this illusion the same piece
of film should be again run through tlie camera. The second
time the film is run through the camera, the latter is focused upon
a small flat aquaritun in which fish are swimming. This
aquarium should have a flat glass side and be backed up with a
black cloth on the side furthest from the camera. The camera
itself must be covered with black cloth leaving only the lens ex-
posed through a hole cut in it. This black cloth should cover
the cameraman as well otherwise the glass of the aquarium will
reflect evcr>'thing in front of it and the camera and anyone near
it will appear In the finished fihn. After the second exposure, the
film is developed and the effect will be that of a woman swim-
ming among fishes at the bottom of the sea.

The warning about reflections in the lens that are given above
also holds in photographing a close-up of the human eye. In
doing this, a cameraman must be very careful how he places the
lights or he will have a reflection of every light in the studio in
the curved lens of the eye and, when this is enlarged to fill the
screen, the reflections will be plainly visible. Again, in this case.
the camera and operator must be in black or covered (except the
lens and the operator's eyes), with black cloth.

Actors often have to play dual roles — that is, play two char-
acters in the saine scene. To make one actor talk to another
figure — the latter being himself — an instrument is used to split
the stage or frame in two sections. This is an opening in the
sun shade — about four inches in front of the lens in which two
black cards slide so that each card can be moved across until
one-half of the ground glass is black or shaded. The action is
first carefully rehearsed so that the actors know exactly what to

sra

JfOTrON PICTURE PHOTOGRAPHY

do at certain counts. After one side is taken the film is rewound
with the lens closed and the other card moved across until it just
touches the first one and the first one is then removed. This
shades the side of the film just taken and exposes the other side.
The lens is now opened and the other side taken. If the cards arc
manipulated carefully and the actors are careful not to cross
the line or the blend of the two sides the illusion will be perfect
and no division of the stage will be seen.

The action, in this case, must be carefully timed so that the two
figures will speak and answer at the proper instant.

There will be, of course, a space in the center of the picture
beyond which neither person may venture or they will simply
vanish. If, even, a hand is passed across this forbidden space
it will disappear. There are, however, methods of crossing this
dividing line and having one of the figures follow the other off the
stage. The action goes up to a certain point and one figure
leaves the stage. We will say it is the figure on the right. Left
now holds his position for a few moments and follows off.

This is accomplished by having a certain count agreed upon
at which right leaves and is OFF stage. At exactly this point
the camera is stopped. We will say it is count 40. The film is
now reversed and run back to start and the left side taken. At
count of 40 the actor known as "left" must remain perfectly
still. That is hold. The camera is stopped and the mask cover-
ing ha]f of the lens is removed. The camera is now started and
the actor "left" has the whole stage to act in if he desires.
When the film is developed there will be a fogged place or possibly
a few inches of black film where the stop was made, but this is
cut out and the ends of the film carefully joined together with
cement. If this is done skilfully no jump will appear on the
screen where the mask was removed.

Triples or three persons on the screen at the same time, the
three persons being one and the same nidividual are made by using
three masks, one in the center and one on each side.

An example of this is a scene showing a man at telephone on
one side of the screen, a girl at 'phone at the other, and between
the two, a panel of a city with telephone wires.

The two sides are usually taken first and then the mask set
and the outside view taken. This means that the film must go
through the camera three times or that the two outer scenes may

980

TRICK- WORK AND DOUBLE EXPOSURE

have been taken at ihe same time by placing the two sets close
together the centre exposure masking the junction of the two sets.

A vision in a mirror is done by means of a piece of black
velvet fastened to heavy cardboard which is made to exactly fill
the frame of the mirror. The lady seated in front of mirror
sees her own reflection up to a certain point when suddenly her
reflection changes to a vision of her enemy — a fierce looking man.
We turn the camera up to the point where the vision is to appear.
In this case let us say 20 to 25. Fade-out from 20 to 25 having
actress hold her position <lunng fade — and not move afterwards.
Quickly wind back five feet of film as heretofore and at same time
have stage-hands fit the black velvet into the mirror frame.
When this is done fade-in and actress can now move again and
register horror at what she sees in the glass. After scene is
ended be sure to take a test to show exact location of the mirror —
otherwise you may have great difficulty in placing the vision
squarely in the centre of it.

When making the vision fade-in on the film from 20 to 25
and be sure to have plenty of black cloth back of the man posing
for the vis'ioT] and to block out that part of his figure which conies
below the line of the mirror frame else the vision will spread all
over the dressing table or whatever the piece of furniture contain-
ing the mirror may be.

A good method of masking out mirrors is to take a piece of
the test and cut out the mirror opening carefully and then opaque
the piece of fiJm with indian-red water color. Place this piece
of film as a mask in the aperture back of the lens and in front of
the film and the only part of the film you will expose will be the
mirror. The mask must be carefully placed by means of a piece
of the same test. For this reason make plenty of test of a mirror
scenc.

Ghost or spirit figures are often required. First take the regu-
lar scene and then rewind to the beginning. Now have all ob-
jects in the set covered with black cloth. Velvet is best. Sec
that camera is not disturbed in the slightest or moved even the
slightest particle. A black drop is used to hide the background.
In other words everything is black. The actor portraying the
ghost now enters the scene and the film is run through again.
This actor should not be dressed in black or he will not show.
Ghosts are always to wear something light otherwise only their
faces would be visible agaiost the black ground.

2»l

MOTION

PICTURE PHOTOGRAPHY

The above effect will produce a visionary figure — one that can
be seen through or is partly transparent.

To cause the illusion of a soul arising from the body and float-
ing away, the figure is first photographed to end of scene and the
film re-wound. We will assume that the figure from which the
soul emanates is to be seated in a large arm-chair. At a cer-
tain count (say 30) the actor must be in this chair and remain
seated there until the end of scene.

After rewinding the film to the start cover everything in the
set with black velvet and have the actor sit in the chair again.
Now close lens and turn to 30. At the count of 30, fade-in while
simultaneously the actor slowly rises from the chair and with
a gliding motion crosses the stage and exits.

The effect will be of tlic man remaining seated in his chair all
through the scene while the spirit-like figure of him will rise
from his body and move slowly away from the living being and
out of the picture.

An illustration or picture in a book may be required to come
to life and move. In this case a girl reads a paper showing an
illustration of the "toughest tenement in New York" she is shown
reading and the scene jumps to a close-up of what she sees in
the paper. Show section of page with view of front of building
— people passing and children playing in street. This is a still
picture. Suddenly the people begin to move and the children to
run about. This is accomplished by taking a motion camera and
a still-camera to the same location and setting them to focus on
the same scene.

About twenty feet arc run in the camera with lens closed and
at the count of 20 the cameraman starts to fade-in and at same
time his assistant snaps the still-camera. The scene is now run
to end. After returning to the studio the still picture is de-
veloped and a print made of it. This print is now fastened up
on wall and the motion-camera focused carefully on it. The
film has been rewound to start and the cameraman now photo-
graphs the still up to count of 20 when he fades-out. If he does
this at the correct count the still picture will merge into the mov-
ing one and the figures will appear to come to life.

Some very astounding illusions can be performed by double
printing.

We wish to show an airship sailing up Fifth Avenue, New
York, only a few feet above the heads of the people :

rr&ICK^WORK AND DOUBLE EXPOSURE

First, a good view of Fifth Avenue is taken, looking straight
or nearly straight along the street. This is developed but not
printed. The negative is laid aside for the time being.

A miniature airship is now built and suspended by two WHITE
threads so that it can be pulled towards the camera along an
overhead wire for quite a distance — in this case about 15 feet.
Back of the airship and covering the entire field of the lens is
stretched a white sheet or background which must be well ligiited
so that it wil! photograph brilliantly white. The camera is now
set so that the airship will, when drawn along the wire grow
larger and finally pass out of the top of the frame when it is
quite close to the camera. The focus will be set about midway
of the airship's travel and may either be changed as the airship
approaclies or left stationary. There is little advantage in this
case in changing focus. The airship itself must be painted gray
or drab so that it is visible against the pure-white backing.

After this piece of film has been taken it is developed and
the result should show the airship approaching against a jet
black ground (this being a negative).

A print is now made from this negative on positive stock which
must be printed so deep that the airship, instead of being gray
or drab a.<i in the original, appears black or nearly black. In
other words a very dark print is made. This should show a black
or nearly black airship approaching against a pure-white or clear
film background.

We are now ready to superimpose the airship against the back-
ground of Fifth Avenue. The piece of negative of the .street is
placed in the printing machine and against its face is placed the
piece of print of the airship with the clear film backgroimd. A
mark is made on the perforation of each where the start is made
and then a piece of unexposed positive stock is placed in t!ie ma-
chine, its beginning marked and all three are run through the ma-
chine together. If tin's strip of film were now developed it would
show a picture of Fifth Avenue with a white airship coming up
its length but we don't wish this to be the case. Therefore, we
taixfi the piece of negative of the airship with jet-black back-
ground and match it up with the print of same so that the begin-
ning can be made to correspond with the beginning of the print
and place it in the printing machine together with the piece of un-
developed positive stock which we have just printed. These two

SB»

MOTION PICTURE PHOTOGRAPHY

pieces are now run through the machine and the film is then de-
veloped as regular positive stock.

The result will be a perfect illusion. Every detail of the ship
will show dearly and there will be no visionary effect since ihe
print of the airship was run through the printing machine with
the negative of Fifth Avenue and Ihis served as a mask and left a
clear space which the final negative of the airship followed iden-
tically. Every rope and spar will automatically find its proper
place on the masked film and imprint itself there.

To insure that llic airship travels in the center of the street
or where desired a piece of the negative of Fifth Avenue first
taken, can be placed in the ground glass aperture when focusing
on the miniature airship and the camera so arranged that it wiU
be the right size and travel cm the wire in the proper direction.

This trick need not be confined to miniatures. By building an
airship large enough to accommodate living persons and having
the ship so arranged that clear sky is back of it to serve for the
white background, people can be seen moving about on the deck
of the ship as it sails up the street.

The student will, by using his imagination, think of a variety
of original ideas that can be carried out by this method.

For instance — A man leaps from one building to another while
far below him can be seen the street and its traffic. The view
of the tops of the two buildings is first taken and the street
lowing below. The jump itself is performed from one white
covered box to another in the studio against while backing and
if the leap is to be exaggerated tlie actor is merely swung on a
steel wire painted white. The position of the two white boxes
is arranged by placing a piece of the negative of the roofs in the
camera and arranging the boxes to fit the exact position of the
edges of the roof.

.\lso a man can be shown running along a street at the rate
of a hundred miles an hour by this means:

A view of the street is first taken from an automobile traveling
along. This should be taken side view to the street and the
camera turned slowly so that the streets will apparently fly past
very quickly. This negative is later used with one taken in the
studio allowing the actor running on a tread-mill painted white
and against a white backing as heretofore. Any number of ap-
parently impossible effects can be otained by this method. There

384

TRICK-WORK AND DOUBLE EXPOSURE

is no end to the variety of effects such companies as Keystone,
Sennett and others obtain by its use.

Scenes showing lightning striking people or buildings are
often needed. An actor comes to the door of a house during a
storm, he is immediately struck in the chest by a bolt from the
heavens.

This is done by counts. The perforation is marked so film
can be reset in camera to start. At count of (say 30) the actor
is to receive his supposed stroke. So he must be at the door by
about 28 and just as the cameraman shouts 30 the actor must
recoil as if struck and fall. The film is then run to end of scene.

A test is now carefully made — the actor returning to as near
the position he occupied when struck as possible. It is well to
take the above scene several times as much depends upon whether
the actor returns to his exact position for the test.

The film is now re-wound and the test developed.

This test will be placed In camera back of ground glass later
to find the correct place for the bolt of lightning to strike.

You will now need an induction coil, such as is used for X-ray
work, capable of throwing a six-inch spark. This can be rented
from the Marconi Wireless Telegraph Co. or obtained from
some X-ray operative or electrical store.

It is set up and covered by a black velvet cloth so that only the
two balls between which the spark jumps are exposed to view
and these are painted black with non-lustre varnish.

The camera is now adjusted so that one of the balls is placed
against the actor's breast on the test — as seen in camera, and the
other one is against a post in the sky from which the bolt comes.
The switch on the electrical machine is then closed and the effect
of the jumping spark is noted on the ground glass and test If
it looks natural and effective the bolt is ready to photograph.
It is advisable to throw the spark itself a little out of focus as
this will give a sort of halo to the bolt and make it look more hot
and natural.

Everything being ready the film is placed in the camera and
set to its proper mark and the lens opened. The cameraman
starts turning, counting at same time. As everything is draped
in black he is getting no picture. There must be very little light
in the room however. At the exact count of 30 the assistant
presses the switch or key for just one iostant aad the camera-

285

MOTION PICTURE PHOTOGRAPHY

to sec if

toiliecadof :

and tbcbolt faas been

bciim the other takes are finished
i ri^A. It is qnite a tiickf piece of

When B^i^c acaats oa board ship or is a ship's interior set
tte cfcct Bmaiui k das of a ifa^ ncUap at sea. Place the
cairra, asdeaaws on the tripod-tiiL While turning the crank
have yoar ayg'sfant aiao t&ni the rikaie haadfe several tnnis ooe
way and tfacs rcrene the madam. Thk ■»( be dooe steadily
and oot too Catf, sever jerloKr.

Cu^ifiia effects M ai^ are obcaiiied faf setcral methods.
The aaost cffcdnc 1 crcr ohiaipffrf was fay ''tT'T ^ boSe in the
CTQand ateoc tvo feet deep aod settias aa axe fight m this, with
the wire kadioK vmay ixam the ticaiA covered by a byer of
gitniBn Tnc are was tiued so ttat its t^rs were thrown vp^
ward into the faces of the men ^luuped anMnd the spot. In
front of tbis trench, that iSa on the snc luwiiUi oie camera, were
placed a few logs of wood aod sane leaves satmated with
kerosene. The backsroond consisted of aa old tree trunk stand -
np in the studio yard where this soeoc was taken.

The camera was focused on a flash-teap bnlb held by my as-
siMaaft directly over the spot where the fire was later ignited. I
abo measured the distSDce with tape and checked op on the cali-
brated camera scale. Allien aH was ready the k>gs were lighted,
the cnrrent switched on in the arc and the men gathered aroond
the fire. I had the dimiuagyi of my lens wide open — f.^5 and
niaillii I at oomaL I tnmed a hctk shwriy about H normal
speed. The podtiTe film was tinted rod and w«s all that could
be desired.

Another mrthod, where thcHiiily cannat be nhtainrd. is to
sink several slow bmning nagnesimn torches in the hole
in the gromKL These are made by Xe«-man of Xew York and
are quite expensive so that, wherever possible, electric arcs
sfaooid be nscd- Also, the flaics only bora about two minotea
and emit volmnes of smoke which often entirely hide everything
from the lens.

Smoke-pots are a solphnTOus combinarinn of powders that can
be purchased at any theatrical soppiy boose and are used to
"fake" fiio ia daytnne. Several anoke^pots hgbted bdnod

TRICK-WORK AND DOUBLE EXPOSURE

windows will produce volumes of thick, yellow smoke that will
roll through the window giving the effect of a hot fire within.
They are harmless inasmuch as they never produce any real
amount of heat nor can they explode. The smoke they pour
forth quickly disappears. It is, however, very non-actinic and
photographs eflFectively. It is also used by "miniature" workers
in miniature volcanoes. When these effects are tinted red they
are most convincing.

987

Chapter XVIII
"COMPOSITION BY J. C. WARBURG

UNDOUBTEDLY the most important phase in the produc-
tion of a picture is the choice of subject, and in no case,
paradoxical as it may seem, is this so important as in
pictures which, to the "man in the street/' have no subject.

The fact that a particular view or landscape is pleasing to the
eye is not necessarily a reason for its being pleasing in a picture*
for there is an essential difference. Nature is an unlimited, un-
bounded reality, possessing color, relief, solidity, distance, atmos-
phere, and other attributes, which c^n only be represented, not
reproduced, in a work of art. While nature is an entity, art is
an illusion, a symbol, based upon and recalling nature, but appeal-
ing to us in a different way. Though lovers of art are also lovers
of nature, they do not enjoy a visit to a picture gallery in the
same way that they enjoy a walk in the country. A picture,
however real in its illusion, can r^resent only a small portion of
nature — a small slice of it.

Here we have the first reason why a pleasing landscape will
not necessarily give a pleasing photograph. The photograph has
an outside boundary, a hard edge, where it is cut out of nature.
The eye cannot wander beyond this edge and find fresh beauties
as it can in nature. We are brought at once to the formal limits of
our subject.

If the eye strives to go beyond the limits of a picture, the
result will be restlessness and want of completeness. The objects
at the margins must not be so attractive as to lead the eye out
of the picture. They should not suggest the violent exclusion
or excision of parts of nature. To give instances, great circum-
spection is necessary in introducing overhanging branches of
trees not themselves included in the picture, or of showing a tree
without giving an indication of the ground from which it grows;
do not infer that such objects are never allowable. Each case
must be considered on its own merits.

A picture has a two-fold aim. It aims not only to represent
nature, but also to be a decorative design. The lines and masses

S88

COMPOSITION BY J. C. WARBURG

of the picture must have a certain balance or rhythm in order to
please — hence the importance of "composition."

The photographer, unlike the painter who can shift objects
and place them where he Hkcs on the canvas must find his de-
sign in nature. He has to move his camera right or left, back-
wards or forwards, up or down, until his focusing screen in-
cludes a pleasing design.

The problem is to fit the prcturc into the space satisfactorily.
The picture must not look as if it were cramped and forced into
constraining limits. It is also necessary that all parts of the
picture help tlie general effect and belong to it. Extraneous
objects, confliction of lines, division of interest, all detract from
the force of the picture.

The general design should be simple. It should resolve itself
on analysis into a few simple forms, or groups of forms, rather
than into a heterogeneous mixture of light and dark patches and
bewildering lines.

If we examine one of those pictures which attract us in a
picture gallery, interesting us even before we have made out their
subject, we shall find generally that it is built on well-marked but
simple lines, with well massed light and shade.

The fact that the groundwork is simple has little or nothing to
do with the details. These may be few or elaborate, yet the
general effect of the picture, considered as a design or decorative
piece remains much the same.

The subject of the picture is its most important and con-
spicuous part. It is generally placed toward the middle of the
composition with the subsidiary objects leading to or balancing
it. Unless one portion of the picture is more interesting than
the rest, there is danger of the eye being attracted first to one
side and then to the other. This may lead to a restless or monot-
onous effect By having a principal object, supported by lesa
important elements the interest is concentrated. Such a prin-
cipal object need not be very large, nor is It necessarily im-
mediately recognizable as the artistic motive of the picture. It
may be merely a splash of sunlight on a white house, or a branch
against a white cloud. In many pictures, depending for their at-
traction more on the mood and expression of the whole than on
the actual subjects treated — on tone more than on design — it is
often diflScult, if not impossible, to pick out one portion of the

S80

MOTION PICTURE PHOTOGRAPHY

picture as undoubtedly the principal object. Generally, however,
such a centre of interest is discoverable.

Many authors have sought to determine mathematically the best
position for such principal object and their results may be useful
as suggestions rather than as rules. It has been stated, for in-
stance, that if a picture be divided into three, or into five, equal
parts in both directions, the points of intersection of the dividing
lines will be the strongest positions for the principal, and second-
ary objects. This is rarely tlie case, however, and it would be
correct to say that such objects are rarely quite central or quite
evenly balanced.

If the most important parts of the picture are placed toward
the centre, it may be asked what should be placed in the mar-
gins. Generally speaking, the base of the picture should form
a sort of threshold to the picture, a piece of ground or herbage,
upon which in fancy we may step, the more nearly to examine
the picture proper. Sometimes it is a road or path leading into
the picture, sometimes the lower leaves of a plant which rise
upwards, something soft and harmonious rather than detailed
and emphatic.

There is a stnry of a French painter, who painted a picture
with a wonderful foreground. He showed it to a friend, who
was so full of admiration for the foreground tliat he could hardly
look at other parts of the picture. Seeing this, the painter seized
a brush and painted out most of the details, reducing the fore-
ground to its simplest expression, in order that it might fomi
but one item in a harmonious whole, instead of ovcrweighing
Other parts of the picture and detracting from the effect.

Foregrounds, then should be unobtrusive. They should not
contain great contrasts or be too sharply detailed.

Nevertheless, a note of contrast, such as a strongly lighted
rock or tree-trunk on one side or other of the immediate fore-
ground, may often be of value in throwing back objects behind
it.

The foreground should not form an isolated, uninteresting
patch — it should lead into and blend with the picture. Some-
times we see a more or less rectangular space of foreground,
almost detached from the rest of the picture, a space which cotild
be trimmed off without making much difference. Nearly always
ftuch disconnected islands in any part of a picture detract from
the unity of the composition.

S9Q

COMPOSITION BY J, C WARBURG

What has been said of the base applies in less degree to the
top and sides. One side generally contains some important fore-
ground object placed a short distance from the edge.

Although few photographs contain "lines" such as those in
pencil drawing, yet Line is a most important matter in every
branch of picture -making. If we examine a good collection of
etchings, we shall notice what an immense power line possesses.
The etcher has neither the color of the painter, nor, to any great
extent, the gradation of the photographer. He is largely de-
pendent on line, and uses its power to the utmost.

The photographer often overlooks the intportance of line.
Line in a photograph is not necessarily an actual line, such as a
wall or paling, the base of a building or a path. More often it
is the edge of something, a ridge of hills against the sky, or a
dark bank of trees against the lighter distance. Often it is dis-
continuous: a row of post& or trees, a flock of sheep going down
a road. Whatever it represents, and however it occurs, a fairly
well-marked line insensibly draws the eye along it.

If the line is a softly undulating one the eye follows it easily,
and without effort, and the result is pleasant and soothing. If,
on the contrary, it is broken and jagged, the eye has mare
trouble in following it, and the resulting impression is one of
stress or movement.

We all know the peaceful calm of a quiet sunset over the sea,
the straight horizon and the parallel banks of cloud above it,
or tlie restfulness of softly undulating downs, with, perhaps,
the gently curling smoke of a farmhouse in the foreground.
Compare these with the wildncss of a billowy sea and storm-
torn clouds, or the jagged outline of a granite crag, or the
gnarled and twisted trunks of windswept trees. The mental
effect is entirely different: Gentle lines, especially where they
are nearly horizontal, are connected in our minds with peace;
jagged and broken lines with unrest

It may be objected that the photographer cannot alter the lines
of a landscape. Nature has formed them for him to take or
leave. If that is so, he can, at any rate, exercise his power of
selection by taking a picture only where the lines are suitable,
and refraining from exposing when they are not. But that is
hardly the case. Nature provides the lines, the photographer
can vary them, if not to an unlimited extent, at any rate to such

181

MOTION PICTURE PHOTOGRAPHY

an extent that out of the same subject he can often make many
dissimilar pictures.

Let us take as cxan^le the case of a well-marked path leading
past a tree, with the distance beyond. The photographer erects
his camera in the middle of the path pcnniing at the tree; re-
sult, the tree in tlic middle of the picture, the path widening out
towards the bottom of the picture. By turning the camera on
its tripod the tree and lines are brought more towards right or
left, but their shape is unchanged. Move tlie whole camera a
yard to one side, however, and a marked change occurs. The
path now starts from the comer, and curves towards the middle.
Move the camera another yard in the same direction and the
path will now enter from the side of picture, curving past the
tree.

The horizon line is a line of great importance. Its position in
the picture has a great influence on composition. All level or
hori2ontal lines which recede from the eye terminate ultimatc'.y
in the horizon, or would do so, if produced sufficiently far.

The horizon is on the level of the eye or, in the case of a
photograph, of the lens. In order to obtain a true perspective
of a picture the eye must be on a level with its horizon. If the
picture be above or below the eye, the camera must be lilted for-
ward or backward, in order that the line of sight from the e>e
falls normally (i.e., at right angles) on the horizon of the picture.

Horizontal lines above the horizon line, therefore, slope down
towards it. while those below slope up. The line of a wall of,
say, 4j^fcet high may, therefore, be made to slope upwards or
downwards on the ground glass, according as we place our cam-
era at a height of 5V2 or y/2 feet respectively.

With regard to the position of the horizon in the picture, the
division of the picture into three or five comes into play here.
The horizon line seldom looks well in the middle of the picture,
for it then bisects the picture, making it too symmetrical and
geometrical in arrangement. A much more usual position is a
third or twofifths from the bottom. In most old pictures and
in pictures in which the sky forms a prominent feature, the hori-
zon will be in that neighborhood.

