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PERMOSTANIC INCUBAROR

Ex Qu0-
BY

ms RENWwiCce

THE

Thermostatic Incubator,

ITS CONSTRUCTION AND MANAGEMENT,

TOGETHER WITH DESCRIPTIONS OF

SeeoODERS, NURSERIES,

And the Mode of Raising Chickens by Hand.

if BE

E. S. RENWICK,

| MECHANICAL ENGINEER AND EXPERT.

PUBLISHED BY THE AUTHOR.

NEW YORK:
BURR PRINTING HOUSE.
1883. |

Entered, according to Act of Congress, in the year 1883, by

In the Office of the Librarian of Congress at Washington, D. C.

E.S. RENWICK, “ay Mree-YIrl

CONTENTS.

INTRODUCTION, .

CONSTRUCTION OF THE INCUBATOR,
See hTiGNs FOR Work,
MANAGEMENT OF THE INCUBATOR,
THE CHICKEN NURSERY,

THE HATCHING SEASON,

CLAtImMs OF PATENTSs,

PA&E

INTRODUCTION.

THE Thermostatic Incubator furnishes an efficient —
and reliable means of hatching chickens artificially.
It is the result of numerous experiments, and as its
principal features have been thoroughly tested for
seven seasons, and it has been successfully used in
its present form for two, it is confidently offered for
public use. It is adapted to hatch ducks’ eggs, as
_ well as those of chickens, the author having hatched
with it an average of 250 chickens and 4o ducks an-
nually ; which is as large a number as his family can
dispose of. Partridge eggs have also been hatched
in it, with perfect success.

As the experience of the author may be of service
to others working in the same field, and a statement
of it will enable the construction of the apparatus to
be better understood, it may be worth while to give
a sketch of his labors. The subject was taken up
in 1873 as an amusement, and as a means of divert-

— ee

6 INTRODUCTION.

ing the mind from the cares of an arduous profes-

sional business. The raising of fancy chickens had

been a hobby for years, and the various published
statements of the methods of hatching chickens arti-
ficially had been carefully studied. As the resi-
dence of the author was. heated by steam, it was
thought that a sufficiently equable heat could be
obtained from the top of the steam boiler to do the
work of incubation. Hence an incubator was con-
structed with two drawers, one above the other, and
with the lower edges of its sides curved to fit the
top of the brick casing of the steam boiler ; a ther-
mometer was placed in this incubator, and it was
found that there was sufficient heat for the purpose.
The accounts of the various incubators made by
others had informed the author that there were
three things essential to successful artificial incuba-
tion ; viz., an equable temperature, ventilation, and
moisture. Moisture had been supplied by Bonne-
main and his successors, by placing pans of water
in the incubator beneath the eggs. Ventilation had
also been effected by admitting air to the lower part

of the incubator, and allowing the hot or foul air.to

escape from its top. Following in the steps of his
predecessors in the art, the author fitted his first in-
cubator with a water trough beneath the egg draw-
ers, and with holes for the admission of fresh air,
which was distributed beneath the egg drawers by
means of metal plates. A ventilating hole also was
made at the top, and was fitted with a damper
valve, which was to be opened and closed for the
purpose of varying the draught of air through the in-
cubator and thus regulating the heat. The damper

INTRODUCTION. 7

valve was operated by a very large alcoholic ther-
mometer, holding half a pint of alcohol, which was
closed to the air by an inverted syphon pipe con-
taining mercury on which a float was placed ; and
the float was connected with the ventilating valve.
This alcoholic thermometer proved too sluggish for
any practical use, and was abandoned after a trial of
three days. A second attempt was made to operate
the ventilating valve, and thereby regulate.the heat,
by means of a large mercurial thermometer, the
bulb of which was of iron and contained a pound of
mercury. This also proved to be too sluggish, as it
required a variation of 20° Fahrenheit in the egg
chamber to make it operate the valve sufficiently.
A third attempt was made with a thermostat con-
structed of brass rods and glass tubes arranged like ~
the bars of a compensation gridiron pendulum ; the
requisite amount of movement being obtained by a
system of multiplying levers. This also proved im-.
practicable as a means for opening the valve within
the required limits of temperature. The author
then came to the conclusion that it was expedient
to use a thermometer only to determine the temper-
ature at which the valve was to be moved, and to
rely upon some other force to operate the regulat-
ing valve. He also determined to move the incu-
bator into his work-room and to use lamps to
furnish the heat, as this course would enable him to
continue his experiments while the steam boiler for
heating the house was not in use.

Upon determining to use lamps, the first problem
that presented itself was the regulation of the heat
supplied by them. Ordinary kerosene lamps require

8 INTRODUCTION,

so much force to turn the wick up and down that it
seemed useless to attempt to regulate the heat in
that manner. The author knew of the use of slid-
ing wick tubes for varying the flame of the spirit
lamps used in chemical laboratories, but feared that
these might become so clogged by crusts or deposits
from the flame that their free movement would be
prevented ; he therefore gave up the idea of using
them, and finally came to the conclusion that the
easiest way to regulate the heat would be to permit
the flame of the lamp to burn regularly as it might
be set by hand; and to either use the heat, or to
let it escape without materially heating the incuba-
tor, as the heat of the incubating chamber fell or
rose. In order to operate upon this system, the
author invented his waste heat chimney, which in
its simplest form is a chimney arranged within the
ordinary chimney or flue of a lamp, and fitted at
its upper end with a valve. When this valve is_
closed, the hot products of combustion from the
lamp are compelled to pass between the central
waste heat chimney and the ordinary chimney
or flue; and the walls of the latter being thereby
heated transmit heat to the incubator. When,
on the other hand, the damper valve is opened,
the products of combustion take the direct course
through the waste heat chimney and escape at its
upper end, leaving the outer flue unheated. The
operation of this contrivance is attended with an
incidental operation which was not anticipated, but
which is important. When the heat passes through
the waste heat chimney, the draught is much
stronger than when the heat is passing through the |