The influence of Japanese art. with its strong decorative char-
acter, or the desire for change from an arrangement which had
become almost conventional, has led to the frequent use of a

Sf92

COMPOSITION BY J. C WARBURG

high horizon, about one-third or two-fifths from the top o{ the
picture. A high horizon gives greater scope for decorative lines
in the foreground.

The photographer raises the horizon on his film by tilting the
camera.

If most of the lines in a picture slope in the same direction the
effect is uneasy. There is a feeling that the whole picture is
sliding downward. To obviate this it is necessary that the sloping
lines be balanced by opposing lines sloping in the other direction,
or that some strong object be included to stop the lines sliding out
of the picture. Although the lines are not actually sliding, the be-
holder imagines they are. Just as we stop an object from sliding
by placing a heavy mass in front of it, so we can neutralize the
the effect of sliding in the picture.

On the slope of a hill or watershed where most of the lines
tend to slope in one direction, it may not be possible to find con-
trary lines of hills, but a foreground rock or clump of bushes, or
a house or tree in the mid-distance, may often be secured in
the field of view. I'ailing these, or in addition to thorn, cloud
forms may be secured, which will give the necessary balance of
line.

For another reason unbalanced sloping lines arc undesirable.
They lead the eye out of the picture. WTien balancing lines arc
introduced, on the other hand, the eye is led toward the middle of
the picture where the lines join or cross^ The tendency is for
the eye to follow converging or disappearing lines toward their
converging end, rather than to follow their radiations toward the
edges of the picture.

Design is not only a matter of line, Inrt also of mass. As we
may have an unbalanced effect if all the lines slope the same way,
so also we may get an unbalanced effect if all the larger and heav-
ier masses are on one side of the print. Here, again, the mental
effect is comparable to the actual effect of mass or weight. A
"heavy" shadow aj^ears to drag down one side of the picture,
just as a heavy weigiit would drag down one side of a pair of
scales. The blacker the mass, the heavier its effect — a property
of which we may make use in order to balance a large mass of
low tone on one side of the picture by a smaller mass of still
deeper shadow on the other.

Large masses not too much chequered and contrasted by light

SS3

MOTION PICTURE PHOTOGRAPHY

and shade give dignity and breadth. White and black are uncom-
mon in nature, and should be discreetly used. The highest light
in a film, even if it is not absolutely clear celluloid, will tell better
if it forms but the climax of a modulated mass of light tone (espe-
cially if contrasted by a strong dark in its neighborhood) than it
it is a flat tone of unmodulated white.

Mass, and light and sliade, are almost synonyms in mono-
chrome. Therefore the lighting of the subject, tlie time of the
day, the weather, and especially the presence or absence of sun-
light, have an overwhelming effect on the arrangement of mass.

A hill against the sky with the light behind it forms a dark
mass, wliilc the same lull in a misty atmosphere and lighted from
the front may merge into the general tone of the sky. We lose
not only the heavy effect of the mass, but also the strong line of
its edge. The lighting, then, is worthy of intense consideration.

The lights and shadows in pictures are generally found more
or less massed together than chequered over the surface — the
darker tones, for instance, at the bottom and one side, and the
lighter tones at the other side and top.

Where a strong dark juts out against a high light, or vice versa,
we obtain a contrast which is certain to attract the eye. Such a
point generally forms the central point of the composition. It
must, therefore, be well placed.

The most stable and solid eflfect is obtained by having large
masses, more especially dark ones, at the base of the picture,
support smaller or Hghter masses above ; on the principle of the
pyramid.

Too even a distribution of light and shade is apt to be monot-
onous, and inimical to concentration of expression. For this
reason, a landscape lighted from the front is generally less suit-
able for pictorial representation, than if lighted from the side.
Similarly, evening light, with its long shadows, has a breadth
which we may seek in vain at noontide.

A sky with brightly lighted cumulus clotids interspersed on
the dark blue ether — such a sky we get when a storm passes off
— ^is likely to give a much more interesting lighting to the land-
scape, than either a cloudless blue sky, or the dull grey of a
drejiry day.

Most potent of all in its effect on light and shade, is the
presence of the sun.

294

COMPOSITION BY J. C. WARBURG

Do not draw the inference that all pictures are best taken by
evening sunlight or after a siorni. The characteristics of such
ligliTing arc merely given. These matters have to be considered,
but they should be subsidiary to the carr>'ing out of one's artistic
intentions. Nature has many moods, and they arc all worth
portraying artistically.

To take an instance where some breadth must be sacrificed for
natural effect, the chequered sunlight of the leafy wood would
lose its gaiety and vivacity if the sunlight appeared in large patch-
es instead of small ones. One should endeavor merely to choose
a view-point, in which these small, overlapping images of the sun
on the ground are more or less grouped into masses of light. Also,
one should avoid their being scattered too evenly over the whole
picture, and try to arrange (by including a bit of sunless fore-
ground, for instance) that the sunny bit forms the center of at-
traction of the picture.

The proportion of light to dark in a lecture is a matter of indiv-
idual preference and of the effect desired. Rembrandt in his
work generally used much shadow, thereby enhancing the bril-
liancy of the lights by contrast. Tlie French Impressionists, on
the other hand, keep the whole picture light, thereby obtaining a
general luminous effect. If a picture contains light and dark in
equal proportions, the result is likely to be rather tame, in com-
parison with one in which either light or dark tones preponderate.

As in musical nomenclature, these differences arc often spoken
of as diflfcrences of key. Likewise, the tones of a picture, rang-
ing from black as the deepest tone to white as the highest, arc
comparable to the tones in music. The whole range of tones is
called the scale of tones, or scale of gradation. If the picture
includes all the tones from black to white we speak of a complete,
full, or extended scale.

From the photographic point of view, a full scale of gradation
depends on an exposure sufficient to give the shadow detail (the
low tones, without over-exposing the lights (the high tones),
coupled with a developement which gives sufficient contrast to
enable both black and white to be obtained in the particular print-
ing process employed.

It may be as well to note at this point that while line is almost
entirely a question of view-point, having little to do with lighting,
and being almost independent of exposure, mass is a question not

29ff

MOTION PICTURE PHOTOGRAPHS

only of view-point, but of lighting. Tone, though depending on
selection for its material, requires approximate exposure and de-
velopment for its successful registration.

Photographic composition is, therefore, of a threefold or four-
fold nature.

To return to our musical analogies: A picture containing many
deep tones is said to be in a low key, one containing a majority
of light ones in a high key.

Where there are a few gradations (or modulations, to use the
musical analogy) between light and dark, the range of gzudation
is said to be abrupt

The scale of gradation in nature between a light in sun-
light and a dark object in shadow is many times greater than the
range obtainable between black and white in a print. So great,
indeed, is the illuminating power of sunlight, that a piece of black
velvet in the sun may reflect more light — that is, appear lighter —
than a piece of white paper or other light object in the shade.

This being the case, it is obviously impossible to copy nature's
smie, except where only a very limited range of light and shade is
included in the picture. The best we can obtain is a compromise,
which will give us the illusion of nature and nature's lighting*
Obviously, there are different ways of approaching this problem.

First, let us consider the three cases in which we represent the
highest tone of our subject by transparent celluloid and the dark-
est tone by the blackest deposit of silver of which our print is
composed.

The first case is that in which all the tones of nature arc more
or less equally compressed in the scale of the print. The highest
light is white, the deepest shadow black, and the middle half-
tone is a medium grey in the print. This is the ideal negative
of the technician. It corresponds to a negative which, allowing
considerable latitude in exposure, has received normal exposure
and normal development. The result evokes no blame and little
praise. It is more or less impersonal and unexciting, and is
usually of more topographical than artistic interest.

The second case is that in which the shadow gradation is long
and extended, and the high light gradation compressed. This
form of treatment is suitable for subjects in which the greater
part of the picture is composed of dark objects. To some extent
it sacri£ce» the high lights to the shadows. It corresponds to veiy

:t)MP0SlT10N BY J. C. WARBURG

full exposure and suitable development. The negatives arc good
printers. It gives results of solidity and richness.

The third case is that in which the scale of gradation is ex-
tended in the high lights and coutpressed in tlie low tones. It ts
suitable for subjects whose chami is in their luminosity and the
delicate modulations of their lighter tones, for effects of sunlight
on light surfaces. It sacrifices the shadows, and, if these are
extended, makes them look empty. It corresponds to careful de-
velopment with comparatively short exposure.

In these three cases we have postulated the existence of gra-
dation sufficiently contrasted to give both black and white in the
prints. But actual white is found, as a rule, only in small i)atches
in nature — as the highest light on a sunlit cloud or white object —
while absolute black is practically non-existent.

Now, though the black of a print is not comparable with actual
blackness, i.e., absence of light — yet we know tliat it is ihe black-
est black we can obtain on a print. If we use such a black to
represent something in nature wliich is not absolutely black, the
print will appear forced and exaggerated.

In nature we (eel that there is always a reserve. Though the
dark shadow in nature may be much darker than the black on
our print, yet we know that in nature still deeper tones exist,
while in the print we have touched bottom. For this reason it is
safer not to use quite the full gradation of a printing paper, or
if we use it, be careful that white and black appear only in very
restricted areas, to form the extreme accents of the high light
and deep shade.

From the foregoing it will be seen that we do not always
utilize the full scale of gradation, but may vary the expression of
pictures by adopting a high tone in which we have full gradations
in the lighter portions of the picture and no darks, or a low tone
with full gradations in the shadows, but no lights.

I Obviously, in neither of these cases must development be
pushed so far as to get a very long scale of gradation. In the
first case the exposure must be comparatively short, in the second,
sufficiently prolonged to give the shadow tones.
Such a restricted scale is most appropriate when we wish to
give an effect of great luminosity or of gloom. Although such
treatment is cafable of giving a very good illusion of certaiii
aspects of nature, the results are more likely to appeal to the few
I

MOTION PICTURE PHOTOGRAPHY

than to the "man in the street," who prefers more full-blooded
presentments of nature.

The genera] design or composition of a picture, and its masses
and light and shade, are of paramount importance. Detail is
good if it helps to emphasize and increase the interest of the
general idea, but bad if it attracts attention from, or conflicts
with that idea.

For instance, if in a picture, the eye, following some attractive
line from the foreground, halts to consider the principal object
in the middle distance, and finds pleasing detail there, the sensa-
tion is one of added enjoyment. First the good design, then the
pleasant progression, then the interest of the main object, and
then the further interest of examining its details and finding fresh
beauties. This is a right use of detail.

When, on the other hand, detail, whether owing to too crude
h'ghting or to too sharp focusing, is sprinkled all over the picture,
and draws the eye now this way, now that, then it is detail in-
correctly used.

A picture may be sharp, or nearly sharp, all over, yet if the
details are subsidiary, and do not flaunt themselves, the effect
may be harmonious — witness many of the paintings of the pre-
Raphaelite school. On the other hand, a picture may have no
sharp place in it, as in the paintings of the French Impressionists,
and yet be harmonious.

There is no general law, only the rule that detail must be stib-
servient to the general idea of the picture. Detail may be con-
sidered as pictorial embroidery — rightly used it gives a rich effect,
wrongly used a garish one. Yet, as we may have a beautiful
drapery either with or without cmliroidery, so we may have a
beautiful picture with or without detail.

In a photograph we are more likely to have too much than too
little detail. Often it is a case of not seeing the wood for the
trees. If we focus sharply on our principal object, we shall get
other objects in the same plane sharp also.

It is one advantage of the older forms of lens that their curva-
ture of field, or their marginal astigmatism, partially eliminates
the detail round the edges of the picture, where it is most likely
to be superBuous.

The larger the stop used, the fewer planes are in focus at the
same time, and for this reason one should work with the largest

COMPOSITION BY J. C WARBURG

stop with which fair defiaitton is obtainable, focusing generally
on the principal object or on the foreground, for a blurred tree
or rock in front of the picture is objectionable, while a diffused
distance is generally pleasant. If we stop down too much, we
lose all effect of relief and distance, unless, indeed, nature has
been so kind as to intervene with an evening mist to soften the
distance for us. We are using too large an aperture, when the
drawing of objects is lost.

A certain amount of detail is probably necessary to convey
texture, but in landscape this is not always requisite. Less detail
is necessary to indicate the shape of objects. When form is lost
by extreme diffusion, we attract attention to parts of the picture
which it was our intention to keep subsidiary.

Depth of focus, or depth of dcfiniUon, the name given to the
power of a lens of defining equally sharply, planes at different
distances, is chiefly a matter of focal length and stop.

Using the same lens, the depth of focus is increased by stopping
down.

Of two lenses of different foci working at the same relative
(not actual) aperture, the shorter focus one has the greater depth
of definition.

A great softener of detail and harmonizer of tones is the
atmosphere, especially if burdened with moisture, not necessarily
in the ver>' distinct form of mist or fog.

We sometimes notice how hard and crude everything looks
in an east wind, how black the shadows are, yet how devoid of
that mysterious depth which is so attractive to the artist That
which is lacking is "atmosphere."

The effect of atmosphere — aerial perspective — is to inteqwse,
as it were, a light veil between object and spectator. Only near
objects are visible in their real tones or values, those further
away, are more and more veiled as they are at greater distances
from the eye. The effect of this is twofold. On the one hand.
it blurs and diffuses objects progressively, according to their
distance. On the other, it confounds their color or tone, by
shrouding and covering them with a veil of mist. Thus a black
and white object near at hand becomes but dark and light grey
when we recede from it, while from the distance it appears a
uniform grey tone.

It is one unpleasant effect of under-exposure and over-develop-

MOTION PICTURE PHOTOCRAPHY

mcnt tliat they tend to exaggerate the contrasts of distant objects
and make them come forward, "jump/' as it is called.

In order that the different tones of a picture should ap[>ear
to the eye at their right distances, their values must be correct,
that is to say, ihcy must be to some extent proportionate to one
another. The tones individually need not match the tones they
represent in nature, but they must bear a similar relationship.

Thus, we may represent a light tone in nature by a light tone
on developing paper, or by a medium lone, and both may give a
true eifect if all the other tones are shifted down in correct
relation.

It is not known whether this question of values can be ac-
curately proportioned or scientifically measured. ITie problem
has been attempted, but not solved. At present a trained eye is
the only judge.

It is tliercforc necessary to carefully educate onc*s taste by
observation. It is the only safeguard against those crudities of
tone which arc far too frequent, even on exhibition walls. Never-
theless, we arc progressing in that matter, faster perhaps than in
other directions.

The ordinary photographic film is color blind, and therein lies
one of the chief causes of false values. A blue object appears
too light, and a yellow object too dark when the negative is taken
on an ordinary plate. The ordinary film is little affected by
pure spectrum yellow light in the time required to impress the
blue rays; yet as alt objects in nature reflect mixed colors, includ-
ing a good deal of diffused white light, and not merely a single
spectrum color, this inscnsitiveness is less formidable than it
would otherwise be. Nevertheless, it is quite sufficient in many
cases to entirely falsify results. I have, for instance, taken a
field of blossoming gorse on an ordinary- film, and the result has
shown no indication of blossom. All photographers, too, know
the difficulty experienced in obtaining clouds on the same plate as
the landscape.

Orthochromatic or isochromatic films arc prepared with a dye,
which enables the film to absorb, and be affected, by rays of color
which the ordinary film fails to hold fast. There are two chief
classes of orthochromatic films — the one class sensitive to yellow
and green, the other sensitive to red as well.

The latter^ or panchromatic class, is rather difficult to work,

9flP

COMPOSITION BY J. C WARBURG

fogging easily, and liardly permitting development to be watched,
[ and therefore most suitably developed by time. The other class,
with ordinary care and by using a good red light and shielding
the tank during development, is nearly as easy to work as or-
dinary film. Yellow being to the eye the brightest color, it is
yellow sensitiveness which is important, and so red sensitiveness
is to some extent a luxury.

Whichever class of film is used, however, its blue sensitiveness
is slill excessive. In order to make full use of their ortho-
chromatic properties, it is necessary to damp the blue and violet
rays of the image with a yellow or orange screen. These have
already been discussed.

By a suitable screen, in conjunction with an orthchromalic
film, it is possible under favorable circumstances to obtain the
sky and landscape both well rendered on the same plate. When
a dark foreground is contrasted against a bright sky, it is, how-
ever, a difficult matter to expose so that both landscape and sky
arc satisfactorily rendered. It is well worth tr)*ing, thougli one
may have lo put up with frequent disappointments.

After selection, which settles the composition of the picture,
and focus, which decides its detail and to so^ie extent its em-
phasis, we arrive at the very important matter of exposure, which,
with suitable development, decides its lone and gradation. The
old idea was that you could give almost any exposure, and then
make up for its incorrect np«*s by suitable development.

The modem trend of opinion is almost the contrary. Once
the exposure has been made it is only possible to alter contrasts
by giving a short or a long development, or, what is much the
same, a weak or a strong one.

Modern authorities do not deny the value of bromide in over-
exposure if used from the beginning of developmpent ; but as
its use in quantity appears to be equivalent to slowing the film,
it is hardly suitable for unknown exposures which may have
erred on the short side.

Whether we believe in the possibility of modifying results or
not m development, however, we cannot help believing in the im-
portance of exposure. For this reason it is necessary to have
some guide which will enable us to estimate, or rather approxi-
mate to, a correct, or preferably a normal exposure.

Once we know what the normal exposure is, it is possible to

301

MOTION

PICTURE PHOTOGRAPHY

modify it in either direction to obtain special effects, as sug-
gested when discussing tone gradation ; but if we only guess at
the exposure, we arc working in the dark mentally — a far more
difficult task than working in actual darkness.

Given a normal exposure on an ordinary subject, we shall get
good gradation; the length of the scale and the amount of con-
trast depending on development.

With under-exposure we shall ge! either a partial scale with-
out contrast, or an abrupt scale with contrast, according as wc
develop little or much.

Normal exposure may be defined as the exposure, which, with
normal development, gives detail in the shadows without over-
exposing or blocking up the lights.

The principle on which exposure is calculated is simpld though
the estimation itself is not always easy. If we always took similar
objects in the same light, with a f«rticular film and stop, we could
always give the same exposure.

It is the variation of these four factors, stop, film, light and
object which modify exposure.

The basis of all methods of calculating exposure consists in
taking an exposure which has been |)roved to be correct as a
starting point, and multiplying or dividing it to compensate for
alteration of the four factors.

To take the simplest factor first. The stop lets through light
in quantity proportionate to its area ; and its area is proportion-
ate to its diameter squared. Thus a two-inch stop lets through
four (that is, two square) times as much light as a one-inch
stop, and therefore requires only one-quarter the exposure.
Simliarly f/iz requires four times the exposure of f/6.

With difTerent lenses, the equivalent, not the actual aperture*
is the measure of the light passed. Thus f/8 must be taken as
of equal rapidity with all lens.

The next factor is the film. Its speed must be found by
trial, under kno^'n conditions, or taken from one of the published
lists.

The most difficult factor is the light, and this must either be
TDeasured with an actinomctcr, or taken from tables giving its
strength under different weather conditions in t^fFercnt latitudes
and at different times of the day and year. If we use tables we
must have another factor for subject, for obviously the exposure
for an average landscape will be much shorter than for the in-

3(tt

coMPOStrroN by j. c. warburg

tcrior of an avenue. When the light is directly tested, this
subject factor may be eliminated for ordinary subjects. In the
shade of an avenue, for instance, the actinometer will darken
much more slowly than in the open.

The tabular method is exemplified in the Hurter and Drifneld
meter; in the Photographic Era exposure tablf ; and is elaborately
worked out in tbe Burroughs and Wellcome exposure record.
The actinomeler method has been perfected by Watkins and by
Wynne.

Theoretically the actual testing of the light is most correct.
In practice, all methods give very similar results.

Most films possess great latitude in exposure. If the normal
exposure be doubled or halved the difference would generally not
be great.

This latitude of a film is more severely taxed when the subject
includes great contrasts than when there is a short range of gra-
dation. Considerable latitude is necessary to correctly render a
bright cloud and a dark, detailed shadow at the same time. In
such cases, therefore, careful exposure becomes a necessity.
Careful development, too, is necessary, or the sky will be so
dense that it will not print out till the shadow detail of the land-
scape is buried. On tlie other hand, subjects of slight gradation
may receive exposures in the ratio of one, two, and four on
separate pieces of film, be developed for the same length of time
in the same tank, and yet give prints indistinguishable from one
another, though the negatives will be different in density.

It may be well to sum up shortly the different qualities on
which depend the artistic values of a picture.

From the point of view of natural effect, the most important
are tone and values; from the decorative standpoint — good de-
sign, including spacing, balance, line and mass; unity, the sub-
serviency of all parts of the picture to the general effect and idea
of the picture; and harmony, which pleases the eye by good light
and shade, with absence of clashing lines or harsh contrasts.

The artistic expression of the picture depends on all these,
its moods depend on key, on focus, on contrast, and on line. It
depends also on the photographer, on his seeing eye. on his
capacity for discovering and being impressed by the beauties of
Nature; finally, on his ability to record something of these beau-
ties and something of his emotion in receiving them, so that
those who behold his picture may see and feel with him.

303

Chapteh XIX
AIRPLANE PHOTOGRAPHY

THE trementlous increase of interest in aeronautics brought
alxmt by the war lias brought the importance of aerial
photography to a prominence which cannot be ignored
in a book on motion photography.

Already many of the large protlucing companies are maintain-
ing hanyars and fleets of airplanes for taking motion pictures
in ihc air. Darc-dcvil stunts on terra firma have been worked
with every conceivable variation and permuution until the 9f>cc>
tators have become blase and view with ennui^ feats that thrilled
them to the marrow a few short years ago. Consequently, pro-
ducers. e\-er alert for new 9ensation5. have turned with alacrity
to the possibilities of new hair-raising stunts performed tboo-
sands of feet in the an-.

In most of the stunts on the ground or cren <m the water* the
camononan often shares to a large extent the dangers uwolwtd
in the icats depicted* bat in only a fraction of a degree to what
he mtist share in taldn; stunts m the air.

In working on the gnKind with speeding trains, or other racnig
vehic/es he can easily reduce the ^leed ot the noving pafticipant»
and b>* reducing his cranking rate pfuduce the enect of htcak-
neck 9pecd, whereas the apparently wiklhr careemng inachiiiCA
are in reality pcoceedng at a leisut'cly pace^

la the air, however, ao sach htilBde ia ptiaillgil him~ His
facof aitpbne caoDOt redace its headtoag fiCht withma^ faB-
sog to the groaad aad has crank band aaBk acvcr falter or kise a
atrake even though he haag head downaard with tea thnMil
feet of kfaia air bctweca bbb aaa the (Boa gieui laita. Net
oely wm he keep LiiiiiJiHg hat he wmat also r""niaw wilh
Mhia^ speed to rctafla las sabject m the ficM of his caoera.
lae eoaatam skiftiaf otf the phaes ia Ae tHBtBhle air anfae it
■ipaanble to gvC the pattait aWMWit yvi^g a cnaftBrtwai^ caa^a
«ad «pad» Md hfatiac hM oat at his ova gHK.

The wock of a eMaetaaHa ia a ship is saabgeas to that oi

i^Pkoto ty U. S. Sninni Corttf

MADISOK SQrARE AND METROPOLITAN TOWER, NEW YORK CITY,
FROM THE AIR

AIRPLANE PHOTOGRAPHY

the aviator and the science of aviation lias g^iven us a new ver-
nacular which we may presently find blending its picturesquencas
with the idiom and patois of the picture game.

The writer, who happens to be the editor of this book as well,
feels, with coasiderable egotism perhaps, tliat he can write with
some authority on the subject, as he made for the Department
of Military Aeronautics, while in the Array, several thousand
feet of motion picture film while in the air In addition he made
sundry flights at other times for other purposes including as-
censions in balloons, both free and captive; dirigibles, observation
and kite balloons, airplanes of many types and flying boats.

In all of his experience of more than twenty years of photog-
raphy in many lands and difFcrcnt climes, he found nothing —
not even three months' exploration of coral reefs on a tropical
sea bottom in a glass-sided diving bell — which can begin to com-
pare with the pleasurable excitement of aerial photography.

Taking a flight as a passenger securely strapped in the scat in
the observer's cockpit and protected from the rushing air by the
sides of the fuselage is like riding in a limousine, compared to
standing behind a camera with half the body exposed to the
ripping, tearing, raging hurricane from the profxUcr, whipping
past in a hundred-and-twenty-five mile gale with the roar of
the exhaust battering the ears till your loudest shout becomes
but the shadow of a whisper to your own cars.

If you have no gosport or speaking tube to communicate with
your pilot, it is necessary to arrange a system of signals before
ascending so that you can direct him as to what to do.

Much of tlie success of your pictures depends upon your pilot's
having a good camera sense. Fortunately most good pilots have
an inherent sense of distance and after being shown just what
angle the camera covers, will be able to keep the camera ship
in the most advantageous position and at the correct distance.

In a machine where the cameramen can be stationed in the
observer's cockpit forward of the propellers, the work is a cinch
compared to the more common two-seated tractor where th«
photographer must take the rear seat and the full blast of the
propeller. In a ship or a flying boat with a forward cockpit the
camera can be trained easily in almost any position and close-ups
may be taken of the operation of the ship itself.

With the tractor type in which the cameraman must work in

80ft

MOTION

PICTURE PHOTOGRAPHY

the rear cockpit, it is generally inipracticable to shoot forward
at all, the range of view being limited to the sides and over the
tail. I liave worked in ships that were in such bad repair that
they threw a constant spray of oil and water from the engine
and radiator back onto me and the camera. Turning the lens
toward this was, of course, out of the question. |

On the other hand, I have been in some ships which were so
clean that the camera could be turned directly toward the propel-
ler and operated for minutes at a time without fogging the lens.
The revolutions of the propeller arc so swift that it is seldom
that they interfere with the picture unless the sun strikes the
blades at an angle which throws reflections into the lens. So
do not hesitate to shoot through the propeller blades if neces-
sary. Naturally in shooting in any direction except at right
angles to the fuselage of the ship in a rear seater, portions of
the plane will show in whatever view is being made. Generally
this adds to rather than detracts from the picture. However, as
dramatic pictures come to be taken more and more from camera
ships such obtruding parts will become imwelcome as detracting
from the main action of the picture and more care must be
exercised to see that these extraneous parts do not intrude in
the field of view.

The pilot has almost as much to do as the cameraman in ob-
taining stunt pictures, that is, close-up views of other ships
flying near the camera ship. Besides keeping at a proper angle
and distance, there is the problem of flying the ship smoothly
so that the taken view will not meander all over the screen.
Some pilots have such a delicate sense of balance and orientation
that they can dip and bank and put the ship into alnwst any posi-
tion without a jar or quaver, while others make it difficult to
slay with llie camera, to say nothing of being able to crank it.

An expert can wing a ship over into an almost vertical bank
and turn at just the right curve so that the gravitational and
centrifugal forces Just neutralize each other, and though the
cameraman may be standing with his body almost horizontal and
be shooting straight down vertically over the side, yet in rela-
tion to the plane, he is standing straight up and not touching the
side of the cockpit Instead of fearing that you are about to
drop out of the plane, the sensation is not that you have turned
half-way over, but that the earth has suddenly gone crazy and

ao6

tilted itself up on edge and that the only way that you could drop
out would be to fail through the bottom o£ the plane which
seems still to be in the direction of down. In a like manner in
looping the loop, when it is done at just the n^hi speed, the
earth tilts up at the tail of the machine, rises up, sails over your
bead, drops down in front of the propeller and then resumes its
customary place beneath you.

Don't go lip if you are not feeling well. Even a good aviator
will not do that. I did it once and it made me very sick. I
do not feel ashamed to tell it for half the pilots on the field would
not go up that day. It was at one of the Texas flying fields
where the officers' mess was fortunate in having a particularly
good cook and the evening before, fried liver and bacon had
been the piece de resistance at the eating club and although it
certainly tasted good, all who partook of it had a strong touch
of ptomaine poisoning. I was one of those who had eaten
Iieartily of it and had passed a bad night in consequence. Still,
a special aerial combat had been arranged for me to record and
I did not feel that I could refuse after elaborate preparations had
been made to engage the best pursuit jMlots for a mock battle
in the clouds.

My own ship was manned by a fine stunt pilot and his instruc-
tions were to fly just above the combat planes who were to
play hide-and-seek in the clouds below. Well, I'll say we did a
few stunts ourselves trying to keep tliose two pursuit artists
within camera range and get their swoops and feints and starts
and dashes at each other. They did everything in the aviation
decalogue and a few more that haven't any names with my pilot
trying to step on their tail and me humping to keep them in the
cajnera.

Well, I got four hundred feel, all there was in my magazine
and signaled the pilot to go down. He turned around at my
touch on his sliouldcr and he must have seen my pea-green com-
plexion for he didn't lose any lime getting down into the field
which was fortunate for I had a severe attack of sea-sickness.
The pilot, who had also partaken at mess the evening before, was
very' polite and was similarly affected. He was in fact apologetic
and said something about a weak stomach so that T couldn't help
rejoining that he had a pretty good one ; he seemed to be shooting
about as far as I was.

1107

MOTION

PICTURE PHOTOGRAPHY

The main secret of taking good pictures from an airplane is
in having the camera securely fastened to tlie ship so that the
vibration cannot loosen it. When a machine-gun ship can be
used, the machine gun scarp makes an ideal mount. W^h the
machine gun removed, the average tripod head with the legs
removed can be fastened to the mount with a single bolt four
or five inches long and ^ inch in diameter with a sixteen thread.
A ^-i6 bolt fits the regulation tripod socket. With the scarp
mount the camera can be trained instantly in any direction and
does not take up nmch room in the cockpit and the swivel scat
and gunner's belt will also prove useful.

Wliere a machine-gun scarj) is not to be had, a mounting de-
vice can be made easily in almost any ordinary repair shop. This
consists of 6 in. or 8 in. boards just long enougli to fit under andf
over the upper longerons across the cockpit. Two holes are
bored near each end of the boards and one in the centre, the
boards being placed in alignment and bored at the same lime.
Four bolts through the end holes will clamp them firmly to the
longerons which are the two upper main members of the fuselage
frame running lengthwise of it. If it were not for the rounded
cowl on top of the fuselage, the tripod head could now be bolted
directly to the clamp through the centre hole in the boards.
The cowl, however, interferes with the manipulation of the
camera and renders it necessary to place enough blocks under
it to raise it above the cowl. These blocks should be six or eight
inches square with a hole through the centre of each. A king
bolt must now be made of ^-inch rod, long enough to pass
through the clamp boards and the blocks and screw into the
tripod socket. I-arge washers should be placed on the bolt heads
and under the nuts so that everything can be tightened up firmly
without drawing the bolt heads into the wood. Thread the king
bolt for a good distance at each end for the block and boards
will stand considerable compression before they are perfectly
firm.

Now see that everything about the camera is in perfect shape
and securely fastened. The turning handle and the tripod
handles must be fastened on their spindles or the vibration will
shake them off and cause you to lose them.

A light yellow ray filter should be used. This you can well
afford to do because in airplane photography you have the ad-

30ft

AIRPLANE PHOTOGRAPHY

vantage of all the light that there is. Even with the Eastman
filters Ki or Kj pictures can be taken at f 8 and f 1 1.

Set the lens at infinity unless you have fairly close up pictures
of other planes, in which case, set it at thirty feet wliich, at the
aperture you are using will render everything beyond 6 or 8
feet perfectly sharp.

Use the shutter wide open. It has been advocated that a
narrow shutter opening should be used so that the sharp defini-
tion of a quick exposure would neutralize the effect of vibration.
This is a fallacy. If vibration is severe enough to spoil single
pictures, it will spoil a series also. Even though each individual
frame may be sharp the succession of sharp pictures out of
register with one another will be blurred on tlie screen and show
a greater effect of vibration than when made with an open
shutter and small stop.

In cases where it is not possible to make a special camera
mount for a ship, the tripod can be lashed in the cockpit with
strong twine and straps but this should be done only when no
mount can be obtained. The legs are bulky and take up useful
space in the cockpit and it is almost impossible to fasten the
tripod so that the panoramic head will be level with the plane.

See that your flying clothes and goggles arc fastened securely
but comfortably. Losing your goggles will mean loss of sight
for as long as you arc up you will not be able to open your eyes
in the terrific blast from the propeller. Fasten your clothes.
tightly or the air will balloon them and they will interfere with
camera operation.

309

Chapter XX

HOW SUBMARINE MOVIES ARE TAKEN

Written by Lu Senerens

Captain Charles Williamson, of Norfolk Va., perfected an
invention several years ago designed to explore the bottom
of the sea. The apparatus consists of a barge, a flexible
tube of metallic construction, and a submergible terminal opcrat*
ing cliambcr, containing a steel cone projecting outward, the end
of which is made of glass. By descending the tube into the
sphere and photographing througli the glass, pictures of sub-
marine life can be secured.

The inventor's sons, J. Ernest Williamson and George M.
Williamson, helped their father in the develoiwient of the appa-
ratus. They began experimenting with ordinary cameras, and
secured some excellent snapshots of fish at tlie bottom of Hamp-
ton Roads. This experimenting led them to the belief that Moving
Pictures of submarine life could be taken, and they formed a cor-
poration of Norfolk business men.

An expedition was then planned to take the apparatus to the
West Indies. The photography was in the liands of Carl L,j
Gregory. Tlie famous marine gardens of the Bahama Islands;^
near San Salvadore, were selected as tlie best location for the first
under-the-sca studio. This location was chosen because of the
remarkable cJearness of the water and the variety and beauty of
animal and vegetable life. A vessel suitable for operating the
apparatus was constructed in the shipyard at Nassau, in the
Bahama Islands. The marine gardens nearby were selected as
the place for taking Ihe fiirst pictures. This location is more
beautiful than any other in this part of the World. The sea bot-
tom is strewn with wrecks along the treacherous coral reefs, and
the denizens attain the most gorgeous colors and most fantastic
forms.

Here Mr. Gregory secured a panorama of the sea bottom bji
the perfect illumination afforded by the sunlight coming down^
through the water and striking the white coral reefs. It required
ten days of experimenting and considerable waste of film to ascer-

310

IC fntlrty i-t '•'••' SulimitriH^ ^■^l'^^ C i>r/'>Jrdltt>«l

DIAGRAMATir VIKW SHOWINC THE MANNER IN WHICH UNDERSEA

MOVIES ARE MAUK BY THK LSK OK THE WtLLlAMSOV DU'EKC TUBE

AXD SrBMARlNK I'HOTOC.RAIMIIC CHAMRER

HOW SUBMARINE MOVIES ARE TAKEN

tain the correct exposure necessary lor submarine photography.
Some of the pictures were made at night with the aid of sub-
marine lamps equipped with 2,400 candle-power Cooper-Hewitt
quartz burners. The exposure for day and night pictures was
about the same, the average being from one-thirty-second to one-
scventy-fifth of a second at depths varying from 15 to 60 feet.

Scientific photographers in America had previously declared
that no practical photographs, much less motion pictures, could
be obtained under water, but tlie result of the expedition of sev-
eral months* duration was alx)ut 30,000 feet of moving-picture
film. These pictures were later produced and copyrighted by the
Submarine Film Corporation.

Mr. Hadden-Smith, the colonial governor of the island, was
much impressed by the importance of the work. Both he and his
wife descended into the observation chamber, and were amazed
by the beauty of the spectacle revealed.

A scries of scenes native to the Bahamas were fixed upon and
photographed. For example, all tourists in tropica! waters have
seen negro boys dive for coins thrown into the water. Perhaps
one of the most intensely interesting scenes in the film is the one
showing these negroes beneath the surface fighting each other for
the descending pieces of silver. As many as three at a time were
caught by the camera struggling to secure the money at a depth
of about 25 feet from the surface.

Not far from Nassau lies the bulk of an old blockade-runner,
wrecked while seeking safety in that harbor at the time of the
{'ivi! War. She sank to a depth of 50 feet, and her location was
well known. As the expedition required a scene showing a diver
under water, George Williamson voluntcerd to enact the role
and a diving suit was borrowed from the colonial government.
Mr. Williamson had never been beneath the surface in siich an
apparatus before, yet unhesitatingly donned the suit, made the
descent near the wreck of the blockade- runner and strolled about
picking up cannon-balls. These were sent to the surface in a wire
basket at the end of a rope. His movements were photographed
by Mr. Gregory from inside the spherical cliamber.

Numerous exposures were made of the great variety of fish fre-
quenting those waters. A number were snapped swimming about
their natural haunts among the coral reefs. Some were drawn

all

MOTION

PICTURE

PHOTOGRA PRY

near the aperture of the photographic chamber by means of a
bailed line. In majiy cases color plates were taken of the finny
beauties as a guide for coloring the fihu by hanil, so that the public
might see the creatures in their tints.

Man-eating sharks are indigenous to the waters of the Bahama
Islands, and a film that has no counterpart in the annals of pho-
tography was made of a battle royal between two of these levia-
thans. Some of the monsters are from 18 to 20 feet in lengtlu In
ordor 10 secure this film the carcass of a dead horse was towed
out to sea and anchored in the water near the Williamson appa-
ratus. It was then cut with a knite in order that its blood miglu
attract sharks to the spot. Within an hour there were fully
twenty-five of the monsters nibbling at the bait. An effort was
made by the crew of the barge to catch some of the sharks with
hooks, to which heavy woven wire was attached, but they snapped
the wire with their teeth, and it then became necessary to use
chains. One of the largest of the sharks was drawn close to the
obser\'ation chamber in order to secure a photograph of his strug-
gles. He retained a large piece of meat in his mouth, which
attracted another shark, who came up to wrest it from his jaws.
The second shark, angry at its inabihty to get more food, dashed
away into the abscurity like an enraged lion, but returned and
with open jaws darted like a bull at tlie one held fast by the hook.
The photograph shows his snatching at his companion's huge fin,
and he is seen tearing it to shreds with his serrated teeth. The
captured shark in turn became furious, and began swimming
around wildly in an eflfort to get at the other.

Alarmed for the safety of the photographer should one of these
raging monsters burst in the glass, the man on deck slackened the
line, and the sharks began to sink below the observation chamber.
They were plunging toward each other with wide-open mouths,
tearing at each other's body until they were reduced to shreds and
a mass of streaming blood. Despite the fact that one of the fish
was handicapped by hook and chain, it beat off the other and won
the battle. It was later drawn to the surface and killed.

The most daring feat ever attempted by a moving picture actor
was one undertaken by Mr. J. Ernest Williamson. Stripped to
the waist, a knife between his teeth, he dove into the ocean where
a dozen man-eaters were making the water fairly boil in their mad

313

iPhcto by J. F. H'i-l:3m.:o'i-

KISH AND SF.AWEF.n IN NORFOLK HARBOR. THE FIRST
SUBMARINE PHOTOGRAPH EVER TAKKN.

HOW SUBMARINE MOVIES ARE TAKEN

[rushes for another victim. Descending twenty feet, Mr. William-
Ifton met an ocean monster and fought his battle of life and death.
(The photographer, watching the encounter witlr terror, kept turn-
ling the crank and recorded every movement of the desperate
[combat. Mr. Williamson had taken his Hfe in his hands to fight
[a shark in order that the scene might be recorded on the moving-
I picture fihn. As he went under the water he observed an enor-
fmous shark darting toward him and permitted his body to sink
I under it. TTie shark shot past over his head and turned just as
I Mr. Williamson ascended. They were now face to face. Tlte
strain of holding his breath nearly thirty seconds was becoming
unendurable. He knew that he must kill the shark or the shark
•would kill him, and it had to be done before his breath gave out.
' With a quick movement, he swung slightly to one side, just
, escaping the shark's head, and grasped one of its fins with his
left hand. Taking the knife from between his teeth, he thrust it
into a vital part of the shark's body again and again. Had the
[combat been prolonged five or ten seconds, as it threatened to be,
[he would never have come to the surface alive. The cameraman
would have seen him torn to pieces by the other monsters that
I came gliding around in a circle outside the range of the lens,
, watching the finish of the fight.

Perhaps his feat was foolhardy, but hardly more so than OrviIIe
'Wright's first flight in his biplane. Mr. Williamson was simply
1 doing something that no other man had ever done. Once he
[ learned that he could take photographs at the bottom of the ocean,
• it was up to him to stage at least one picture that would be memo-
I table in moving picture history.

Many other intensely interesting photographs were taken,
showing the flora and fauna of the ocean bed. and not the least
interesting of the latter is a fish with a tihrtle-likc neck and head,
which is a species entirely imknown to the savants of piscatorial
records.

Upon the return of the expedition to America, it was decided
that the first exposition of the film would be made before an
audience of scientists, diplomats and men and women prominent
in Washington society. The films were developed and found to
be excellent. They were then exhibited in the Smithsonian Insti-
tute. Dr. Baul Bartsch, of the institute, mounted the platform

313

iL onrtr^y Su&»iiirinc r-ii'i \. rirfeyratu'n -i iiolcfirnfiii'ii h\ {.art I.. Cfefifiryt

Vvrn M work on thr trm^in* of i Civil War Blockade Runner.
Coial reef and fiili in the backfrotind.

Chapter XXI

MAKING UP FOR MOTION PICTURES

THERE is a great deal too much make-up used in motion
picture studios. The primal idea of make-up should be
the same as that of the retouching done by a good photog-
rapher in making a portrait, i.e. the removal of superficial
blemishes. Retouching the multiplicity of small pictures in a
motion picture negative is practically impossible and the actor is
supposed to arrive at the same result by the more direct method
of retouching his face. Since the average actor is used to mak-
ing-up for the glare of the footlights and to bear inspection only
at comparatively great distances, he is apt to forget that in
motion pictures the major part of his work is done in the much
stronger and differently colored light of day or in the glare of a
multitude of arcs and Cooper-Hewitt's with the relentless eye
of the camera only ten or fifteen feet away and often much closer.

Up-to-date directors arc insisting more and more that make-up
shall be natural and not artificial. Some of the studios even put
their extra people on the salary list the day they leave off shaving
when they re(|uire people for "rough-neck" parts. It requires
an artist skilled in making-up to put on a crcpe-hair mustache or
beard that is not palpably false. The director who uses an actor
with a bad make-up is only deceiving himself and not the public.

TJelow I am giving an abstract of a set of genera! rules for
make-up which was made for a well-known studio a short time
ago. and a copy of it should be pasted in the top of every motion
picture actor's make-up box :

People doubtful of their make-up should submit the same to
their photographer for inspection before appearing before the
camera.

tAs a rule too much make-up is used for natural effect
For ordinary make-up use Stein's No. 2 grease paint over cold
cream with enough ficsh or bninettc powder to avoid shine or
varnished effect of grease and cold cream.
Unless of extraordinary dark or light complexion or in case
of skin defects such as pimples, moles, pits, freckles, or fine

8tt

MOTION

PICTURE PHOTOGRAPHS

wrinkles, grease paint should not be used — a light application of
cold cream with a slight a^iplication of powder gives the best re-
sults before the camera.

Application of grease paint: Remember that the camera records
the back and profile as well as the full face and extend the make-
up to the hair at the top, to below the clothing at the neck and
behind tiic ears at the back.

Make-up of the eyes: As a rule it is not necessary to bead the
eyelashes. It should practically never be done although it is
sometimes advisable for persons with liglit lashes to darken them
with black cosmelique. If you possess heavy black lashes it is
not necessary to line the eyes. Others should line the eyes with
a very narrow black line placed as near the lashes as possible.
People with prominent eyes and plump persons should shade the
orbits of the eyes very slightly with black or brown — generally
thin persons and those with sunken eyes do not need to use
shading. Unless eyebrows are very heavy and well defined it is
generally advisable to touch them up with the eyebrow pencil.

The lips: Be very sparing in the use of lip rouge. Remember
that red photographs black and that a heavy application of rouge
shows an unnaturally black mouth on the screen. Except in very
rare cases do not attempt to alter the shape of the lips by the
application of lip rouge. It almost invariably shows. Apply
the faintest trace, if any, rouge to the cheeks.

Lining; Lining should not be resorted to except in cases where
the character of the part absolutely requires it. Lines should
be made with dark red or brown and very carefully blended.
Directors should take pains to select their characters according to
type whenever possible and not require people to make-up out of
their type unless in cases of increasing age, or effects of disease*
dc, called for by the scenario.

Wigs: Wigs with wig bands coming across the forehead should
never be used if it is possible to avoid it. When this is necessary
take great pains to blend the band to the forehead to render the
junction of band and flesh as nearly invisible as jwssible.

Mustaches and beards: The technique of a good beard and
mustache would require more space than can be devoted to it
here. Do not use curly crepe-hair until you have straightened it
by dampening and wrapping around a hot pipe or by some similar
method. Comb out the straightened hair and build up the beard

JAMES J. CORBETT PREPARING FOR THE DAY'S WORK.

MAKING UP FOR MOTION PICTURES

or mustache on the face a small lock at a time with the aid of
good spirit gum, then trim carefully. If you do not know how
to put a beard on properly get assistance from some one who docs.
Do not fail to use hair colored to liarmonize witli your own or the
wig you are wearing.

Colors : Light blue photographs white and should never be used
in motion picture make-up.

Yellow, orange, red and their combinations all photograph dark.
Red and black are exactly the same to the camera.

Yellow blonde hair photographs dark, ash blonde photographs
light — the more loosely the hair is arranged the lighter it photo-
graphs, and difTcrcnt methods of studio lighting also affect the
photographic values of hair.

Actors will frequently startle one by coming onto the stage
to work in a new and wonderful ( ?) make-up that someone told
them to try.

Never let actors or actresses change their method of make-up
during a picture that has been started. They must, absolutely
wait until the next picture to make any change in their style of
making-up. One actress had a habit of appearing one day with
her eyes encircled with a lovely emerald green shade and then
the next day deciding to try sl^'-blue instead. She caused con-
siderable trouble before she was convinced of her error.

Another myth that numerous actors entertain is the yellow
grease-paint theory. Nobody can explain why a performer
should make-up in Chinese yellow. There is absolutely no photo-
graphic theorj- to account for it or its use. Let the actor make-up
with grease-paint if he has a rough skin but let it be flesh-colored
paint, not yellow. The objections to yellow are that it is non-
actiaic and if the actor happens to step out of the rays of the
arcs for a moment or if he is shaded from the direct force of the
light by another actor his face photographs BLACK instantly.

Yellow may be used under heav>' or double chins to cause them
to appear to recede or be less pronounced, or red may be used for
this purpose. Yellow and red are also useful in causing eyes to
appear more deep-set than they really are. For the actor who
has so called "pop" eyes a shading of red around the eyes will
often overcome the defect, but it must not be used as a regular
shade to cover the face.

On the other hand do not allow actors to come before the

337

MOTION PICTURE PHOTOGRAPHY

camera snow-white or powdered with too light a powder. Some
actresses think that the lighter they can make themselves the
more youthful they appear whereas they only succeed in making
themst^lves look like billiard balls. A good natural flesh tint with
a powdering over of flesh tinted powder to kill the gloss of grease
paint cannot be improved upon. This powdering should be re-
newed at intervals, especially if the weather is warm and perspira-
tion causes the powder to disappear.

Hands should be given the same care in make-up that is ac-
corded the face. Too often hands are neglected.

Wigs must be carefully adjusted and a wig that would pass
on the speaking stage may not be nearly perfect enough to de-
ceive the camera.

When assigned a part, many actors allow their beards, mus-
taches or hair to grow to fit the part. This, of course, requires
notice some time in advance but is often done.

In designing sets or interiors for the studio, the cameraman's
opinion is frequently asked. It is a good rule to try to keep the
background tones several shades darker than the face of the actor
for the sake of contrast. If the walls were very light the faces
would appear darker than natural or sink into the backgromid
giving a flat lifeless picture.

Wall paper is frequently deceptive. A design with a heavy
lavender flower may look fairly dark btU will photograph almost
pure white. This applies to anything with much blue or violet
in it. Red and yellow will photograph somewhat darker than
they appear to the eye, but are not so deceptive as the blue tones
because of the orthochromatic qualities of the film.

Sets should be built two-sided whenever possible to allow the
cameraman to set lamps along the open sides. If the director
needs a three-sided set, places such as archways, doors, or win-
dows should be designed through which light may be thrown.
Never let the designer or stage manager tell you that you can get
your light from overhead. This will not produce a good result
excepting possibly in the case of prison-cells, artists* studio sets,
or caverns, and such effects.

Woodwork must be dull finished. A high polish looks well
to the eye but will reflect every lamp in the place and give a
thousand high lights to confuse the eye and detract from the
acting. If the stage painter says he cannot produce a dull luster

31B

Chapter XXII

RELATIONSHIP OF THE CAMERAMAN TO
OTHER WORKERS

MANY times directors or scenario writers ask for absolutely
impossible effects. The director expects the cameraman
to know his business. He does not wish to argue with
hini whether or not a thing can be done. He states what he
wants and says. "Can we do it?" H the cameraman is not sure
let htm reply. "Let me think it over an hour and I will tell you."
Invariably this is satisfactory to a director but at the end of the
stated time, the cameraman must say "Yes," or "No." There
must be no "Maybe" or "Well, let's try it." The director wants
to know whether it is a sure tiling and whether it will justify his
spending perhaps thousands of the company's dollars on an effect.
He will not excuse any failure if the cameraman cays the thing
can be done. On the other hand, the cameraman can, if he
considers the effect imi>ossible, say so and usually the matter will
be dropped and another idea substituted.

The director should never attempt to hurry a cameraman in
focusing or getting his camera set up. If he does, it is the
cameraman's dutj- to remonstrate and the quicker a director is
told and impressed with the fact that the cameraman is not
going to "shoot" until he is ready, the sooner peace and friend-
ship will reign.

On the other hand the cameraman should not waste time or be
outdoors smoking a cigarette while the director is rehearsing a
scene and then, when called, come in and want to know what it
is all about. The cameraman's place is back of his camera from
the time the morning's work begins until lunch time and the
same in the afternoon. That is why he draws a good salary. If
he leaves the stage or location for any purpose let him first tell
the director and state the length of time he will be away.

With the electrician — Oh — I beg you — make friends with
the electrician. He is your best friend or your worst enemy.
Bring him a cigar or a pack of cigarettes several limes a week

3S0

RELATIONSHIP OF TITE CAMERAMAN TO OTHER WORKERS

if this will help your standing with him. If he likes you he will
push the good lights into your set and see that your carbons are
nicely trinuncd. He, also, wit! get to know your methods of
working and can push a heavy bank of lights Just where you want
it without your even telling him.

If he has it "in for you" you can holler for lights an hour and
he will remain peacefully out of sight behind some barricade or
other and you can rave all you please. Or fuses will mysteriously
"blow" in the middle of a scene or the lights will all be working
in somebody else's set — "leastwise — ^all the good ones" and you
will, generally, feel that the world is a tougli place in which to
hve, And the happy part of it all is that these knights of the
"juice" are usually happy-go-lucky, easy-to-gct-along-with fellows
who arc easy to cultivate. Once your friends they will remain
so and do an>thing for you. Just treat them like human beings
and exhibit some good nature. They will appreciate it.

The same applies in a lesser degree to "props," the man who
takes care of the furniture and accessories used in the sets — but
his particular associate in art is the director. Still, he is very
useful to the cameraman when a platform is needed or a mirror
is wanted to throw a reflection into some dark comer.

The stage-carpenters arc usually quiet men who go about their
business slowly and methodically. They are paid by the day.
The cameraman will have very little to do with ihcni but should
be gracious and polite in any dealings he may have with them.
They arc under the direction of the stage-manager. H anything
does not suit you in the construction of the set, you should talk
to the stage-inanager and he will direct his carpenters accordingly.

And now the STARS. Who. oh who, can tell anything about
stars? Their temperament, their whims, their eccentricities!
The best way for the cameraman to conduct himself is to let
those personages understand, at the very start, that he is as im-
portant Co the picture as they. The opportunity to do this may
not come at once but, feel assured, it will arrive. Anything said
must be in a gentle voice without trace of anger but just as firm
as you can make it.

Stars frequently are "peevish." They will come in about ten
or eleven some morning with a headache — growl at everybody —
and want to hurry through the day's work and get away. The
more they are humored the more overbearing they become. So

321

long as no remarks are made direct to the cameraman on such
a day he had best keep his peace as the atmosphere in the studio
is usually heavily charged on that day. But any suggestion to
him that — "He get a move on," or "Step on the gas," must be
retorted to mildly by "Leave that part to me," or "Wc will do
the work carefully and right, or not at all." A few remarks
like this are all that is necessary to show the cameraman has a
"backbone."

If the star comes along with a nickname for the cameraman
it is very probably meant as a sign of his or her liking for him.
However, if the nickname appears to be the result of spite or z
dislike the cameraman should think up a suitable nickname for
the star and apply it vigorously. A certain cameraman did not
agree with his star on certain points of make-up and the star
began by calling him by the name of "useless." It apparently-
riled the cameraman and he always replied to the hated epithet ■
by referring to the star as "Old fathead." A few appUcations
of this resulted in neither of the names ever being used again.
Its funny but true, studios are peculiar workshops.

The cameraman will, if he is cheerful, usually get along al-J
right with the most temperamental star. Let him just laugh or
smile a little and attend to his business with a good word for
everybody and never a knock for anyone. Let him object strenu-.
ously when things don't suit him or his camera, but do so in a i
quiet and gentlemanly manner and he will have no trouble.

"Extra" people arc actors and actresses who are engaged to
appear in only a few scenes. They are not on the studio pay-
roll but are engaged by the day or half-day to appear in a scene
calling for a crowd. This may be a mob scene, a dance, a
cabaret, a camp of soldiers, etc. They arc sometimes called
"supers." It will be well, when a crowd of "extras" is about
for the cameraman to keep a close watch on his equipment. Film !
Iwxes should always be locked and the lenses kept under lock
and key also. I have even seen the lens on the still-camera stolen
on a day when about five hundred "extras" were being used. On
the same day they got away with several large silver platters,
about six dozen knives and forks, and a number of costumes.
Many professional pickpockets and petty-thieves mingle with
these "extra" crowds just for what they term "the pickings."
Therefore, keep ev«rything not absolutely needed, in your dark

RELATIONSHIP OF THE CAMER.\MAN TO OTHER WORKERS

nx)m and keep it locked securely when "extras" are about. Care-
fully watch everything you must have on the stage.

There will also be found in every crowd of "extras" girls
and women who will frequently try to ingratiate themselves with
the cameraman or whoever will not repel tlicir advances. It is
best for the cameraman, as a matter of ethics, not to mingle with
extra-people any more than is absolutely necessary. Some there
are among them who are struggling to work their way into the
studio, but the majority have other objects or no object at all,
except to get a few dollars and a square meal. (The studio
usually furnishes them with a free noon-<lay meal.)

With the manager — be businesslike. If he calls you into
his office on any matter of complaint — state your side of the
case quickly and pointedly. That is what he expects. Do not
show any inferiority of manner or fear of anyone. The manager
is usually the easiest and most considerate person about the
studio with whom to get along. He is also a very busy man
and the cameraman does not, as a rule, sec much of him.

Your conduct to your fellow-workers is just as important to
your advancement in your profession as a thorough mastery of
your handicraft.

Do you ever assume a detached attitude of mind and ask your-
self why you arc not earning as large a salary as some other man
whom you feel is not nearly as well equipped in professional
knowledge as you? Do you feel that you have some handicap
that you cannot define and yet which you know impedes your
progress to a better position and a better standing with your
fellows ?

Have you had the bitter sensation of having some one whom
you felt below you in the scale of experience, step ahead of you
into a position that you felt should have been yours ?

Most of us have, and most of us have accused our employers
of unfairness, or our rivals with duplicity or made any old ex-
cuse that salvc<I our conscience and permitted us to place the
blame anywhere but where it belonged, that is, on our own
shoulders.

Let it be granted that many times there have been unfair pro-
motions and raises in salary for the other man. but before we
begin any bitter recriminations and hasty bewailings of the bone-
hcadedness and unfairness of employers, let us go to open session

323

MOTION PICTURE PHOTOGRAPHY

with our own conduct and try to ferret out the attitude and I
frame of mind of the employer and of our rival.

We are all prone to view the world loo much from a selfish]
viewpoint and to accord too little respect and consideration to the]
viewpoint of others. We like to magnify our little troubles and]
tribulations and, no doubt, they are supremely important to us. '
Does that justify our thrusting their burden upon others and
not taking into account the complications which vex them pcr-j
haps more than we are vexed ?

Very, very few employers want to discharge an employee or to ]
reduce his salary if he is giving satisfactory return for the s-um
he receives. If you arc discharged, demoted or lose your place
in line for promotion, the chances are ten to one that the fault
is yours and not your employer's or your rival's. When the
reason is a financial or business one, the employer is, as a rule,
ready to explain the situation to the employee. Naturally in
such a case no odium is attached to a let-out for reasons over
which an employer has no control.

On the other, a discharged eirrployec is often told that he
is being let out on account of a reduction in the working force,
because of some deficiency which is inherent to the employee, and
yet which the employer has not the heart or courage to reveal
to him. One cannot imagine a more embarrassing situation than
that of telling an employee that he is incompetent, or undepend-
ab'c, or dishonest, or careless, or whatever the case may be.

It is true that there is hardly any other profession in which
there is more professional jealousy and distrust than in cinema-
tography. Many enforced hours of waiting occasioned by too few
studio managers and directors and by the lack of schedule which
prevails in most studios, seem to breed an incessant turmoil of
gossip or recrimination or malicious scandal, causing enmities,
ill-feeling, partisanships. Let us all broaden our radius and put
a bridle on idle and malicious gossip. Every unkind or thought-
less word we utter, wounds and rankles and breeds others which,
like boomerangs, scarify our own reputations. Our environment
is a mirror which reflects our acts and thoughts.

A man's earnings are limited only by his own limitations. Arc
you working to broaden your scope or are you whining that
others hold you back?

Cinematography is a profession that far out-classes portrait

324

RELATIONSHIP OF THE CAMERAMAN TO OTHER WORKERS

photography in the exacting knowledge and artistic training re-
quired for its pursuit. Yet where are the Pirie MacDonalds,
the Arnold Genthes, Bangs, Kasebiers, Johnstones, Hoyts,
Saronys, Du Ponts» Marceaus, Rcutlingers, Curtises, Bradys.
Hartmans, Gillies and hundreds of other names that grace the roll
of honor in portrait and pictorial photography?

An art is the sum of individual exponents. Are you adding to
or detracting from the dignity of the art of cinematography?
Be even more specific in your self-examination. Aside from
your technical qualifications, are you a man whose conduct is
entitled to respect and consideration?

Personality is a factor, a vital part of your profession. It
cannot be detached from it. Do you co-operate intelligently
with your director? Do you work for your salary alone? Do
you study the scenario carefully? Do you try to comprehend the
director's ideas and endeavor to assist him with tactful sug-
gestions? Or, do you scorn reading the scenario and distract
the busy director by asking inane questions?

Does your conduct command respect or derision? Are your
opinions deferred tn or are they ridiaded? Are you liked by
everyone above and below your station? All of these relations
depend absolutely upon your conduct. If nature has not en-
dowed you as bountifully with pleasant attributes as some of
your brothers, all the more reason that you should strive to com-
pete with them.

Boys, none of us can more than faintly realize the far-reaching
effects of the force which we are wielding. The phantom forms
that daily influence and mold the thoughts and fancies of mil-
lions of people are recorded by us. One cannot over-estimate
the consequence of our most thoughtless act.

To you as much as to the director belongs the task of inter-
pretation of the author's idea. You can add inspiration and
strength. You can increase its beauty, subtly render in light and
shade the nuances of expression, show contrast and antithesis,
correlate, delineate.

When your work reveals more than mere mechanical repro-
duction, when it shows both thought and imagination you have
ceased to be an artisan. You are an artist.

An artist is not a man with a flowing tie and baggy trousers, nor
a k>ng-haired genius in frayed paats> although quite a lot of us

ass

seem to have that impression, if appearance is any critcdon.

Carelessness in dress, action or speech betray the same charac-
teristic in work and in tecluiique. It is a moth-eaten idea that the
artist and genius affect eccentricities of dress and manner. It is
true that many brilliant men are afflicted with human weakness
but it is true also that their brilliancy might have been greater
if their weakness were fewer and that their greatness is not
because of, but in spite of lapses of conduct. You cannot prove
genius or artistic ability by imitating the bad points of briliiaot
men. Mimicry is the artifice of the ape; originality and sdf-
respect the attributes of real manhood.

Dressing neatly, brushing your teeth and wearing decent foot-
gear will not make a sissy of you and you are a lot more pre-
possessing and a great deal more apt to command respect and a
good salary than a man with ability disguised in a shabby suit
and down-at -the- heel shoes.

Your mental habits are harder to overcome than your physical
ones ; the mote that is in your eye is ever the hardest to perceive.
The braggart, the liar, ^e egotist, the pessimist* are all loose
and fluent talkers, and the enchantment of their own chin music
drowns the groans of their unwilling and unconvinced audiences.
You know them all, the braggart and liar who says, "When I was
in India taking the Durbar for Kinemacolor," who wouldn't know
an East India native from an American Indian, if he saw them
side by side, and who never saw a motion-picture camera before
he came from Coshocton. Ohio, sixteen months ago. The egc^-
tist, "Why, I'm the guy that put him in the business. I tau|^t
him everything he knows. I made-1-I-I-." And the fellow
who blames cver>*body and evcrj'thing but himself. He says.
•'If the lens in my camera was any good, and if the camera didn't
buckle and throw a streak of static everytime I turn the handle»
and if the developer hadn't ruined my stuff in the dark room,
and if they hadn't cut out all the good stuff in the cutting room.
it would have been a good picture."

The photographer himself is the only reason for terms of
equality with director and star. There have been photographers
who have risen from photography to directorship, to manager-
ship, even to ownership of companies.

"Hitch your wagon to a star" and plug. Search yourself for
your handicaps and eliminate them. Make up your mind that

asa

?HAPTKR XXni

APPL'VING FOR A POSITION

WHEN applying for a position the proper person lo sec,
if you are not previously acquainted in the studio, is
the Studio Manager,

You should request an interview and when you sec him, in-
troduce yourself and state that you wish a position as camera-
mau in that studio, if there is an opening.

The manager will say if there is an opening, but if he says
there is not, it is useless to insist on an mmiediatc trial of your
ability.

You should, however, request him to keep you in mind and
leave with him your card containing your address and telephone
number — that number is important as studio nwnagers use the
'phone frequently. If you possess a camera, add the name of
its make to your card.

An opening may present itself in that studio in a day or it may
be a month or more before they will require another cameraman.
Sooner or later they will want men and then, if your card has
been filed, they will, verj' likely call you on the 'phone.

We will assume, however, that the manager does require a
cameraman when you present yourself for an interview. He
witi ask you what salary you expect and, if you value your
chances of a position in that place do not make too cheap a
figure. A manager will appraise your worth at exactly what
you appraise yourself. In large, well-established studios a salary
of $too a week will not startle the manager out of a single wink.
In fact, if you ask for less he is very likely to set you down in
his mind as a "crank-turner" or an amateur.

If he states that he wants you to photograph some celebrity
or well-known star — do not hesitate to ask $150. You will get
it if they want you.

At these figures, of course, you will be expected to furnish
your own camera and complete equipment for taking the films
However, you will not be required to furnish rewinders or dark
room fixtures, as these are part of the studio paraphernalia

338

Also, most studios will keep your equipment in repair as they
have well-equipped machine shops and expert machinists.

Of course, experience counts for a lot in securing a position.
The first job is always the hardest to get. After you have made
one good picture the rest is easy. You sliould not say tliat you
have had no experience whatever as that would be fatal. It is
better to say that you have been making film for yourself or free
lancing considerably rather than admit you have not worked in a
studio before. Of course it is advisable to state that you arc
a graduate of a school of photography and to show your diploma
if you have it with you.

Unless you have already practiced with your camera enough
to give you confidence to handle any situation that might arise
in studio work, it is strongly advised that you first obtain a
position as an assistant cameraman so that you can learn the
ropes and adjust yourself to the customs and practices of studio
work. If you have ability and perseverance you will soon get
a chance to be promoted to cameraman with a substantial raise
in salary. This salary will possibly not be as much as if you had
attempted a cameraman's job, but you will be in a much more
comfortable position of having demonstrated your ability as
you went along. As soon as you have made a successful picture
as a full-fledged cameraman you can again get a raise in salary —
if not in the same studio, in another. One of the peculiarities
of the film business is that it is generally easier to get an in-
crease in salary by changing a position than to try to get the
increase you arc entitled to in the place where you are working.

You will, perhaps, be engaged on trial — services to terminate
without notice if desired on either side. It is then up to you to
show them that you are a man they cannot be without. If the
foregoing instructions are carefully followed you can do this
and establish yourself as a fixture in that studio as long as
they make pictures and you wish to stay.

When going to seek a position it is advisable to wear your
best clothes. There are a number of itinerant crank-turners
running from pillar to post and never remaining anywhere and
they usually exhibit their shiftlessness in their appearance. You
do not want to be considered one of these.

Lastly, be considerate to your other cameramen. Do not act as
if you knew it all just because you may have had a college cduca-

330

teOTION PICTURE PHOTOGRAPHY

tion in cinematography, while they have gone through the long
school of experience. You may Iiavc learned as much in a few
weeks as tliey have gained in five years, but they arc entitled to
your consideration and help, if needed. A man may not know
what the focal length of a lens is and yet may get good results.
Some day he may have a puzzling effect to work out and may
come to you for the explanation because you have had theoretical
training as well as experience and practice — an ideal combina-
tion. Only a boor would then strut and throw out his chest
and proclaim himself the great- know- it-all.

If you wish to impart some of your precious knowledge, do
so with gentleness and modesty. You will make friends among
your colleagues and they will respect and admire you.

Many oiJcrators have purchased their own motion picture
cameras and have added materially to their income by filming
local events for exhibition in the theatres of their home town.
All of the topical or news weeklies are ready to purchase negative
films of subjects of national interest and, while we do not all
live in localities where pictures of such events may be obtained,
except at very long intervals, yet many ingenious cameramen
have discovered common things in their own territory which,
when carefully taken and titled proved of general interest and
salable to some of the big producing concerns.

Beautiful scenery and places of historic interest are in greater
demand than c%cr before. The European war cut down the sup-
ply of available foreign scenic stuff and awakened an interest
in the American public to tlie beauties of its own country. "See
America First" is a slogan that should stir a thrill of real
patriotism in the breast of every American citizen, and the mo-
tion picture is pre-eminently the medium of showing to the
great masses of our people, who, for one reason or another,
are not able to travel, the almost unknown grandeur of our own
United States. Even those people who have had the good for-
tune to see the wonders of America enjoy the many memories
recalled to them by a picture of their past travels.

Motion picture cameras are costly pieces of apparatus, it is
true. The operator who wishes to begin modestly and is will-
ing to start with a camera that, although a long way from a
professional studio camera, is still capable of doing remark-
ably good work, can purchase one of those amateur instrumenta
for less than a hundred dollars.

APPLYING FOR

P 0 S I T I ON

It is uot necessary ihat the owner of a camera should develop
and print pictures, although, doubtless, many of the ingeniously
and mechanically inclined among you would be highly interested
in doing your own work. If you can take and finish pictures
with an ordinary camera, you can do the sanoe with a motion
camera.

There is a large and ever broadening field for local talent that
need not in any way conflict with that of the strictly professional
studio cameraman.

Tlie enormous development of the motion picture industry has
aroused the interest of millions of people and there are thou-
sands of subjects of purely local or sectional interest which, while
they are entirely outside the range of work of the big studio or
factory, yet would be a profitable employment for the man who
has the preliminary training that the motion picture operator
must have acquired.

If your town has an event such as a celebration, a corner-
stone laying, a football or baseball game, anjthing that brings
out masses of people to sec and hear men of great local im-
portance, arrange to take a picture and let the local theatre use
it for a stated sum, or, better yet, in certain instances, play it
for a certain percentage of the box office receipts. Get as
many of the local people in the picture as possible; most of them
will come to see how they look on the screen.

Some camera owners have been very successful in making ar-
rangements with local papers to conduct a popularity contest,
after which the winners were used in staging a little play in
local surroundings. The interest aroused by the advertising
will bring out a large crowd to see the picture on the screen, and
a local theatre can well afford to change a small additional en-
trance fee and give you a good percentage of the box office
receipts for the privilege of running it. Often the local theatre
and local paper can be induced to work in conjunction on this
kind of contest stimulating interest by throwing side pictures of
the contestants and the progress of the voting upon the screen.

Another source of revenue from a picture of this kind is
that of advertising various merchants and industries, by using
them for backgrounds in the story and charging a reasonable
price for this publicity.

For work of this kind it is, of course, almost imperative that
you use a camera of professional grade.

331

APPLYING FOR

P 0 S I T I ON

more than fifteen or twenty feet — ten feet is sometimes enough.
Do not show the same process more than once, unless from a
different viewpoint to explain it more clearly, and avoid monoto-
nous repetitions. Don't let the manufacturer mislead you as to
what is interesting. His business can never be as interesting to
another as to himself.

I know two young follows who have hobbies. One is in-
terested in small animals, the other in insects — one lives in
California and the other in a small town in New York State.
Each of them has fitted a small studio for himself. Both are
turning out negatives on the subjects embraced by their hobbies
and selling them to big companies to be used to &)1 out split
reels or for educational subjects.

Chapter XXIV
BIBLIOGRAPHY

ONE of the hardest problems that confronts the student of
cinematography is how to find out the things that he wants
to know. This book was compiled to answer most of the
questions that puzzle the beginner and more advanced workers
as well. Yet no one book can hope to cover all subjects and enter
minutely into all of the ramifications of all the diverse branches
of work embraced in the art and science of cinematography. In
the first place, as cinematography is based on photography it
would be superfluous to try to cover that subject before treating
the main subject.

On the subject of still photography there are already printed
and for sale a mtjititude of books which cover the subject more
adequately and thoroughly than could be attempted in a text
of this kind and the many still photographers who will purchase
this course would not wish to pay for the additional matter with
which they are already familiar. Those who have not already
acquired a foundation training in still photography are advised
to secure text books on the subject and study them before at-
tempting to go deeply in the art of motion picture making.

For those who wish to consult literature on photographic and
motion picture topics the following list of books has been
prepared. There are many, many books on photography which
arc very good but which are not included in this list. This list
has been compiled to help the earnest student of cinematography
and each book listed is valuable in something which has a bearing
on motion picture photography, although only those bodes listed
under cinematography are devoted exclusively to that subject.

On account of the interference of the war with book publish-
ing many of the books listed are now out of print and, too, in
some cases, the price has been advanced. Copies of out of print
books may, however, be consulted at libraries and stray copies
of others may be picked up from photographic supply houses
that were well stocked before the war.

334

BIBLIOG R A PH Y

HANDBOOKS ON ELEMENTARY PHOTOGRAPHY

Books under this heading give the primary lessons in still
photography. No one should attempt motion picture photog-
raphy without having first mastered the principles of still camera
work, both practically and theoretically. It is not intended that
the student should buy every book in the list. One or two
titles that apjieal to him most will be sufficient.

Experimental PuoTocRiVPiiY by Clement J. Lcapcr. A be-
ginner's experimental course in photography, giving simple ex-
planations of why and how. 1898. (English) 99 pp. Cloth,
50 cents. Andrew J. Lloyd Co., Boston, Mass.

Early Work in PiiOTocRAriiY by W. Ethelbert Henry (Eng-
lish). A useful handbook, illustrated, with a chapter on lenses
by H. Snowden Ward. 3d edition, 1901. Cloth, 50 cents.
lAndrew J. Lloyd Co., Boston, Mass.

How TO Make Good Pictures. The Eastman manual for
beginners, with chapters on special subjects by noted workers,
illustrated. Paper, 25 cents. Cloth, $1.00. Eastman Kodak Co.,
Rochester, N. Y.

Elementary Photography by John A. Hodges (English).
About 100 pp. 1898. Qoth, 50 cents. Andrew J. Uoyd Co.,
Boston. Mass.

The Right Road into PnoTocRApny by Dr. J. Nicol. 1898,
A simple guide for the novice, plainly written, with instructions
and formulae. Paper, 83 cents. Andrew J. Uoyd Co., Boston.
Mass.

Principles of Simpi^ Photography by F, W. Sparrow. 1902.
(English) 130 pp. Illustrated. Qoth, 50 cents.

Photography for Novices by Percy Lund. 200 pp., 50 cents.

Beginners' Troubles (Photo-Miniature, No. 114). Paper,
35 cents. Tennant & Ward, New York Gty.

Library of Amateur Photography, 4 vols. Comprehensive.
1,620 pp. The most complete work of its kind and a valuable
reference library. This work is out of print but may be found in
libraries and second-hand book stores.

Instruction in Photography by Sir De W. Abney. Eleventh
Edition, illustrated. Large i2mo. Cloth, $2.50. J. B. Lippin-
cott, Philadelphia. Pa.

The Romance of Modern Photography by Charles R. Gib-

333

'MOTION PICTURE PHOTOGRAPH Y

son. 63 illustrations. 345 pp. gva Qoth, $i.sa J. B. Up-
ptncott* Philadelphia, Pa. J

Saturday With Mv Caugsia by Stanley C Johason. Wttbl
over 100 diagrams and plates, 8va Ckxh, $i.5a J. R
pincott. Philadelphia, Pa.

Photography or Tcoay by H. Chapman Jones, 54 iUastratic
and diagrams. 34* pp. Crown 8va aoth, $i.5a J. B. Ltppincot(
Philadelphia. Pa.

PiioTO-Mi.NiATURE Series, Tcnnant & Ward, New York City^
35 cetils each.

The Pocket Classics of Photography. Each book coven
different subject and covers it welL Written in a f«*T
which e\-er3' one can understand from a practical standpoint Aa\
there are nearly two hundred subjects in this scries on photog*]
raphy and a new subject appears each month the list is too \oag\
to print here They arc carried by all photo supply booses or|
a complete list may be obtained from the publishers.

ADVANCED GENERAL TEXT BOOKS

Books for more advanced workers in still photography.

Practical Pocket Book of Photogbaphy by E. Vijgel, (Eng-
lish) 1896. Comprehensive, brief. Cloth, $1.25. Andrew J.
Uoyd Co., Boston, Mass.

Photographic Instruction Text by George H. I^tridge.
igoo. A practical book. The outgrowth of a class in photog-
raphy at the Lewis Institute, Chicago. 230 pp, Ck>th, $l.oa
Andrew J. Lloyd Co., Boston. Mass

Professional Photography by C. H. Hewitt. In two
volumes (English) 1904, Illustrated. Cloth, 50 cents per vol.
Andrew J. Lloyd Co., Boston, Mass.

CosasE Photogr-^phy by E, O. Hoppe» F. R. P. S., 1912.
$4.oa The mathematical principles of photography and how to
apply them. An accurate system for the careful and exhaustive
student. Photo-Era, Boston, ^fass.

Photography roR Students op Physics akd Chemistry by
Louis Derr. A.M., SB. 247 pp. $200 ^9^^ MacMillan Com-
pany, New York. Not so complicated as the title sounds and an
excellent book for those who really want to know the scientific
principles of photography.

Ba&net Book or I^otography containing a complete photo-

BIBLIOGRAPHY

graphic education. Every branch of photography is gone over in
a way easily understood. Many formulae for various processes.
68 cents. Bass Camera Co., Oiicago, 111.

Watkins' Manual by Alfred Watkins. 140 pp. 50 cents.
Burke & James, Chicago., III. This book gives many useful
tables, formulae, illustrations of negatives and prints, which show
comparative results of correct and incorrect exposure and de-
velopment. It deals with all branches of photography, such as
interior work, copying, enlarging, reducing, "pinhole" photog-
raphy, snapshots, speed standards, lantern slides, printing in-
tensifying.

British Journal Almanac Year book of Photography,
['aper, 75 cents. Cloth, $1.25. Contains many valuable fonnulae
and tables and a resume of the photographic improvements and
progress of the year. Carried by all good photo supply houses.

REFERENCE WORKS

No earnest worker can lie without some reliable works of
reference in his profession. The best reference book that one
can obtain is a large loose leaf note book in which are filed the
(ormulae and notes of the worker's personal experience and the
pertinent articles that can be gradually accumulated from all
sources, co-workers, trade journals, direction slips from pack-
ages of films, plates, papers, catalogs. After that come the
standard reference works.

The Photograph kr's Notk "Book by R C. Lambert. 1897.
(English). 250 practical hints, formulae, etc.. clipped from all
sources as worth saving. 80 pp. Cloth, 50 cents. Andrew J.
Lloyd Co., Boston, Mass.

Processes of Pure Piiotocraphy by W. K. Burton and
Andrew Pringle. A standard compilation of the principal nega-
tive and positive processes. 1889. 20O pp. Paper. $2.00.
Andrew J. Lloyd Co., Boston. Mass.

The Photographic Reference Book by G. H. Mcintosh
(English). Tells "how to do" things rather than describe
methods. Brief and to the point. 835 references. 336 pp.
Paper, 75 cents. Andrew J. Lloyd Co., Boston, Mass.

Cassell's Cyclopedia of Photography, 1912. 572 pp. The
most complete, up-to-date, reliable and easy reference photo-
graphic book of recent years. Cloth. $3.75. Photo Era, Boston,

Mass.

337

MOTION PICTURE PHOTOGRAPHY

The Dictioxary of Photography by E. J. Wall, F^P.S^
600 pp. $2.50. Photo Era, Boston, Mass. Readily accessible
information compiled like an encyclopedia or dictionary.

A RF.FiiRiiNCE Book of Practical Photography by F. Dundas
Todd, A collection of valuable paragraphs on chemical proc-
esses, apparatus, etc. Paper, 25 cents. Tcnnant Si Ward,
New York City.

Figures, Facts and Formulae of Photography (Photo-
Miniature 134). A new selection, comprising a treasury of in-
formation for amateurs, gathered from practical experience^
35 cents. Tennant & Ward, New York City.

PHOTOGSAPHEJt's NoiE BoOK AND CONSTANT COMPANION by

Rev. K. C. Lambert Contains 250 practical hints, formulae, ex-
pedients, etc. 88 pp., 60 cents. Tennant & Ward, New York
City.

A Photographic Reference Book by J. Mcintosh. One of
the most complete and valuable collections of photographic for-
mulae in existence. Paper, 75 cents. Tennant & Ward, New
York City.

Cyclopaedic Photography by E. I-. Wilson. Though pub-
lished many years ago, this American cyclopaedia is extremely
complete on all standard processes of photography. $2.50.
Tennant & Ward, New York City.

Photography of Today by H. C. Jones. A simply told ac-
count of the origin, progress, and latest achievements in photog-
raphy. Illustrated. 242 pp. $1.85. Tennant & Ward. New
York City.

The Advance of PnoroGRApnv, Ita Hist(MIV and Modern
Application by A. E. Garrett. A descriptive handbook of
photographpy, paying special attention to its scientific applica-
tions. $4.25. Tennant & Ward, New York City,

OPTICAL L.\NTERN WORK

The old-time projection machine or "magic lantern" is still in
the ring, although the motion picture projector has handed it a
mighty wallop in the jaw. Many thousands of slides are still
being made, and many a projection machine operator might im-
prove both his time and his finances by learning how they are
made.

The motion picture projector is also an optical lantern and a

33S

BIBLIOGRAPHY

number of books listed under cinematography treat also of the
use of the projection machine.

Motion Picture Handbook for Managers and Operalors by
F. H. Richardson. $440. 432 pp. Moving Picture World,
516 Fifth Avenue, New York City. The recognized standard
book on the work of projection. Complete descriptions and in-
structions on all leading machines and projection equipment In
any projection room this carefully compiled book will save its
purchase price each month. Illustrated with numerous cuts and
diagrams.

The Modern Bioscope Operator. Qoth, 200 pp., 4 shillings.
Ganes, Ltd., 31 Litchfield Street, London, W. C An English
book on projection machine operation.

Lantern Slides (The Photo- Miniature Scries No. 9). 35
cents. Tennant & Ward, New York City.

Lantern Slide Manual by John A, Hodges, (English),
140 pp. Diagrams. Cloth, $1.00 Andrew J. Uoyd Co.,
Boston, Mass.

Coloring Lantern Slides (Plioto-Minialure Series, No. 83).
Paper, 35 cents. Tennant & Ward, New York City.

Lantern Slide Making by F. C. Lambert, a very satisfactory
manual, illustrated (English), 144 pp. Cloth, 50 cents. Andrew
J. Lloyd Co., Boston, Mass.

The Optical Lantern (Photo-Miniature, No. 119). Paper,
35 cents. Tennant & Ward, New York Gty.

The I^ntekn and How to Use It by C. Goodwin Norton and
Judson Bonner. Full details of all varieties of projection, in-
cluding the motion picture, with all kinds of illuminants and
lanterns. A complete treatise on how to nm a lantern exhibition.
143 pp. 60 cents. Tennant & Ward, New York City.

Practical Slide Making by G. T. Harris. Simple working
instructions for every process tn the making of slides. 60 cents.
Tennant & Ward, New York City.

Optic Projfxtion by Henry Philips Gage. $3.00. 1914.
Comsiock Publishing Co., Ithaca, N. Y.

LIGHT AND PHOTOGRAPHIC OPTICS

It is astonishing how ignorant most photographic workers are
of even th<^ simpler principles of optics. Wliat would you think
of a mechanic who did not know what his tools were for or what

aaa

MOTION

PICTURE PHOTOGRATHY

they could do ? The photographer's lens is his principal tool and '
yet how little the most of thein know about the lenses they use
Diaphragm openings seera the greatest of mysteries to many.

Photographic Lenses by C. Beck and H. Andrews. Pub-
lished by a firm of manufacturing opticians as an advertisement ^
of their specialties, but containing more practical information on '
the choice and use of lenses than any other work at the price.
288 pp. Illustrated (English) 1902. Qoth, 75 cents. Andrew
J. Lloyd Co., Boston, Mass.

Photographic Lenslj. How to choose and how to use. Byj
John A. Hodges. 1898 (English). A good elementary liand- '
book. Cloth, $1.00. Andrew J. Lloyd Co., Boston, Mass^

The Lexs. A practical guide to the choice, use and testing-,
of photographic lenses. The latest and most satisfactory hand-
book on the every day use of lenses. By Thomas Bolaa andj
George E. Brown (English), 164 \y[). Cloth, $1.25. Andrew
J. Lloyd Co., Boston, Mass.

First Book of the Lens, a treatise on the action and use
of the photographic lens. Not elemcntar)-, despite its title, but
valuable to those familiar with mathematics. By C. W. Piper.
170 pp. (English), $1.25. Tennant & Ward. New York City.

PHOTotiKAPHic Optics by R. S. Coles, M.A. 1808. An advanced
manual for modem workers. Cloth, $2.50. Andrew J, Uoyd
Co., Boston, Mass.

Choice akd Use of Lenses (Photo-Miniature Series, No.
79). Paper, 35 cents. Tennant & Ward, New York City.

Practical Notes on Telephotography. A pocket book full
of reliable information on its subject. (English) 1901. 25 cents.
Andrew J. Lloyd Co., Boston, Mass.

Tf.i-ephoto Wukk by G. H. Dcller. 63 pp. 50 cents. Andrew
J. Lloyd Co., Boston, Mass.

Practical Telephotography (Photo-Miniature Scries, No.
90). Paper, 35 cents. Tennant & Ward, New York City.

CllEMISTRY OF PHOTOGRAPHY

The action played by the chemicals used in photographic solu-
tions is an interesting one, and one does not need to be a diemist
to get a very good idea of why each particular chemical 13 used
in a bath, and what effect it has on the photographic image.

Chemistry for Photographers by C. F, Townsend. An

340

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^^^^E^^^^^^^B

IRLIOCRAPHY

excellent first handbook, not exhaustive, but simple and prac-
tical (English). 3d edition. 1902. Cloth, 50 cents. Andrew
J. Lloyd Co., Boston, Mass.

The Elementary Chemistry of Photographic Chemicals
by C S. Ellis (English). 191J. 113 pp. Cloth, 50 cents,
Andrew J. Lloyd Co., Boston, Mass.

Photographic Chemicals { Hioto-Miniatnre Series, No. loi).
Paper, 35 cents. Tennant & Ward, New York City.

CuEMiSTRV FOR PHOTOGRAPHERS by Wm. R. Flint. No knowl-
edge of photography is complete without an understanding of the
chemistry underlying its processes. The author has written a
book for the photographer who knows no chemistry, and has
described every type of reaction underlying the photographic
processes in language so simple that no knowledge of chemical
fundamentals beyond what is given in the book is required. The
reader who masters this book will know exactly how to proceed
in every photographic process to insure success. $2.00. Tennant
& Ward. New York City.

PnoTOGRAPHic Chemistry (Photo-Miniature Series No. 149).
Practical information about the chemistry of ever>"day photo-
graphic processes ; the making of emulsions for plates and papers ;
developers and development; intensification and reduction; the
making of prints; fixing; mixing chemical solutions, etc. 35 cents.
Tennant & Ward, New York City.

The Chemistry of Photography by R. Medola, A textbook
embodying a series of lectures on the theory of the chemistry of
photography delivered in Dublin, and chiefly valuable to students.
$2.20. Tennant & Ward, New York City.

BOOKS ON CINEMATOGRAPHY

The br>oks under this heading comprise nearly all of the works
published that are now in print which deal directly with cine-
matography.

Practical Cixematocraphy and its Application by Fred-
erick A. Talbot. 262 pp. i2mo. $1.10. J. B. Lippincott,
Phila., Pa. This is a po]nilar work by an English writer and
while it is published for the general reader, and the moving pic-
ture fan. it holds much of interest for the cinema tographcr. It
gives the fundamentals of motion picture production, describes
the different sorts of cameras and projection apparatus used,

341

MOTION PICTURE PHOTOGRAPHY

and gives working methods of developing of film, printing the
negative, and the operation of projection. Very complete in its
information and abundantly illustrated.

Moving Pictures: How They Are Made and Workhj by
Frederick A. Talbot. 270 pp. $1.50. J. B. Lippincott» Phila.,
Pa. On the same style as the above but containing different
material about the same subjects. Not a textbook, but an in-
teresting account of the many uses of motion pictures, and wdl
worth reading and adding to your library.

Cyclopaedia of Motion Pictlre Work by David S. Hulfish,
2 vols. $4.00. American School of Correspondence, Chicago,
111. About one-quarter devoted to motion picture photography
and the remainder to projection. Also treats of picmrc pro-
duction from the producer's and scenario writer's standpoint.

The A. B. C. of the Cinematocjkaph by Cecil N. Hepworth.
128 pp. 50 cents. Tennant & Ward, New Yoric City. Not an
up-to-date book, but valuable as the best authority on camera
movements, and interesting from an Iiistorical standpoint.

Living Pictures: Their Histokv, Reproduction and Fhac-
TiCAL Working by Henry V. Hopwood. 1899. 265 pp. and
index. One of the first books published about moving pictures.
In spite of its age, it contains a good deal of valuable informa-
tion and IS a standard work,

TjiE Handbook of Cinf.uatocr.\phy, 200 pp. 6 shillings and
6 pence, or $1.60. Kincmatograph Weekly, Tottenham St.,
Tendon, W., England. Comes the nearest to being what might
be called a textbook on motion picture photography in this list.

How TO Make and Operate Moving Pictures by Bernard E.
Jones. 168 pp. $1.00. Funk & Wagnalls, New York City. A
very good book for the amateur cinematographer. To the be*
gliincr who wishes to learn tlic first steps this book is very good,
but for the professional and the man already in the game, it
contains little of value.

The Art of thf, Movikg Picture by Vachcl Lindsey. 128 pp.
$1.25. MacMillan, New York, N. Y. Not properly a book on
motion picture photography at all but has many interesting ideas
for the cinematographer and the producer to think about.

Making the Movies by Earnest A. Dench, 1916. $1.25.
MacMillan, New York, N. Y. A "popular" science type of book
for the man in the street. Interesting and inst'uctive but not
professing to teach anyone to become a camcram<N«^

343

BIBLIOGRAPHY

How Motion Pictures Are Made by Homer Croy, 1918.
Haiper & Bros,, New York City. 366 pp. An account of the
development of the motion picture industry in America written
in an entertaining fashion.

Motion Picture OrERATioN, St.\ge Electrics and Illusions
by H. C. Hortsmann and V. H. Tousley. A practical handbook
and guide for theatre electricians, motion picture operators, and
managers of theaters and productions. Clear, comprehensive,
and accurate. $2.00. Tennant & Ward, New York City.

A B C OF Motion Pictures by K. E. Welsh. A practical first
book on this subject. 55 cents. Tennant & Ward, New York
City.

The Theatre of Science by Robert Grau. $5.00 Broadway
Publishing Co., New York City.

The Photoplay: A Psychological Study by Hugo von
Munsterbcrg, $1.50, D. Applcton & Co., New York City.

A Camera Actress in Tocol.^nd by Miss M. Gehrts, J. B.
Lippincott. Phila., Pa.

Tue Guide to Kinematocrapiiy by Colin N. Bennett. $1.50.
E. T. Heron & Co., Ltd., Tottenham Street, I^ndon, W. This
handy treatise is a successor to Bonnet's well-known Handbook
of Kinematography and is a rather more concise volume tlian its
predecessor. A variety of subjects is considered ; camera
work, laboratory work and projection; each of these subjects
being treated in a concise manner designed to be well understood
by the novice or student.

Tinting and Toning Motion Picture Film by Dr. Kenneth
Mees, $2.50. Eastman Kodak Co., Rochester, N. V. (Out of
print.)

LmNG Pictures by R. B. Foster, 1915. Hatton Press, Ltd..
London, England.

Motion Picture Education by Ernest E. Dench. $2.50.
MacMtllan, New York City. A treatise on methods of using the
motion picture for institution and commercial use.

Advertising by Motion Pictures by Ernest Dench. $t.6o.
MacMillan, New York Gty. Covering the commercial end of the
motion picture industry. Of interest to any camera user, with
the increased popularity of the motion picture camera, this book
is valuable to any one contemplating the purchase of a motion
picture camera. Has many money-making devices which are
open to everyone owning a cine camera. 255 pp. Illustrated.

343

MOTION PICTURE PHOTOGRAPHY

La Chronophotographie by Louis Gastinc. 1899. $txxx
Gauthier \'illars el Fils, 55 Quai des Graiids-Augiistins, Paris.
A book of early cinematographic history, containing intCTCStia^J
illustrations of the early apparatus and results o{ Marey aBd[
others. Printed in French.

La Photographie Anim^e by Eugene Trutat $1.50. Pub-
lisher Gauthier Villars. Paris, 1899. A splendid edition with^
fine illustrations showing the early cameras and projectors used
by the various well-known foreign firms. The subject of persss*]
tence of vision is explained in the thorough French stj-Je. Some
present day inventors would open their eyes after reading lliis
book, which shows that many "new and novel" mechanisms orig-
inated long ago. Printed in French.

Le Cinematographe: Scientifique et Industrie!- by Jaqnes
Ducom. $2.00. Publishers, Cinema Rcvuc, 118 Rue d'Assas,
Paris, 191 1. A pretentious volume, written in scholarly style ^
and illustrating all the well-known foreign cine cameras an-l
laboratory devices. A feature is the inclusion of the complete
text of Demeney's "Les Origines du Cinematographe*' (an im-
portant chronology of early patents). In addition to the fine,
illustrations EHicom's work contains practical instructions and
working formulae, which combined with the historical chapters
make it a most desirable reference work. Printed in French.

Conferences Sur La Cinematogr.\phe by E. Kress. $ijx».
Publishers, Cinema Revue, Paris, 191 2. Seven pamphlets. In
this set of seven booklets the technique of motion picture produc-
tion is studied from all angles. There is one booklet on raw
film stock, and one on the early history of the art, while another
treats of studio construction, lighting and proper costimiing.
Three numbers are devoted to a very good description of present
day French cinematograph cameras, while the remaining booklet
explains how all of the wonderful dissolves, visions, and tricks of
the French film makers are accomplished. Printed in French.

La Technique CiNEMATfH:iR.\pmQUE by Leopold Lobcl. $2.50,
Publishers, H. Dunod and E. Pinat. 47 Quai des Grands-
Augtistins, Paris, 1912. Printed in French.

Motion Picture Making and Exhibiting by John B. Ratb-
bun, $1.00. Publishers, C. C. Thompson Co., Chicago, 1914.
This IS not a book of working instructions and fonnulae but
rather a description of the various processes involved in the

344

taking, making and exhibiting of motion pictures. As such the
ground is fairly well covered by the author who, it apiwars, is
not a practical film maker. Good illustrations contribute largely
to the interest of this little volume.

Picture Play Piiotograpiiy by H. M. Lomas, F.R.P.S.. $1.50.
Publisher, Gaines, Ltd. (The Bioscope) London, 1914. Lomas
while quite skilled in the science and practise of ordinary photog-
raphy does not provide as valuable a treatise as might be expected.
The studio arrangements and lig:hting described are distinctly
English, while in these, as is well known, we lead our otherwise
superior (photographically) British cousins in the art of cine-
matography. There are some good points brought out by Lomas,
however, and while not very comprehensive the work will doubt-
less prove interesting to the amateur worker.

Die Ki.nkmmograi'hie by K. W. Wolf-Czapck, published by
Union Deutsche Vclagsgescllschaft, Dresden, it)oR. price about
50 cents. In this booklet the late Herr Wolf-Czapek. always a
keen student of the cinematt^raphic art, explains the phenomena
of persistence of vision and lays down the rudiments of cine-
matographic practice for the benefit of amateurs. Printed in
German.

Magic, Stage Illusions and Scientific Diversions, by Albert
A. Hopkins. $2.50 Munn & Co., Inc., New York City. This
book is not a cineiwatograpbic work at all, but, nevertheless, it
forms an important and indispensable addition to the literature
of motion photography. While the bulk of this work is devoted
to elucidating the mysteries of stage-craft and the illusions of
the showman, there arc a number of cliai>ters at the close of the
book which deal with the making and exhibiting of motion pic-
tures as practised in the early days of the art. A chapter on
Chrnnophotography details and illustrates the experiments of
the Trench pioneer, Marcy, while the following chapter illustrates
such historically interesting devices as Demency's "Chrono-
photographc (The first Gaumont apparatus), Jenkin's "Phanto-
scope," Kdison's "Vitascope," Lumierc's "Cincmatographe" and
Caster's "Muloscope" and *'niogrriph." All of the early devices
are Illustrated from woodcuts which appeared in the Scientific
American years back, and this is the only work at present obtain-
able in which these old time cameras and projectors are figured.
As a matter of fact we know of no other picture of the Edison
"Vitascope" than the reproduction shown in this work.

345

MOTION

PICTURE PHOTOGRAPHY

Der Kinematograpu by Dr. Carl Forch. $i.oo. Publisher,
A. Hartlcben, Leipzig. 1913. A variety of cameras and projec-
tion devices are illustrated, ranging from the days o{ the Luniicre
"Cinematographe" to the latest in "natural color" systems. In-
termittents of many types are discussed and the geometry of
Geneva movements is gone into. Printed in German.

Animated Pictures by C. Francis Jenkins, published by the
autlior, 1898, Washington, D. C. (out of print). This volume,
by one of the earliest makers of motion pictures on flexible cel-
luloid strips, is perhaps the earliest extended treatise on cine-
matography. Camera work, perforating, printing and develop-
ing are dealt with, and illustrations of all the author's early de-
vices and mechanisms are presented. Particular mention must
be given the bibliography of articles and the list of patents on
animated photography prior to the year 1896 which are given
in this book.

346

Chapter XXV

APPENDIX
MAKING DIRECT POSITIVES

THE problem of making positives direct in the camera with-
out the expense of making the extra negative film where
only one copy is desired has occupied the attention uf many
experimenters.

The following method will enable anyone familiar with the
ordinary film manipulations to make good projectablc positives
direct in the camera.

To the camera owner who lakes pictures for his own amuse-
ment, or the man who makes a single picture for his local theatre,
this method will prove a great saver in cost of materials.

It is really a means of making a negative on a strip of film and
then printing that negative on the same strip and destroying the
original negative by a chemical process leaving the positive print.

It requires a particular style of developing apparatus, that is
a drum of metal or wood painted with black Probus paint or
other similar black photographic enamel which is resistant to the
action of photographic chemicals. This developing drum must
be smooth and tight, the skeleton type with ribs will not do, as
we shall see presently.

Negative film may be used but positive film is much preferable
where the strength of the light permits. Positive film gives much
clearer, brighter, snappier results, i.e., negative film having a
tendency to flatness and graying the high lights. As positive
stock is very much slower than negative stock a much larger
diaphragm opening must be used and if interiors or badly lighted
exteriors are to be taken negative stock must be used. In either
case the exposure must be rather full so that the image may
penetrate well into the bromide of the silver film.

A very contrasty hydroquinone developer is the best to use
although the usual fornnila for positive titles works very well.
The following is a good formula :

347

MOTION PICTURE PHOTOGRAPHY

Hydrocjuinone i oi.

Sulphite of soda (Dry) ii 02.

Carbonate of soda (Dry) 7 oz

Potassium Bromide 1 02.

Water i gallon

Alcohol 1 pint

The alcohol may he omitted but enables the developer to be
used at a higher temperature thereby giving greater contrast-
Development should be slow with dim, red light so as to give
a brilliant snappy negative with pure whites and deep blacks.
l>evelopnient must be continued until the high lights have fully
penetrated to the other side of the film and the picture js plainly
visible from the back. This kind of development is the chief
condition of success. After development, wash for five minutes
or more to thoroughly remove all traces of developer.

The development has probably caused the film to swell and
lengthen and it is necessary to cinch it up close to the drum for
the next operation which is that of printing the positive picture.
The drum is carried to a window which admits diflTused light and
turned for ten to twenty seconds before the light. The whiU
portions of the film, usually of creamy white or greenish shade.
soon become grayish. This indicates sufficient exposure and the
drum is carried back to the dark room and rinsed.

In this process the negative on the film is printed on the re-
maining silver bromide in the emulsion which has not previously
been acted upon by the developer. We now see that only a tight
drum can be used on which the film is tightly wound or the re-
sulting positive would be light struck by light penetrating from
the back of the film.

The tight dnim has the advantagjc of being very economical
of developer as a shallow semi-circular (rough in which the drum
if revolved will develop a two-hundred foot drum of film witli
only a gallon or two of developer.

The negative image is now destroyed or dissolved away in
the following solution:

Water i gallon

Bichromate of potash I J^ oz.

Nitric Acid 3 oz.

This bath, compared with other formulae for the same pur-

348

APPENDIX

pose, is very weak but as a matter of fact a very small quantity
of bichromate is necessary to oxidize the silver of which the
image consists. This bath is allowed to work unti! the negative
image has been entirely dissolved away and only the ^creamy
white of the remaining silver bromide is visible. Tliis remaining
silver bromide carries the yet undeveloped positive image from
which the bichromate solution nmst be thoroughly washed before
immersing it again in the developer to materialize the positive.

The same developer may be used in which the negative was
originally developed although softer results may be obtained
by using the regular nielol-hydro or some other softer working
developer for the second development.

After the second development the positive should be fixed for
five minutes in a fixing bath containing acid hardener or, if fixed
in a plain bath, hardened afterwards with formalin solution or
a 5% solution of chrome alum.

The two developing solutions and the reversing solutions all
have a softening effect on the film and care must be taken that
the temperature does not rise sufficiently to cause the film to
frill.

If trouble is experienced with softening of the film the fol-
lowing develoj^er may be substituted for the one given :

Hydroquinone 2 oz.

Sodium sulphite (Dry) 2>i lbs.

Formaldehyde 2 oz.

Water I gallon

This developer works very contrasty indeed and has the smart-
ing, disagreeable odor of formaldehyde: but will absolutely pre-
vent frilling. This is distinctly a hot weather developer and
must not be used under 70° Fahrenheit.

Do not forget that a thorough development of the negative is
essential to the success of this process. If this is not thoroughly
done, then the lower strata of the emulsion will still contain un-
developed bromide of silver which has not been reduced to a
silver negative image by the negative development and which
in the following second development will be reduced in the high
lights of the positive doj^ging them with a veil of negative which
has not yet been destroyed because it must be developed before
the bichromate solution can dissolve it away.

349

MOTION PICTURE PHOTOGRAPHY

Do not attempt this process on a valuable exposure until you
have made a number of test pieces successfully and are fully
convinced that you can trust yourself to conduct tlie entire proc-
ess with the same success that you would the ordinary developer
and printing processes.

There are several other methods for making direct positives:

Partial reversals of negatives have been obtained by the addi-
tion of thiocarbamide and similar reagents to the developer but
completely successful results are seldom, if ever, obtained. The
writer has tried a reversal process similar to that used in the
development of the Lumiere Autochrome plates, but lias never
succeeded in getting good clear liigh lights.

Kor the benefit of those who care to experiment with this in-
teresting subject, the following details arc given:

Give about twice the normal exposure required for a full
timed negative and develop in the developer ordinarily used,
until the high lights show through plainly on the back; after
washing well for one minute the film may be brought out into
the ordinary light of the room and the remaining operations
carried on in this light. Immerse in either of the following
solutions until the black negative image has compteiely dis-
appeared :

Potassium permanganate, 10% solution. . . I dram
Sulphuric acid. 10% solution by volume of

1.98 acid 5 drams

Water 5 oz.

or use this solution :

Potassium bichromate 100 grains

Sulphuric acid 7 fluid drams

Water 10 oz.

The latter solution is probably preferable as it works faster
and is not so liable to stain as the permanganate. Tmnierse again
in the developer when the positive image will develop up. Wash
and dry. It is not necessary to fix in hypo as the silver which is
ordinarily dissolved out by the hypo is what forms the positive
image.

Instead of the second development in developer, a sepia
brown positive may be obtained by using:

350

Sodium sulphide. 20% solution 3 ok.

Water 20 oz.

Formulae are given for small quantities as experiments are
mostly conducted with short lengths of film of from one to
four feet.

Recovery of Silver From Spent Hypo Solutions

For the precipitation of the silver from the hj-po, two capacious
tanks of concrete should be constructed a good distance away
from the building; for the chemical used as a precipitant, when
acted upon by an acid, produces a gas, the smallest quantity of
which being present in the atmosphere of the dark room, fogs
sensitive emulsion just as surely as sunlight would.

Tlie two tanks should each be of sufficient capacity to hold at
least a week's run of si>ent hypo ; the top level of the lower one
being below the bottom of the upper one. Each tank should
be provided with a series of cocks or outlets or an adjustable
syphon, thereby the liquid can be drawn off at any desired level
and a weatherproof, but easily removable cover, and. if the size
of the tanks warrants, a small flight of steps for the laborer
who shovels the silver sludge into barrels.

On account of the disintegrating action of the hypo solution
the concrete should be protected by a heavy coat of asphalt The
upper tank has an inlet pipe from the dark room through which
it receives its charge of solution and all its outlets drain into the
lower tank. The lower tank in turn drains into the sewer.

The precipitating solution is liver of sulphur of the cheapest
commercial grade. It comes in lar?:e chunks of the fused chemi-
cal, varying in color from light brown to dark brown, accord-
ing to the purity. Qiemically it is a mixture of indefinite poly-
sulphide:: of sodium and potassium, and the precipitate which
it forms with the silver is silver sulphide, a dirty, brownish black
appearing substance. Liver of sulphur is very soluble in water
but, on account of the large impervious pieces in which it comes,
it takes a long time to dissolve unless broken up, and breaking
it up is no pleasant job, as it has the quintuple fragrance of
ancient eggs. It is a good plan, therefore, to have a stout barrel
or hogshead of snug-fitting cover, in which are placed water and
chemical enough to have a saturated solution constantly on hand.

3S1

MOTION PICTURE PHOTOGRAPHY

Where it is not possible to have tanks on different levels, a
small bronze centrifugal or rotary pump and electric motor will
take care of the solution nicely. When the upper tank is two-
lliirds full of hypo solution and sulphuret solution, stir with a
wooden paddle and pause once in a while to let the precipitate
settle a little, and take a glass full of the supernatant liquid and
add a little of the sulphuret solution to see if there is any further
precipitation. If it produces a dark brown cloudy precipitate
it is necessary to add more precipitant, but if the precipitate is
only slightly cloudy or absent, the precipitation is complete and
the tank should be allowed to settle until the next day, when
the clear supernatant liquid niay be carefully decanted into the
lower tank. However careful you may be, you will find that
it is imposi^ible to remove all of the supernatant liquid without
a portion of the precipitate escaping into the next tank. It is
to receive and save this escaping precipitate that the lower tank
was constructed. The lower tank is now allowed to settle and
the clear liquid allowed to run into the sewer. This precipita-
tion may be repeated until the accumulation of sludge in the
bottom of the tank is sufficient to warrant putting it into tight
barrels for shipment to the refiner.

If any acid is used in the hypo do not fail to run enough spent
developer solution into the tank to make sure that all the acid
is neutralized and that the solution is decidedly alkaline. If this
is not done the acid will react on the liver of sulphur and foul
the whole neighborhood with the abominable odor of sulphuretted
hydrogen or hydrogen disulphidc, which has rotten e^s backed
off the boards for fragrance.

Reducing solutions and silver intensifying baths may also be
run into these tanks for recovery of their silver content.

Film Development in Hot Climates

Film may be success fmlly developed under tropical conditions,
(up to 95* F.) by means of most developers, with the addition
of 10% sodium sulfate and some potassium bromide in order to
prevent fog, but much better with a special developer compounded
with paraminophcnal hydrochloride. Although it has been rec-
ommended to develop film in the tropics by hardening the same
either before or after development by the addition of a hardener
such as formalin, it is only possible to secure the best results by

352

APPENDIX

using a developer free from such additional agents. The
formula for the developer is as follows ;

Avoirdupois

Paramidophenol hydrochloride 360 grs.

Sodium sulfite ( Des. ) 6 oz.

Sodium carbonate (E. K. Co.) 6 oz

Water to I gallon

Rinse for only one or two seconds before placing in the fixing
bath, olheru'ise the film is apt to soften in the rinse water.

The lime of development with Elastman film at 95* F. for
normal contrast is one and a half minutes though the time of de-
velopment may be doubled by the addition of 100 grams of
sodium sulfate (crystal) per liter of developer.

At temperatures up to 75* F. the regular acid fixing bath
should be used, but at temperatures up to 85* \\ the following
chrome alum bath is necessary:

Avoirdupois

_ Hypo I lb. 12 oz.

Sodium sulfite ( Dcs. ) sJ/j oz.

Potassium chrome alum 11 oz.

Acetic acid (glacial) iGo minims

Water to 1 gallon

Dissolve the snlfile and chrome alum together and add to the
hypo solution finally adding acetic acid.

At temperatures up to 95" F. the following formalin bath
uld be employed :

Avoirdupois

Hypo 2 lbs. 2 oz.

Sodium sulfite ( Dcs. ) 7 oz.

Formalin (formaldehyde 40%) 17 oz.

Water to i gallon

First dissolve the hypo, then the sulfite, and finally add the
formalin.

In order to eliminate the odor of the formalin, the bath shotild
be enclosed in a covcre<l tank if possible. The above baths
keep well at the temperatures stated, so that the special chrome
alum bath is very suitable, while in special cases such as expedi-
tionary work, when very high temperatures may prevail, the
formalin bath will give perfect results.

333

MOT

PICTURE PHOTOGRAPHY

Still picture negatives may be successfully treated in a tray in
the same way as film though so far it has not been possible to
devise a method of using the Kodak film or film pack tanks at
the tem|>eratures named.

Although no difficulty is to be expected when developing gas
light and bromide papers at high temperatures, the use of a stop
bath of 3% acetic acid, and twice the usual amount of liquid
hardener in the fixing bath is recommended.

Oiinc«, OS.; pint, pt.; guart, <|t.; fiotind, lb.; gitlloa, ital.; jCaltii

' n, Or.

Ukited Statks Wkights and Mkasures
abbreviations used below

guart, <|t.; fiotind, lb.; gitlloa, ital. ;
[i«nii 7 weight, pwL; Kraplc, scr.; dram,

16 OZ I pt.

2 pts I qt.

4 qts I gal.

16 OZ. or a pint Is sometimes called a fluid pound.

Troy Weight
24 grs. T pwt.

20 pwls I OZ.

12 OZ I lb.

Zipothecories' Weight

20 grs. ] scr.

3 scr I dr.

8 dr I or..

12 OZ I lb.

The pound, ounce and grain are the same in both
Apothecaries' and Troy weights.

Avoirdupois Weight

1.77 gms X dr.

27.34 grs- (Troy) i dr.

16 dr I OZ.

16 oz I lb.

Encish Weights and Measures

Apothecaries Weight
20 grs. I scr 20 grs,

3 scr. J dr 60 grs.

8 dr I OZ 480 grs.

12 oz I lb 5760 grs.

354

Ciun. I** •

A P PK N D I y

Fluid Measures

60 minims l fluid dr.

8 dr 1 fluid oz.

ao 02 I pt.

8 pts : gal.

The above weights are usually adopted in com-
pounding photographic formulae.

Avoirduftois IVeight

27 11/32 gr J dr.

16 dr I oz.

1602 I lb.

Photographic chemicals are as a rule sold by
avoirdupois weight.

Handy Emergency Weights
In an emergency, coins may be used as weights, and the
weights given in the following table are accurate enough for all
ordinary purposes.

Dime 40 grs.

Cent 50 grs.

Nicklc 80 grs.

j4-T)ollar icx) grs.

>i-DoIIar 200 grs.

Dollar 400 grs.

By simple addition and siibtmction many different weights can
be made with these coins; for instance to obtain a weight of 10
grains, place a cent on one side of the scale and a dime on tlie
other and then add enough of the chemical to balance the scale.

Electrolytic Recovery of Silver From Waste Solutions
The main source of silver lies in the exhausted negative fixing
solutions and in the hypo baths in which positive film has been
fixed. These soliUions are certainly wonh saving, amounting
to $100 or more per month in even a small-sized film laboratory.
By a novel method of precipitating the silver, a plan has been
formed that entirely supercedes the use of that very offensive
cliemrcal, sulphide of potassaun (liver of sulphur). The pre-
cipitated silver is brought about by electro-chemical action, every
grmn contained in the waste hypo fixing solutions being pre-
cipitated, without cither loss or offensive smell, or there are no

3£S

MOTION PICTURE PHOTOGR A P H Y

volumes of liberated sulphuretted hydrogen emitted as is the
case always when the potassium sulphide is used, which is not
only olTcnsive, but is also injurious to the healtli of those who
have to work within its sphere of action, and causes injury to
every kind of sensitive material that may be in near proximity to
vessels that contain the waste solutions. Where there are large
quantities of waste hj-po solution use two aspiialt-Hned concrete
or brick tanks, fitted with stop cocks at intervals from the bot-
tom, to run off the exhausted solution after precipitation, in
the same way as used for sulphide plan. If smaller quan-
tities are used, large barrels will be just the thing. Now for
the process. Obtain half a dozen sheets of zinc, any thickness
will do; suspend them from the top of the tank or barrel by
means of two very stout, long copper wire hooks, these hooks
being held in iwsition by as many woo<lcn strips across the top
of the tank. The bottom ends of the hooks and the sheets of
zinc must be compleleiy submerged in the old fixing solution.

If the bath is alkaline, sulphuric or acetic acid should be added
until it is distinctly acid to litmus paper. The acid condition of
this mixture will set up an electric current, with the result that
the zinc becomes consumed, and the metallic silver is thrown
down as a dark gray powder, so much so that if the liquid is
left undisturbed for a week the whole of the silver will be
thrown down and the liquid above will be clear. The electric
action is due to the copper wires and the xinc plates in contact
with the acid hypo solution.

As soon as this occurs, this exhausted liquid may be drawn
off and thrown away. A good plan to adopt is to fill one tank
first, then arrange this for precipitation while the second tank
is being filled. Of course this will take some time. This wriU
allow complete precipitation in one tank.

This process must be continued until there is a considerable
deposit formed at the bottom before removal in the same way
as employed when using sulphide. The difference between the
two methods is that in one the precipitate is sulphide of silver,
while in the other the precipitate is mainly metallic silver thrown
down without waste.

The cost of scrap zinc is about five or six cents per pound, so
that the cost eventually of precipitating one pound of silver will
not be so much as would be the case with potassiimi sulphide,
the cost of which is about 15 cents per pound.

356

Sixty-five and a half ounces of zinc is capable of precipitating
108 ounces of silver under exact chemical conditions, allowing
for small losses during this method of electrolytic precifntating.
It can be safely stated that a pound of zinc will throw down a
pound of silver.

The following result has been obtained by the method de-
scribed. About 103^ gallons of spent hypo was used. The
dried silver precipitate amounted to fifteen ounces which sold
at fifty cents an ounce. Wlicre it is considered lliat this quantity
has been obtained with but little labor, small cost and no offensive
smell, the method should bid fair to supplant the potassium sul-
phide plan in every photographic establishment. No special
skill is necessary ; any person who possesses a small amount of
common sense can attend to it, insuring as it docs, the depositing
of every grain of silver contained in the old fixing bath, thus
giving a profitable return in cash tliat will aid considerably in
reducing the cost of production.

Dead or Flat Black Varnish for Blacking Inside of
Cameras, Tubes, Etc.

Alcohol 8 oz.

Lamp black 2 oz.

Shellac i oz.

Dissolve the shellac in alcohol by agitation, then add the lamp
black and mix tlioroughly.

Black for Diaphragms, Suuttebs and Other Metallic Parts

Nitric add 4 oz.

Copjjer wire l4 oz.

Dissolve thc'copper wire in the nitric acid and then add slowly
l}4 o^- <^^ water. The parts to be blackened must be thoroughly
cleaned, then heated and inmierscd in tlie acid bath after which
they are taken out and brushed of? or until tlie article shows a
rich blue black.

Ink for Writing on Gr-^ss

White Ink — Mix i part Chinese white (water-color pigment)
or barium sulphate with 3 or 4 parts of sodium silicate solution
(water glass). The sodium silicate solution should have the
consistency of glycerin.

Black Ink — Mix I part liquid Chinese ink (or Higgin's Eternal

357

MOTION PICTURE PHOTOGRAPHY

Ink, or some similar carbon ink) with 2 parts sodium silicate
solution.

Apply with an ordinary steel pen. The ink will dry in fifteen
minutes and will withstand water. It may be readily removed
by scraping with a knife.

Dead Black for Wood

Borax 30 grs. 8 gms

Glycerine 30 minims 8 c.cs.

Shellac 60 grs 16 gms.

Water 8 02 looo ccs.

Boil till dissolved and add

Nigrosine, W.S 60 grs. 16 gros.

Or paint the wood first with

Cupric chloride 75 grs 75 gms.

Potassium bichromate. 75 grs 75 gms.

Water ,. 2]/^ ozs .1000 ccs.

and as soon as the surface dries apply

Aniline hydrochlorate.iso grs. 150 gms.

Water 2>4 oes looo c.c.s.

and wipe off any yeno\v powder that forms. Repeal the process
till black enough, and then rub over with boiled linseed oil.

Waterproofing Solution for Wood

Asphalt 4 ozs 400 gms.

Pure rubber 30 grs 6 gms.

Mineral naphtha 10 ozs.. 1000 ccs.

Apply with stiff brush and give three successive coats, allowing
to dry between each. The vapor from this solution is very
innammablc.

Polish for Cameras, Woodwork^ Etc-

Linseed oil 20 ozs 400 ccs.

Spirits of caJiiphor. . 2 ozs 40 c.c.s*

Vinegar 4 ozs.,,, 80 ccs.

Butter of antimony. I oz. 20 gms.

Liquid ammoma ... ^ oz 5 ccs.

Water % oz 5 c-c-s-

This mixttrre is applied very sparingly with a bit of old flannel,
and thoroughly rubbed off with soft rags.

358

APPENDIX

Blackening Brass Work

A. Copper nitrale 200 grs 450 gms.

Water i oz. 1000 c.c.s.

B. Silver nitrate 200 grs 450 gms.

Water i oz 1000 c.c.s.

Mix A and R, and place the brass work (perfectly cleaned) in
the solution for a few moments, heating it on removal.

Varnish for Brass Work

Celluloid 10 grs 4 gms.

Amyl alcohol K 0^ 'OO c.cs.

Acetone ^ oz 100 c.c.s.

Instead of this cold celluloid varnish, commercial "cold lacquer"
can be used.

To Blacken Aluminum

Gean the metal thoroughly with fine emery powder, wash well
and immerse in

Ferrous sulphate i oz 80 gms.

White arsenic I oz 80 gms.

Hydrochloric acid ... 12 ozs looo c.c.s.

Dissolve and add

Water 12 ozs 1000 cc.s.

When the color is deep enough dry off with fine sawdust, and
lacquer.

Silvering Mirrors CMartin's Method)

In employing the following formulae, it should be well under-
stood that the glass plate to be silvered must be scrupulously
clean.

A. Nitrate of silver 175

Distilled water 10

B. Nitrate of ammonium. 262
Distilled water lo

C. Pure caustic potash. . . I
Distilled water 10

D. Pure sugar candy.... )4 oz.(Avoir.) 100 gins.
Distilled water 5 ozs 1000 cc.s.

grs 40 gms.

ozs 1000 c.c.s.

grs 60 gms.

ozs 1000 cc.s.

oz 100 gms.

ozs 1000 c.c.s.

35»

MOTION

PICTURE PHOTOGRAPHY

Dissolve and add

Tartaric acid 50 grs 23 gms.

Boil in flask for ten minutes, and when coo! add

Alcohol I oz 200 CCS.

Distilled water, quantity sufficient of make up to to 02s. or

2000 C.C.9.

For use, take equal parts of A and B. Mix together also equal
parts of C and D and mix in another measure. Then mix both
these mixtures together in the silvering vessel, and suspend the
mirror face downward in the solution.

Thermometric Rules

The following rules for the rapid conversion of degrees in
one system into another will be found useful:

To convert Centigrade into Fahrenheit:

Degrees centigrade times 9 divided by 5 plus 32.

Ex. — 80" C. times 9 divided by s equals 144 plus 32 equals
176" F.

To convert Centigrade into Reaumur :

Degrees Centigrade times 4 divided by 5.

Ex. — 60** C. times 4 divided by 5 equals 48* R.

To convert Fahrenheit into Centigrade:

(Degrees Fahrenheit minus 32) times 5 divided by 9.

Ex. — 100* F. minus 32 equals 68 times 5 divided by 9 equals

37-^" C.

To convert Falirenheit into Reaiunur:

(Degrees Fahrenheit minus 32) divided by g times 4.

Ex.— 95° F. minus 32 equals 63 divided by 9 times 4 equals
28" R.

To convert Reaumur into Centigrade.

Degrees Rea\unur times 5 divided by 4.

Ex. — 80" R. times 5 divided by 4 equals 100" C,

To convert Reaumur into Fahrenheit.

Degrees Reauanur times 9 divided by 4 plus 32.

Ex. — 16" R. limes 9 divided by 4 equals 36 plus 32 equals
68" F.

Depth of Field

Depth of field is governed by angular aperture, which is a
measure of the angle at the apex of the cone of light reaching

APPENDIX

the plate when focusing on an infinitely distant point of ligiit
The diameter of the angular aperture is the diameter of the
base of the cone when its height is made equal to the focal
length. Depth is often calculated on effective aperture; this
introduces small errors tliat are very generally ignored.

Let a equal focal length divided by diameter of angular aper-
ture, c e<iual diameter of circle of confusion. Usually taken at
O.OI inch but for critical definition 0.0x35 is necessary.

H equals hyperfocal distance. See definition below.

P 100 f=

Then H equals equals when c equals 0.01 inch

ac a

measuring all distances from node of admission.

If we focus on infinity, the nearest object in focus is at a
equal to H.

If we focus on a distance equal to // -}- /» a'l objects are in
11 I- f

focus from — up to infinity. This is the maximum amount

of depth possible.

If we focus on a point at a distance u the distance of nearest
Hu Ilu
object in focus equals equals and the distance

Il-f d
Hu

o£ farthest object in focus equals

equals

H_u-j-f H — d

When / is small compared with u it can be disregarded, and u
snd d can be considered equal, \vhile distances can be measured
citlier from the node or the principal focus.

H
Very approximately, when we focus on a distance equal to —

H H
depth extends from to .

n-hi

n — r

If an image produced with a lens of focal length / and with
aperture of / number a is enlarged » times the result is equiva-
lent, both as regards size and depth, to one produced directly

361

MOTION PICTURE PHOTOGRAPHY

with a lens of focal length nf and aperture f number na, that is,
an aperture of the same diameter.

To produce the same depth with two different lenses the
aperture / numbers must vary in proportion with the squares
of tiie focal lengths

Eastmak Negative and Positive Film Developer fos
Motion Pictures

Developer No. i6 is a formula worked out by the Researrh
Laboratories of the Eastman Kodak Company and recommended
by ihem as beiiig most suitable for the film stock which they
supply. The writer recommends that wherever the conditions
will permit that separate tanks of developer be kept for positive
and nt'i^ativc stock even though the same formula be used in
each tank. A bath which has been used for positives will not
produce as good results on negative stock a& one which is re-
served exclusively for tliat purpose.

DevELOPER No. i6
Dissolve the following chemicals in order named :

Avoirdupois Afetric

Water (8;<3 Imperial gals.) . . lo U. S. gals. . 40 I.

Elon (metol) 180 grs 12 grm.

Sodium sulphite (des.) 3 lbs. 5 02s. . . 1590 grm.

Hydroquinone 8 ozs. 240 grm.

Sodium carbonate (des.) .... I lb. 9 ozs.. . . 750 grm.

Potassium bromide i oz. 63 grs.. . 36 grm.

Citric acid 400 grs 28 grm.

Potassium metabisulphite ... 2 ozs 60 gm.

When in use, temperature of developer should be maintained
at 65* F. When development is complete, rinse film in two
changes of water and fix in an acid fixing bath.

Although there are reasons against the use of the same de-
veloper for negatives and positives, the following is capable of
yielding most satisfactory resuhs for both, and is recommended
for use where the number of developing tanks is limited.

3G9

Me3xil-Hydroquinone Developer

Water i8o gals.

Hydroquinone S lbs.

Sodium sulphite (anhydrous) 40 lbs.

Sodium carbonate 22 lbs.

Potassium bromide i^y lbs.

Potassium mctabisulphite 2 lbs.

Metol 8 ozs.

Gtric acid 10 ozs.

The following is slower in action :

W'ater lOo gals,

Hydroquinone 8 lbs.

Sodium sulphite (anhydrous) 25 lbs.

Sodium carbonate 25 lbs.

^B Potassium bromide I lb.

Care must be taken to have temperature 65" to 70" F. as hydro-
quinone docs not work well bcluw 65^ and is too contrasly above

^B Edinot — Hydro Developer for negatives only

^^^ Water 160 gals.

^^^ft Acetone sulphite 6 lbs.

^^^H Sodium sulphite (anhydrous) 24 lbs.

^H Edinol 2>^ lbs.

^^^K Hydroquinone ij/i lbs.

^^^B Potassium bromide i lb.

^^^H Potassium carbonate 40 lbs.

^^^Note — This is an excellent developer for Negatives, Films or
^ft Plates, butt not suitable for Positives.

■ G

.A Gr.YciN Developer

Glycin is slow acting developer which keeps for a long time
and >'ields negatives perfectly free from stain. It also makes an
excellent positive developer giving a rich blue black print and
when rc-developed gives very pleasing sepia tones. Its keeping
qualities and close grained deposit recommend it especially for
those whose work is on small quantities and infrequent. When
exhausted it becomes strongly fluorescent showing a bluish cast
like kerosene and should then be thrown away.

363

MOTION PICTURE PHOTOGRAPHY

Try the foUowiog formula and if yoM find it satisfactory you
can easily calculate for larger quantities:

Glycin a ozs.

Sodium sulphite 5 ozs.

Potassium carbonate 10 ozs.

Water I gal.

Metol Substitutes

^fetol is the trade name of a German-made developing agent
which was in extensive use in this country before the War.
Genuine Metol has been practically unobtainable since the first
year of the war and yet the name had become so firmly rooted
that it is still used as a designation for any one of a ntimber
of developing agents of similar properties which may be sub-
stituted for it in the preparation of developing solutions.

The names of some of them are as follows: Monomet. EImi,
Kodalon, Phcnomct, Paramidophenol, Ardd, Wallace's "Metol,"
Cooplol, Rhodol, etc., any of which may be substituted for metol
in any developer formula. Most of them may be substituted in
equal quantities, those which require more or less so state on
the sheet of directions accompanying them.

Motion Picture Negative Developer

Water ...160 gal I gaL

Metol 12 oz I J4 dr.

Hydroquinone 3 lbs 4^^ dr.

Sodium sulphite (anhydrous).. 30 lbs 3 oz.

Sodium carbonate (anhydrous) - 10 lbs I oz.

Potassium bromide 8 oz, ^ dr.

Citric acid i lb i>4 dr.

Positive Developer

Water 200 gal I gal,

Paramidophenol sulphate I2 oz x dr.

Hydroquinone 27 oz 2J4 dr.

Sodium sulphite (anhydrous).. 28 lbs 2l4 oz.

Sodium carbonate (anhydrous). 24 lbs l^ oz.

Potassium broTTu'dc 10 oz 22 gr.

Sodium hydroxide 4 lbs. ^yi dr.

APPENDIX

Fixing Bath

While the ordinary plain "Hypo" of two pounds of hypo
per gallon of water seems all that may be desired, yet there are
times and conditions where it fails, particularly in hot weather.
The following mixture (for all times) on account of its un-
faihng certainty even under the most trying conditions is
recommended.

Acid Hypo Fixing Bath

Avoir, Metric

Water lo gals 40 1.

Hyposulphite of soda. .21 lbs 10 kg.

Wlicn thoroughly dissolved, add the following hardener :

Water 40 oz 1200 c.c.

Sodium sulphite (des). 4 oz 120 gms.

Alum 8 02 240 gms.

Acetic acid 28% 24 oz 720 cc.

When fixing is complete, wash thoroughly and immerse for
two minutes in the following:

Glycerine Bath

Avoir. Metric

Water 10 gals 40 I.

Glycerine 32 liq. 02 i 1.

The object of the glycerine bath is to maintain flexibility in
the film.

Another Acid Fixing Bath

Mix in the order given.

Water 250 gals.

Hyposulphite of soda (crystals) 400 lbs.

Sodium sulphite (anhydrous) 25 lbs.

Acetic acid No. 8 (>^ carboyer) 50 lbs.

Powdered alum V/i lbs.

fJote — Remove "scum" before using. Where mixing facilities
permit, it is better lo mix the last three ingredients separately
in 10 gallons of the water and decant or filter into the hypo after
settling.

365

MOTION PICTURE PHOTOGRAPHY

INTEXSIFIERS
Silver Cyanide Intensifier

In cartoon and title work where intense contrast is wanted
between black and white, an intensifier is often wanted that will
give an unusual degree of intensification. Such an intensifier may
be made as follows :

Sol. A,

Bromide of Potassium I tb.

bichloride of mefx:ury i tb.

Water lo gals.

Sol. B.

Pure cyanide of potassium I lb.

Nitrate of silver i lb.

Water lo gals.

Place the film to be intensified in Sol. A until the image has
bleached clear through to the back of the film, then rinse well
and transfer to Sol. 13.

Note — These solutions are highly poisonous.

One immersion gives a heavy degree of intensification but if a
greater degree is re<iuired the operation may be repeated.

Intensification p-y Toning

A very considerable degree of intensification may be given a
negative by toning it septa in the same bath that is used for
tonitig sepia positives, l-'ull directions are given in the chapter
on Tinting and Toning.

Iodide of Mercury Intensifying Formula
Note — This solution is poisonous and should be labeled
"POISON."

This method is more regular than bichloride of mercury and
has the faculty of reducing contrasts in addition to intensifying
the general image.

Water • loo gals.

Sulphite of soda (anhyd.) 83 lbs.

Iodide of mercury .... * 854 lbs.

Submerge the frame of film in this solution and allow to re-
main therein until the desired strength has been obtained, then

366

wash in running water for at least 15 minutes and place in the
re^Iar develojicr for from 3 to 5 minutes, after which it should
be washed again for 30 minutes.

REDUCTION OF MOTION PICTURE NEGATIVES

PERSULFHATE ReDUCER

This formula is advised, where the film is very contrasiy for
it has the faculty of reducing ihe dense portions of the negatives
without any material change in the high lights or thinner por-
tions. Place the wet film in solution No. i which is made up of:

Water 100 gals.

Persulphate of ammonium 33^.1 lbs.

As soon as ihc right density has been obtained place the film
in solution No. 2 which consists of :

Sulphite soda , 10 lbs.

Water 100 gals.

This will stop the reduction immediately after which film
should be washed for from 15 to 20 minutes in running water
and then dried as usual.

Ferrichloride Reducer

This is an efficient method of reduction. It has been found of
particular value in reducing high lights at a greater speed than
shadows thereby overcoming extreme contrast.

Ferrichloride I dr.

Hydrochloric acid 2 dr.

Water 10 oz.

The negative to be reduced is first thoroughly washed until the
last traces of hypo are eliminated. It is then immersed in the
reducer for a minute or so. On taking the negative out from this
solution, no action will be apparent, but on transferring it to a
freshly mixed hypo bath, reduction will take place very quickly.
The operation should be carefully watched, being stepped a little
short of completion.

FERRicy.^NiDE OR F.\rmer's Reducer

This reducer acts differently than those given above as it in-
creases contrast by attacking the shadows more than the high

367

MOTION PICTURE PHOTOGRAPHY

lights. It must be freshly prepared as it deteriorates rapidly.

To prepare it, take as much fresh hypo solution as is required
to cover the fihii and add to it enough of a saturated solution of
potassium fcrricyanide to make it lemon colored. If the color
is too deep, verging on the orange, the reduction may proceed
too rapidly to be controlled. When reduction has proceeded far
enough, wash quickly to prevent further action.

Dye-Toning Positives

Dye-toning is different from cither toning or tinting in that a.
dye image is substituted for the silver one.

The dyes used for tinting film arc not suitable for this process
as only certain basic dyes may be used. The process is based
on the discovery tliat silver iodide acts as a mordant for certain
dyes.

To convert the silver image to silver iodide it is first immersed
in the following solution :

Sol. A. — In four quarts of water dissolve 7 pounds of potas-
sium iodide. In this iodide solution dissolve 3 pounds of iodine
scales and then add to it :;i2 gallons of water for one rack lank.

In this bath the film must remain until the image has bleached
to a pale straw color, when it is removed and washed, tbea
placed in one of the (ollr>wing solutions:

Green fMalachitc Green i lb. 2 oz.

[Water 32 gals.

Blue

/Victoria Blue 3 oz.

*! Water 32 gals.

TAuramine 2 lbs.

Yellow -i Saffraiiine 7 dr.

IWater 32 gals.

fPonceau Red 2 lbs.

\Water 32 gals.

... I lb. 12 oz.
.,.32 gals.

fVioIet de Paris 4J4 oz.

\Water 32 gals.

Red

Orange JAcridine Orange

^ \Water

Violet

368

APPENDIX

The iodized film is allowed to remain in the dye balh until the
image is saturated with color to the back of the film. It is then
removed and the high lights cleared by immersion in :

rClacial acetic acid x lb. 6 oz,

Bath B i Denatured alcohol 5 lb.

(^ Water ^2 g^l-

Tlie next step is the removal of the iodized silver which may
be done in the following bath:

BathC.

Hypo 15 lbs.

Sodivim acetate 10 lbs.

Tannin 10 lbs.

Water 32 gals.

After clearing, the film is washed and dried.

Balh C is not absolutely necessary if the film is simply dye
toned to obtain a pleasing color but for color photography where
a transi^arent image is required Bath C must be used.

Concentrated DEVELorER for Gasught Papers

Metol J4 oz.

Sodium sulphite ( Anhyd.) I lb.

Sodium carbonate (Anhyd.) la oz.

Hydroquinone 2 oz.

Potassttjm bromide % oz.

Water I gal.

'For use, dilute with four parts of water.

760

Bahanu Islands 310

Balloon pholography 305

Bangs, Frank, 335

Barrel Distortion of lens 73

Bartsch, Dr. Paul, 313

Basic d>'es 191

Bath, Toning, 17B

Bausch & Lomb 79, 268

Baynes, G. McL., 224

Beards, false, 316

Bell & Howell movement 60

Bell & Howell Printer, operation

of 173
Bibliosraphy 334
Biggs, Alfred, 5
Binocular mask 270
Biograph Studio 22J
Black Maria 228
Black matte varnish 357
Black smoke 278
Bleeding 192
Blue tone 187
Box sets 316
Brass, to blacken, 3S9
Breaker-box 172

British Journal of Photography BB
Brittleness 191
Bromides 116
Bromine ^'apo^ 81
Brown red tone 181
Buckling 94
Bunsen burner 28
Burrough & Wellcome Meter 213

Calibrated lens mount 76

Calibrating lens mount 77

Calibration of mixing vessels 108

Cam, Harmonic cam movement, di-
agram of Universal, H

Camera angle ZZrt

Omera, cartoon, 264

Camera, choice of. 60

Camera, focusing of, 76

Cameras, magazines side by side. 62

Camera mount, airplane, 308

Camera, oil for, 94

Camera. Pathe Freres amateur
model, 58

Camera repair 93

Camera, still, 96

^mera, threading of, 63

Camera, toy motion picture, 60

Cameraman's assistant 95

Camerarnan's relationship to other
workers 320

Camp-fire effects at night 280
Captions 201
Carbons, arc, 231
Carborundum powder 90
Carboy, glass. 139
Carelessness 326
Carew, Edwin, 204
Carnegie, Douglas, 90
Carpenters, stage, 321
Cartoons, Animated, 12
Cartoons, animated. 257
Cartoon board 260
Cartoon Camera 264
Cams, Titus Lucretius, 7
Cavern effect 270
Celluloid 12

Celluloid for cartoons 261
Centigrade thermometer 114, 360
Changing bag 94
Changing focus 77
Characteristic curve 149. ISO
Chart, focusing. 208
Chart, Lens testing, 79
Chemical definitions 100
Chemicals, dcssicatcd, 116
Chemical fog 114, 113
Chemical Impurities 129, 130
Chemical rays 46, 73
Chemical reactions 100
Chemical solutions 100
Chemicals, storage of. 130
Chemicals, substitution of, 122
Chemistry, Photographic, 340
Chevrcul's black 35
Chiaro oscuro 299
Chicago Stage Lamp 232
Chromatic aberration 72, 73
Chromium focusing screen 89
Chronomatograph 9
Chronophotographoscopc 9
Choice of camera 60
Cigarette smoking 320
Cinching up 163
Cmematographer's duties 92
Cinematographic Literature 334
Cinematography, Books on, 341
Cinematography, Fascination of, 19
Cinematagraphy, History of, T
Cinematograph leases 64
Circle-in 268

Circle of confusion 40, 68
Circle-out, Length of, 269
Circle-out 268
Citric Acid 120
Clarke. H. T., 129
Claw, slip claw movement, 68
Close-up, dissolve into a. 277

STl

^^^^^^r Cloud photography 294

de Abney, Sir W. W.. SI ^H

^^^^^^1 Climbing side of building, man, 27B

De Brie camera Double loop OS ^^H

^^^^^^m Cockpit, airplane, 305

De Brie camera, focasin^ device of, 1

^^^^^^H Coins as wciKhls 355

86 ■

^^^^H Cuiby. Vincent, 260

De Brie movement S9 1

^^^^H Colloidal salts

Dc Brie type of focu&ing s'u* ^ ■

^^^^^^1 Color screens

Decabo 129 ^H

^^^^^H Color tinting

Decanting 110 ^^M

^^^^^H Color

Decorative design 288 ^^H

^^^^^^H Coma lens

Decorative titles lii9 ^^H

^^^^^H Commercial Studios 1132

Decoudin's Exposure Meter 214 ^^H

^^^^^H Comniittee on Public Information 10

Detinitions, chemical, 100 ^^H

^^^^^H Compass

Detlnition of lens 73 ^^H

^^^^^H Composition 2S8

Deltqncsrence 131 ^^H

^^^^^^^ Concave lens 48

DeMillc. Cecil B^ 243 ^H

^^^^^^1 Concavo-convex tens 4S

Density ^^H

^^^^^^m Concentrated developrrs 117

IVnsily ratios 150 ^^H

^^^^^H Concent rat cJ paper developer 369

Depth of tield 360 ^^M

^^^^^H Conduct, cameraman's. 3•^h

Depth of focus 67. 68, 69. S3 ^H

^^^^^B Confidence 327

I!>e8<icatcd chemicals 116 ^^H

^^^^^H Confusion, circle of, 40. Q8

Develope, How to. 157 ^^H

^^^^^H Conjugate

Developer, combmrd, 363 ^^M

^^^^^^H Conjugate foci, determination of ■ 51

Developer, concentrated, 117 ^^H

^^^^^H Contact printing- 167

Developer, Edinol. 303 ^^H

^^^^^H C6ntinuou5 printer l^fi, 171

Developer for paper 360 ^^H

^^^^^H Contrast developer 348

Developer for contrast 348 ^^H

^^^^^1 Contrast

Developer for M. P. n^ativcs 117 V

^^^^H Contrast factor 157

Developer formula 116 ^^J

^^^^H Control card 170

Developer, Glycin, 363 ^^B

^^^^^H Con^Trsion of Pormulx 102

Developer, M-Q. 363 ^^M

^^^^^1 Cooper- Hewitt Lamp 28. 221

Developer, negative, 364 ^^H

^^^^^H Coopcr-HcwiU quartz lights 311

Developer, positive. 364 ^^H

^^^^^H Cooptol developer 364

Developing racks 1S8 ^^H

^^^^^1 Copper ferrocyanidc 177

Developer. Tropical, 353 ^^H

^^^^^H Corrected tens

Developer, two-solution, 118 ^^H

^^^^^^1 Correct expov^ure 140, in3

l>vcloping agents 114 ■

^^^^^H Correct develnpment

Developing, instructions for Spiral ^^B

^^^^^H Counting for Double Kxposurcs 271

Reel, 140 ^H

^^^^^H Covering Potrer of Lens 74

Developing outfil. portable, 355 ^^M

^^^^H Crabtree. J. T.,

Developing outfits. Spiral Reel, 140

^^^^^1 Crank turners

Developing rack. How to Make. 136

^^^^^H Crepe

Developing solutions, to mix. 114

^^^^^H Crookes tubes 81

Developing test in double exposure

^^^^^H Cross

work 274

^^^^^H Croy, Homer,

Developing tray, How to Make. 137

^^^^H Curtis. Edward S.. 325

Developing troubles 118

^^^^H

Development, cfirrect. Ill

^^^^H Cut-outs. Cartonn, 263

Development, Drum system of, 133

^^^^^H Cutting and editing 109

Development, Gaumont Co. Ma-

^^^^^H Curvature of field of lens 71

chine. 134

^^^^^B

Development, Machine, 134

^^^1

Development Machine by Path^

^^^^^^H

Co.. 134 m

^^^^^1 Darlc room 96

Development of the negative 133 ^^M

^^^^^1 Dark room lights 33

Development. Spiral Reel for, 139 ^^

^^^^^1 Dark tent

Diagrams, Animated, 2S7 m

^^^^^V Day's work, Preparation for, 9i

Diaphragm 40, 208, 2G9 ^^M

^^^^B ^H

^^^ Diaphragm, Effect of, 41

Drying film 139 ^^^^^^^H

H Diaphragm numbers 216

Dual roles, photographing, 279 ^^^^

H Dichroic fog 184

Duplex Arc Z-amps 235 ^^H

■ Diffused light 36, 37

Duplex Printer, Operation of the. H

■ Di£Fusers 37

171 ^^M

H I>iIution of liquids 107

Threading, 171 ^^^H

■ Director 320

D>'es, Manufacturers of, 194 ^^^|

H Director, Conferring with, 03

Dye-Toning 368 ^^H

■ Director, Ketations to, 97

^^^^H

H Direct positives 347

■ Dirty lilm 163

^^^H

H Discoloration of film 163

Earthenware for solutions 108 ^^^|

H Dispersion 34

Eastman, Geo., 13 ^^^H

H Dispersion, Correction of, 4S

Eastman negative stock 133 ^^^H

H Dispersion of light 44

Eder's Handbook '£lii ^^H

■ Dissolve S76

Hdiscii, Thos. A^ 11 ^^^|

H Dissolve, Automatic, 60

Edinol developer 363 ^^^H

■ Dissolve, Hand, GO

Editing film 199 ^^H

^M into a close-up, S77

Educational films 20 ^^^|

■ shutter. 60

EdiKUtional Pictures S47 ^^^|

H Dissolving chemicals 109

EfTcctive aperture 66 ^^^|

H Distortion, Barrel, 72

Efflorescence 131 ^^^|

■ of lens, 73

Electrician 320 ^^H

■ Pillow, 73

Elementary photography 335 ^^^|

H Diveneins lenses 48

^M Diving chamber. Photographic, 310

Elon 100, 114 ^^H

Elan developer 364 ^^^|

^K deep sea, 311

Employees 324 ^^^H

^P Donisthorpc, Wordsworth, 13

Employer 334 ^^H

^F Double concave lens 4S

Emulsion 158 ^^^B

H convex lens 49

English Arc Lamps 235 ■

^L Exposure, Counting for, 271

English Weights and Measures 354 ^^M

^m Exposure on dual roles ST9

Equivalent focal Irngth 64 ^^^^

^^^^ Exposure work. Developing

^^^H

^^^B test

Ernemann movement 59 ^^^|

^^^H Exposure, Marking film
^^H tor. 271

Errors. Zonal, 70 ^^^H

Ether 25 ^^^H

^^^H Exposure, Trick-Work

Evans. M., ^^^H

^^^H

Experience 329 ^^^H

^^^H Exposure work, tnarkint

Exposure 140, 159, 208 ^^H

^^^H groundglass in, S72

Exposure chart 216 ^^^H

^^^^L Exposure work. Record on

Extension ring 79 ^^^|

^^^■^ film, 275

Exterior lighting 206 ^^H

^T Double loop, Dc Brie camera. 63

Extras 323 ^^H

^^^_^ Newman & Sinclair

Eye piece 41 ^^^H

^^^fa Camera.

^^^H

^^^T Pathd Portab^i?, 62

^f Double Printing 2^3

^^^H

^P Dramatic pictures 19

Facination of Cinematography 19 ^^^^

■ Drawings for Animated Cartoons

Factors, exposure, 211, 303 ^^H

■ 258

Fade 2CS ^^M

■ Driffield, V. C, 210

Fade-in 60, 207 ^^M

■ Drops 105

Fade-out GO, 267 ^^H

^m Drum system 134

Fades, length of, 268 ^^H

H Drum system 190

Fahrenheit thermometer 114, 360 ^^^M

^P Drums, drying. 139

Fake ^^H

^B Drunken screw &9

Fancy masks 270 ^^^H

^1 Drying drums 139

Farmer's Reducer 267 ^^H

i 1

^^^^^^ Faucets

screens, fine. 90

^^^^^H Ferrichloride Reducer 307

How to make

^^^^^B Ferrocyanide Copper 180

iodide 89

^^^^H Iron 1S3

screen. How to make, to

^^^H 178

avoid trouble of accom-

^^^^^H Uranium

modation, 90, 91

^^^^H Vanadium 104

Tape line measurement

^^^^^H Ferricyanide Reducer 367

for, 76

^^^^^1 Field, Curvature of, 71

the Camera 76

^^^^^B Film, Drying, 139

To make tilm for, 88

^^^^^1 Film for focusing, To make, 88

tube. Microscopic, 84

^^^^^H ground

Fog 70. 160

^^^^^H Film-notching device 173

Chemical, 114, 118

^^^^^1 Film, Slitting, 15

^^^^^H F'ilm stock, Eastman negative. 135

Fogging 179

Formaldehyde 353

^^^^^^K unperforated, IS

Foreground 290

^^^^1 X-back, 03

Formula:; How to use, 100

^^^^^H Filter bags

Formulas, Sec Appendix

^^^^^H Filtering solutions 110

Formalin 197

^^^■^ Filters

F System 67

^^^^B Light. 301

Frame line 170

^^^^^B Fine focusing screens 90

Free lance cameramen 22

^^^^^H Finger marks 163

Frilling 161

^^^B Finish. Black Matte. 3fi7

Fringe, Prismatic. 42, 49
Fosdage 30

^^^^B Fish, Deep sea. 31S

^^^^^B Fixing bath 365

^^^^^H

^^^^H Ftame arcs

^^^^^fl Flare spots

^^^^^H Flexible support 12

Galbraith. Frank. 23

^^^^^H Floor covering 310

Gaumont Company machine dr-

^^^^^H Fluid measure 3M

vclupmcnt 134

^^^^H Flying outfit 300

Geisslcr tube 14

^^^^^H Focal length, Equivalent. 64

Geneva movement 67

^^^^^fl lens 64

Genthc. Arnold, 335

^^^^H plane

Getthcmoneygraph 9

^^^^^1 point 40, 64

Ghost or spirit ttgures 2S1

^^^^^H Focus, Back, 04

Gillies, John, 325

^^^^^1 Changing of, 77
^^^^B Depth of, 67, 68, G9. S3

Gillon camera. Threading. CS

Gillon movemem S7, 50

^^^^^B Equivalent, 68

Gimbal panorama 77

^^^^m 84

Glacial acetic add 121

^^^^^H Focusing

Glass carboy 139

^^^^^1 Achromatic loups for, 87

Glass disk 9

^^^^H

Glass graduates 100

^^^^^B

Glass, Ground. 84

^^^^^H device of Dc Brie camera

Glass ink 357

^^^H

plates 9, 18

^^^^H dodge for

studios 221

^^^^H gUss, De Brie type of. 67
^^^^^B loup

Gloss, To kill, 319

Glycerine bath 133, 180, 197, 365

^^^^^H magnifier 207

Glycin Developer 363

^^^^^B

Goerr, C. P., American Opikal Co.,

^^^^^B mount. Backlash of, 78

268

^^^^H scale

Goggles 309

^^^^^H screen, Chromium, 89

Goodwin, Rev. Hannibal, 18

^^^^^H screen. How to make

Gosport 30S

^^^^H

Government films 20

^^^^1

B^w

^Gradation IM, 295

■

Hurter and Driffiek) 141. 144, 150 ^^^^^B

Graduates, Glass, 109

Hurter, F., 210 ^^^1

Granulanty i6i

Hydrochloric acid 120 ^^^^|

Grease paint 31S

Hydrolysis 192 ^^^H

Grtene, W. Fricie, 13

Hydrometer tests 105 ^^^H

Green blue tone 2SS

Hydroquinone 114 ^^^^|

Green tone 184

develo]>er 3ft3 ^^^^|

Griffith. D. \V., 204

Hypo, Acid, 119 ^^^1

Qriad'mg the backs of lantern

Bath 3S5 ^^^1

slides 88

How made, 119 ^^^^|

Ground glass or fiJm 84

Milky, 120 ^^^M

Gun, Photographic, ll

Solution 101. 119 ^^^H

Tropical, 353 ^^^1

I^^Hadden-Smith, Gov.. 311

^^M

Halation IM, 230

Jllumination 32 ^^^H

Halftone dots 4:1

lens ^^^H

Halo 7l>

Illustration or picture brought to ^^^H

Handbooks 330

^^^H

Hand dissolve 60

Image, Aerial, 83. 84 ^^^H

Hardener, Acid, 119

Circle 65 ^^^^1

Hardening Bath 363

Color. 177 ^^H

Hard lights 2:*3

^^^H

rubber racks 179

Production of, 43 ^^^^|

r Hannanic cam niovemenl 3G, 27

43 ^^^M

diagram of

Virtual, ^^^H

■

Universal,

Impressionism 295 ^^^^|

Impurities in chemicals 120 ^^^^|

Haughton, Percy, 23

In and out movement 58, 59 ^^^^|

Harvey Meter 213

Incandescent lamps 23 ^^^^|

Heat, radiant, 81

Ince, Thomas, £i>4 ^^^H

Hepworth Film Co. 224

index of refraction 38 ^^^H

Herschcl, Sir John, 9

Industrial films 20 ^^^H

Hertzian waves 26

pictures 247, 333 ^^^^|

Heyde's Exposure Meter 215

Infallible Exposure Meter 213 ^^^^|

High lights 304

Infra-red rays 30, 81 ^^^^|

Hinton. A. Horslcy. 209

Ink for glass 357 ^^^H

Historical Pictures 247

Instructional films 20 ^^^H

History of Cinematography 7

Intensification by toning 178 ^^^H

Hoechst dyes 194

IntensiRers 366 ^^^^|

Hoffman, Chas. W, 5

Intensity of light 31 ^^^H

Hood. lens. 269

Interior liKhtiiiK 220 ^^^^M

Hop wood, Hctrfy v., 6

Interpretation of ideas 325 ^^^^|

Horizon line 203

Introduction S ^^^^|

Homer, W. G., 7

Inversion of image 43 ^^^H

How Submarine Movies are made

Invisible light 30 ^^^^|

1 310

Invisible rays 81 ^^^^|

^K How to make developing rack 136

Iodide in developer llS ^^^H

^^1

tray 137

Iodide focusijig scrrrns. How to ^^^^|

^^K focusing screen to

make. ^^^H

^^^ avoid trouble of ac-

Iron fcrrocyanide 177 ^^^^|

^^^^^ commodation 90-91

^^^^H

^^^^B novel focusing screen

f Hoyt. Dudley. 325

Japanese art 292 ^^^^|

^^ Huntington, R. J., S

Jenkins, C. Franris, &, 9 ^^^^M

375 S

^^^^^^^^^ Johns Hopkins University SI

43 ^^^^^^^^H

^^^^^H Johnstone, Francis B.. 325

Rectilinear. 73 ^^^^^H

^^^^^^1 Joyce Hame arc

Speed of. 64 ^^^^^|

^^^^^^1 Judgmcat, Cincmatograpber's, 93

Wide angle. S5 ^^H

^^^^^^H

Leventhal, J. K, 262 ^H

^^^B

Lewis. Edgar. 204 ^^H

Light, Actinic value of. 33 ^^H

^^^^H KaIIc dyes

Hooks on, 339 ^^M

^^^^^^B Knsebler, Gertrude, 335

card ^^M

^^^^H Keyholes 261)

change 175 ^^M

^^^^^H Kincmatograph Meter 213

automatic, 173 ^^|

^^^^^^H Kineto&cope 17

Light-changing mechanism 171 ^^M

^^^^H KUeglight S3Z

movement 1 72 ^^H

^^^^H Kiieghght Portable 234

Light dispersion 44 ^^H

^^^^^^1 Kodak portrait lens 79

Intensity of, 31 ^^H

^^^^^H Kodalon developer 304

Light intensity 143 ^^H

^^^^^H

Light path 27 ^^H

^^^H

ray ^^H

shift ^H

^^^^^H lacquer for metal

the nature of, SS ^^H

^^^^^H Landscape photography S88

variation table 211, SS7 ^^M

^^^^^H Lantern Sliilcs

Velocity of, 30 ^^M

^^^^^H Lantern slides, Grinding the bac^s

waves 26 ^^M

^^^^H 68

waves, length of, 30 ^^M

^^^^^H Latent imnge

Wave length of 80 ^^B

^^^^^H lateral shrinkage, Taking care o{

Lighting, Artificial, 220 ■

^^^^^^P Latitude of emulsions 310

diagram 239. S43. S44. £45 I

^^^^^^B exposure

Interior, 220 1

^^^^H fihn

Lightning striking ~H5 ^^J
Life of Toning balh ISO ^^H

^^^^^^H Law of inverse squares 31

^^^^^H Learning photography 96

Line composition Z\il ^^H

^^^^^H Length, luiuivalent focal. B4

Lip rouge 316 ^^H

^^^^^M Lens, Axis

Liq\iids, Dilution of, 107 ^^H

^^^^^H Lens, Coma of.

LiQiiid measure 3S4 ^^^|

^^^^^^H Corrected,

Lithographic process 43 ^^H

^^^^^^1 Covering Power of.

Liver of sulphur 3&i ^^H

^^^^^^B Curvature of field of, 71

Loading retorts 94 ^^H

^^^^^^1 Definition

Local color 247 ^^^|

^^^^^^1 Focal length of,

Locations 95 ^^H

^^^^^^1 Focal point of, 64

Loop, true or return. 62 ^^H

^^^^^^1 Forms

Lumiere^arpentier Slovement A6 ■

^^^^^1

Lumiere movement 56 ^^H

^^^^^^m Illumination

Luminosity, visual, 143 ^^H

^^^^^H Kodak Portrait,

lAiminous point 29 ^^H

^^^^^^H Magnifying,

^^H

^^^^^H Mount, Calibrated, 7a

^^^^^^K Mount, Calibrating, 77

^^^^^^B Photographic,

Nfacbeth Lamps 233 |^^|

^^^^^^1 Supplementary, 79

Machine development 134 ^^B

^^^^H Tessar, 70

Machine development. Path^ Com* ■

^^^^^H

pany, 134 ^^fl

^^^^^H unsymmetrical combination.

Machine development, Gamnoot ^^M

^^^^H

Company. 134 ^^H

^^^^^H Lenses

Magazines side by side A3 ^^H

^^^^^^ Books on 340

Magnesium torches S6S ^^H

^^^^^^ft Cinematograph, 64

Ma^iifying Lens 46 ^^H

^^^^^1 Negative,

Majestic lamps 223 ^^H

^^^H ^1

i^ ^

W Major conjugate 50

Calibrated ^^^^^^^^H

■ Make-up 230

Calibrating a lens. 77 ^^^^^H

I Make-ut> for niuvies 315

Movement, BelJ & Howell. 60 ^^^^1

m Making motion picture positives 1G5

De Brie, 59 ^^1

^^^ Making Submarine Movies 310

Ernemann. 59 ^^H

^^^P Maltese Cross movemcut 57

Geneva, ^^^|

^^■^ Manager. Studio, 323

Harmonic cam. 56, 57 ^^^|

Marey, E. J., 11

in and out« 5S. 59 ^^^|

Marking film for double exposure

Lumiere. ^^H

S7a

Lumierc-Carpentier, TiA ^^H

groundglass in double ex-

Maltese Cross, 57 ^^H

posure work mz

Pathc, 57 ^^1

Markings on film 163

Patlie Freres, 58 ^^1

Martin, Julius, Ifll

Pittman, 5S ^^H

Masks 369

Prcvost, 57, 50 ^^1

fancy, »70

Rod and crank,57,5S,SO ^^H

Matt celluloid 80

Sli^ claw, 58 ^^M
Universal. 57 ^^H

Mayers, Max, 299
McDonald, Pirie. 325

Williamson. 5S ^^H

McKay. Winsor, 257

M. Q. Developer 303 ^^H

Measuring chemicals 100

Munsterbcrg, Hugo, 224 ^^H

Meniscus lens 49

Muybridge, Ed., 8 ^^H

Merck chemicals 185

Mustaches, false, 316 ^^H

Mercury Intcnsifier 366

Metal-coated carbons 338

^^H

Metal Lacquer 359

^^H

McUl trays 139

Navy Films 10 ^^H

Meter. Harvey, 212

Negative, Development of the, 133 ^^H

Method of focusing 90

lenses ^^H

Metol substitutes 3C4

Overexposed, 141 ^^H

Metric system lOi

Perfect. 144 ^H

Mcycrowitz, K. B.. 208

Underexposed. 141 ^^H

Microscope eye-piece 80

thin, 160 ^^M

Microscopic focusing tube 84

weak, 100 ^^H

pictures 250

Newman 286 ^^M

Milky hypo 120

Newman & Sinclair camera doubt* ^^H

Miniatures 27S

loop 62 ^^H

Alinor conjufcate 50

News films 21 ^^H

Mirrors, silvering. 359

Newspaper photographers SO ^^H

Mirror, vision in a. 281

Newscamcramen 06 ^^^|

Miscellaneous solutions 133

Nitrosodtmcthyl aniline 83 ^^H

Mixing acid hardener 120

Nodal points 48 ^^^|

Mixing developer 114

Notch, light change. 175 ^^H

tanks 110

Novel focusing Kreen, how to ^^H

vessels lOS

make. 90 ^^H

Money with your camera 331

N. V. Institate of Photography & ^^M

Monomet developer 304

^^^H

Mosstype 42

Motion analysts S, 23

^^^H

Motion Picture Camera, The. 53

Objective 44 ^^H

Engineers, Society

Oblique rays 47 ^^H

of. 223

Ocular focus 84 ^^H

Motion Study 252

Synthesis of, 8

Oil for cameras 94 ^^H

Olive green lone 187 ^^^|

Mott. Wm. Roy, 223

One-solution tone 177 ^^H

Mottled film ifil

Opacities, Range of, 149 ^^H

Mount. Bladclash of focasing. 78

Opacity 145. 160 ^^M

derating motton-ptcUtre machines

342
Operation of the Bell & Howell

Printer 173
Operation of the Duplex Printer 171
Optical Axis 64
Optical center 48
flat 83

Lanterns 33a
Optics, Books on, 339

Photographic, 44
Orthochromatism 3U0
Orihochroniatic film 230
Outfit, camera. 206
Overexposed Negative 141
Overhead lights 322
Oxidation of solutiont 111

Painted scenery 240
Paint, Probus, 137
Panchromatic film 130. 300
Panorama, gimbal, 77
Paper developer 309

Paramidophenol 111
Paramidophenol developer 3C4
Parts, solutions by, IW
Pathe Company machine develop-
ment 134
Fath6 Fr^rcs amateur model camera

58
Path6 movement 67, 59
Pathe Portable camera Double

Loop 62
Pathi, retorts B4
Pedagogical pictures 247
Peep show 17
Percentage solutions 103
Perfect negative 144
Persistance of vision 7
Personality 325
Perspective 292
Perspective, Exaggerated. 65
Persulphate reducer 367
Phantasmagoria 9
Phantoscope 16
Phenomet developer 3G4
Phonograph 11
Phosi>horcscencc 28
Photogelatinc process 42
Photographic arithmetic 107

books 96

gun 11

objective 47

optics 48

solutions. How to
prepare, 100

Photographing dual roles 279
Photography, Astronomical. 46

Books on. 33&
Photokinematoscope 9
Photomechanical reproduction 42
Photometer 146. 209
Photo -micrographic motion pictures

86
Physics 25
Pictorial unity 290
Picture brought to lite 283
Pillow Distortion 72
Pilot, Airplane, 306
Pinch cock 113
Pinhole <0
Pitted emulsion 163
Pittman movement 58
Plano-concave lens 48
Plano-convex lens 48
Point of focus 31)
Palish for cameras 358
Pop-eyes 317

Portable developing outfit S3S
Portrait lens, Kodak, 79
Position, Applying for, 328
Positive developer 3G3

lenses 48

printing 105

stock lfi6
Positives direct 347
Posterior conjugate 50
Potassium salts 123
Power of lens. Cover, 74
Precipitating tanks 351
Prcparaliiin fur work B3
Prevost camera 03
Frevost camera. Threading of, fit
Prevost movement 5T, 59
Preservative 114
Primary colors 34
Principal axis 48
Principal fncus 4B
Prism 34, 38
Prismatic fringe 45
Prism Glass 228
Printer, Continuous, 171

Operation of Bell &
Howell, 173

Operation of the Duplex
171

Step. 171

Threading Duplex. 171
Printing contact 167

Double, 283

leader 170

light 160

machine 165

378

Positives 1G5

Relations to director 97 ^^^|

Rolls 170

Relative aperture 66 ^^^|

Probus;»int 137

Rembrandt 295 ^^^|

Profession of Cinematography 324

Rembrandt lighting 226 ^^^|
Research Laboratory of Eastman ^^H

Projection. Books on. 330

Projector. Toy, 60

Kodak Company 100 ^^^H

Promotion 96

Restrainer 114 ^^M

Propaganda films 19

Retorts, Loading, 94 ^^^|

Propagation of light 29

Return or true loop 63 ^^H

Props 321

Reversal 147 ^^M

Ptolemy 7

Reverse take-up S71 ^^H

PoHAcation of water 128

Reversing solution 348. 3S0 ^^H

Pyro 114

Rheostat, Light change ITS ^^H

Rbodol developer 364 ^^^|

Ring, Extcnstun, 79 ^^^|
Rode Crystal 81 ^^M

Quaru 81

Rod and crank movement 57. 68. 59 ^^H

Roskam. Ed. J., s ^^M

Rouge in make-up 23U ^^^|

Race trade B

Royal Photosispbic Society 67 ^^^|

Rack, How to make developing 136

^^1

Developing, 158

^^H

Radiant heat &i

Salary 328 ^^M

Radiographer 81

Salts, Anhydrous, 110 ^^H

kaif & Gammon 16

Saturation 101 ^^^|

Range of exposure 1S3

San Salvador 310 ^^^|

Opacities 149

Sarony, Napoleon. 325 ^^^|

Rays, Actinic. BO, 8i

Scale for focusing 76 ^^H

K Axial, 47

Scale of gradation 296

H Chemical or Actinic. 73

.Scales, Weighing. lOS

■ Infra-red, 81

Scrnic films 20

■ Invisible, 8i

pictures 250

H Oblique. 47

Scenery 240

^1 Ultra violet. 81

Scott Lamps 233

^ Visual, 72, 80, 81

Screen Magazine 21

■ X-rays, 81

Screw, Drunken, 59

V Reactions. Chemical, lOO

Scum, To remove, 113

Real image 43

Sea gardens 310

Reaumur thermometer 360

Sealing film tins 265

Record on him for double exposure

Sepia red tone 1S3

work 275

Sepia tone 184

Recovery of waste solutions 351, 355

Shadows 294

Rectilinear lenses 73

Sharks 312

Red tone, Copper, 180

Shift, Light. 17S

Uranium, Itii

Ship, Rocking, 286

Reducers 367

Shrunken him IGS

Reduction by toning 178

Shutter S9, 60

Reference books 337

Automatic, 367

Reflection, An^Ie of. 35

dissolve 60

Reflection of tight 33

Side by side magazine camera 62

RifJectors 95

Side lighting 239

Refraction 33

Silk air filter 176

Refraction. Index of. 38

Silver Cyanide Intensifier 366

Reichert, Dr. Ed-. 11

Silver ferrocyanide 1T7

Relationship of carcmaman to other

Sliver foil 82

workers 320 Silvering mirrors 359
B 379

.t^ — ^ ■— — —

•I

Sitverplated racks 179

Silver recovery 351, 355

Silver sludge 321

Silver Suiphide 177

Simons. Ed. L., S30

Simplex twin arcs 233

Skylights 222

Slime 127

Slip cUw movemeat OS

3lot machine 16

Sludge 110, 185

Smithsonian Institute 313

Smoke. Black. 278

Smoke-pots 2SG

Society of Motion Picture Enxi-

neers 18
Softening of emulsion 161
Soft focus 299
Solar focus 50
Solubility 101. 108
Solute 100
Solutions 100
Solutions, How to prepare, 100

Miscellaneous. 122

Percentaee. 103

Stock. 107

Volumetric, 101
Solvent 100
Spear, A. D., 3^2
Spcclroscoi»c 33
Spectrum 30. 33, 80
Speed 00

Speed determination IM
Speed of lenses 60
Speed testing 209
Spherical Aberration 70
Spii^ Reel. Developing instructions

for. HO
Spiral Red developing outfits 140
Spiral Reel for development 139
Spirit figures, Ghost or, 281
Split stage 279
Spoken titles 201
Spot lights 235
Spots, Flare, 74. 75
Spotted film 163
Stage carpenters 321
Stage hands 320
Stain 115

Stain, Black for wood. 358
Stanford, Lcland, 8
Stars, Motion picture, 321
Static 93

Stcadman Aabamctcr 214
Step printer 100, 171
Stereoscopic pictures 10
Still camera 96

Stirring rods 108
Stock bottles 113

Positive, 166

solutions 107
Stops. Lens 216
Stop motion 13
Stop motion crank 278
Stop motion pictures 24'
Stop motion work 278
Storage of chemicals 130
Storing solutions 131
Streaked tilm 163
Studio lighting 323
Studio manager 323, 338
Submarine boat cartoon S48
Submarine Pictures 310
Substitution of Chemicals 12S
Sub-titles 201
Sulphuric acid 120
Sunshade 269
Superimpose SS3
Supers 333
Super saturation 101
Supplementary lens 79
Swimming under water 879
Switch back 205
Symmetrical pictures 293
Sytnographoscope 9
Synthesis of motion 8
Syrup of Vanadium 185
System. K, 67
System, Unifonn, 07
System, U. S., 07

Table of chemical imparities 130
Tabic of Densi ty. Opacity and

Transparency 151
Tables, Avoirdupoi*, 102

Metric. 101

Weights and Measures, 35^
Tabloid Photo chemicals 25S
Tanks, Concrete, 3S1

Kixing. 119

for mixing, 110
Tape line measurement for fociu-

ing 76
Tartaric Acid 120
Telephotography 340
Telephoto lens 49
Telescope 44
Telescope effect 270
Tempermental stars 332
Temperature of solutions 114
Tent, dark room 255
Tessar icns 69, 70

Test for vision £74

Universal Camera, Diss ram of ^^|

Test strips 170

Testing oy hydrometer 105

Mechanism, 54 ^^H

Universal Axes 333 ^^M

Testing chart. Lens. 79

Universal movement 57 ^^H

Text books 25. 338

Unsymmctrical combination lena 70 ^^H

Threading camera 63

Uranium ferrocyanide 177 ^^H

Duplex printer 171

Use of per cent solutions 106 ^^H

Ease of. 60

U. S. System 67 ^H

GiMon camera 62

Prcvost camera G3

Vanadium ferrocyanide 177 ^^H

Theatre stage 226

Varnish, Matte F^lack, 357 ^^M

Thermo metric rules 360

Waterproof, 190, 35S ^^M

Thin negatives 160

Vessels for mixing 108 ^^H

Timing negatives 160

View, Angle of, 65 ^^H

Tint and lone combinations ISO

Vignette 269 ^^M

Tinting and Toning 177

Violet tone 1H9 ^^H

Tinting formula: lOft

Vioiet rays, Ultra. 81 ^^H

Title dccnratinns 199

Virtual image 43 ^^^|

Title writing '^01

Vision ^^M

Titling tilm 109

Visionary figures 283 ^^H

Todd, F. Dundas. 155

Vision in a mirror 3S1 ^^H

Toning and tinting 177

Vision in center of white space 275 ^^H

Toning for Intensification 366

Vision on white or light-colored ot>- ^^^|

Toning time 1S2

^^1

Toning with dyes 368

Visions on Dark Walls 270 ^^M

Topical cameramen 96

Vision, Persistance of. 7 ^^H

Torches, Magnesium, 286

Vision, Test for. 274 ^^H

Toy motion picture camera 60

Visual luminosity 142 ^^H

Toy projector 60

Visual focus 45 ^^H

Tracmg cartoons 263

rays 46, 72, 60, 61 ^^1

Tractor plane 305

Vitagraph Studio 243 ^^H

Transparency 145, 151

Vitascope 17 ^^H

Transparent spots 162
Trave pictures 19, 240

Volumetric Solutions 101 ^^H

^^^H

Tray, How to make developing.

Trays. Metal, i:i9

Trick-Work and Double Exposure ^^M

278

Wallace, Prof. W. H. ISS ^H

Triple exposures 380

Wall paper 318 ^^M

Tripod socket 30R

Warburg, J. C, 5 ^^H

Tropical development 352

War films 19 ^^M

photography 255

Waste, Recovery from, 351 ^^H

Troubles in developing 118

Water filter 129 ^^1

Troy weight 354

Waterproof varnish 190, 358 ^^H

True or return loop 62

Water supply 127 ^^M

Tucker. Geo. Loanc, 804

Water to 101 ^^M

Two-solution developers 118

Watkins. Alfred. 155 ^^H

Two-solution tone 177

Watkin's Exposure Meter 213 ^^H

^H^

Wave length of tight SO ^^H

Waves, Light. 26 ^^H

^^^r

Weak negatives 160 ^^^^H

W Ultra speed pictures 23
■ Ultra Violet light 30

Weighing chemicals 109 ^^^^^|

Weights and Measures 354 ^^^^H

H Ultra Violet rays Bl

Welfare Blms 20 ^^^^H

1 Underexposed ne^tive 141

Wheel of Life 7 ^^^M

■ Under water. Swimming, 379

White Flame Arcs 224 ^^H

^ Uniform System 67

Wide Angle Lenses QS ^^H

381 ^H

Wigs 316

Williamson* J. EL & Geo. M.j,^tt

Wohl Duplex lamps 235 m
Wollensack OptJcgl Company 1»
Wooden trays. How to mike, IW
Wood. Professor It W., 81
\\'oodwork 3 IS
Wright, Orville, 313
Wrinkled film 161
WritinK on Glass 3*7
Writing titles 301

X-B«lcFilm9S
X-tbonU

ZeolitelM
Zaro PartQaxVl

XooMi ErranTO
Zoapnxotcope 9^ U

^^^^^

■

The New York

Institute of Photography

gives a complete
Residence Course
in Photography

MOTION PICTURE

COMMERCIAL

PORTRAITURE

^^H

covering in a thorough and practical way
every phase of this profitable profession

■

JPor Complete Catalog and location
of oar most ceuivenient School
address the central office:

New York Institute of Photography

Department 16 141 West 36th Street
NEW YORK aTY

TH ttO N5

A oonttanaed course )n motton p
SlanttTd Uniwrifly Libraries

3 6105 041 653 531

Stanford University Libraries
Stanford, California

Retan thb book ob or before date dse

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