INTRODUCTION. 9

outer flue ; and the effect of this stronger draught is
to cause the air which enters the cone or deflector of
the lamp to be deflected more forcibly against the
flame at the flame slot of the burner, and conse-
quently to reduce the volume of the fame. Hence
the opening of the valve or damper of the waste
heat chimney not only allows the heat to waste, but
also causes a reduction of the flame, so that the heat
given out by the lamp is reduced ; while the closing
of the valve of the waste heat chimney not only
utilizes the heat, but also causes the flame to in-
crease in volume. The two movements of the
valve therefore produce incidentally effects upon the
flame similar to those of lowering and raising the
lamp wick.

The next matter to be decided was the means of ©
circulating the heat through the incubator, and for
this purpose water heaters were used operating upon
the plan employed to heat green-houses. Two
lamps were employed for heating, and a separate
water heater was employed for each lamp. Each
heater consisted of an endless pipe of rectangular
cross-section, constructed in the form of a square
ring and set on edge. A pipe or flue was soldered
into one of the sides of this ring heater, so that the
lreated gases from the lamp might pass through this
flue, and heat the water surrounding it. The water
so heated rose in the upright side of the pipe heater,
circulated horizontally along the upper horizontal
part of the heater, descended through the opposite
upright side, and passed horizontally along the lower
horizontal part back to the first upright side of the
_ heater in which the flue was situated, thus making a

IO INTRODUCTION,

continuous circulation. The two water heaters were
placed edge to edge but were reversed right and left,
the lamps being at opposite ends of the incubator,
so that the current in one heater circulated along
the upper part of the incubator from right to left,
and the current in the other circulated in the oppo-
site direction, thus equalizing the heat in the incu-
bating chamber.

The two drawers for eggs were arranged one over
the other, and slid on rails through the rectangular
space within the ring pipes. A waste heat chimney
was secured in each lamp flue ; and a damper valve
capable of being turned edgewise or flatwise, was ar-
ranged in the upper end of each of these chimneys
so that the heat from the lamp might either be per-
mitted to waste through the chimney, or be com-
pelled to heat the flue and the water of the heater
surrounding it.

For the purpose of moving the damper valves,
the author determined to use springs controlled by
electro-magnets, the circuit of electricity for which
should be made and broken by the action of a ther-
mometer. The first thermometer which the author
planned for the purpose was one like Six’s register-

ing thermometer, with a large upright bulb contain-

ing methyline, which moved a column of mercury.
A platinum wire was soldered into the lower bend
of the syphon tube so as to make a constant com-
munication between the galvanic battery and the
mercury. A second platinum wire was soldered in
a downward direction into the descending branch of
the tube in which the methylene expanded, the end
of the wire being set at the point at which the mer-

INTRODUCTION, II

cury would be when the temperature was 98° Fah-
renheit. <A third platinum wire was introduced into
the open ascending branch of the syphon pipe, with
its lower end at the point at which the mercury
would be at 105° Fahrenheit. The operation ex-
pected was that while the temperature should be
between 98° and 105°, the mercury would not make
electric contact with either the second or third wires,
but that both of them would be surrounded by the
methylene, which is a non-conductor of electricity.
Consequently so long as this condition of things
lasted, no electricity would be conducted from the
battery, and the valves would remain at rest.
When, however, the temperature should sink to 98°
Fahrenheit, the mercury would make an electric
connection between the first and second wires; and ©
when on the other hand the temperature rose to
105° Fahrenheit, the mercury would make an elec-
trical connection between the first and third wires.
Iwo electro-magnets were used, and also two valve
engines worked by springs; the one to open the
valves, and the other to close them. Each valve
engine consisted of a train of wheels like a clock
movement with a clock spring to furnish the motive
power, and a fly to regulate the speed ; and each
operated a reciprocating pawl which moved a ratchet
wheel secured to the valve shaft ; one valve engine
turning the valve shaft to the right hand, to open
the valves ; and the other valve engine turning the
valve shaft to the left to close the valves. Each
valve engine was provided with a detent operated
by its appropriate electro-magnet, so that when the
circuit to that magnet was made by the upward

12 INTRODUCTION.

movement of the mercury in the corresponding arm
of the thermometer syphon, the detent was oper-
ated, and the valve engine was permitted to work
and to move the valves.

An electric switch was introduced into each cir-
cuit, and a connection made between the valve shaft
and these two switches so that whenever one of the
valve engines had worked sufficiently (to open or
close the valve)the switch appertaining to the elec-
tro-magnet of that engine was opened and the elec-
tric current was broken notwithstanding the contin-
uance of the connection made by the mercury of
the thermometer. The other switch was simulta-
neously shut so as to make the electric circuit for

the other valve engine complete except the gap to

be filled by the movement of the mercury of the
thermometer ; consequently whenever the mercury
was moved sufficiently by the variation of tempera-
ture, the electric circuit for the valve engine was
completed. Thethermometer was arranged upright
at the rear of the egg drawers, and the foul air was
permitted to escape at the top of the incubator
through a short pipe; the escape being regulated
by a damper valve that was opened and closed with
the waste heat valves, so that whenever the heat

within the incubator rose to 105° the draught of air »

through it was increased simultaneously with the
shutting off of heat from the lamps.

When this apparatus was set at work with several
thermometers distributed in the drawers, certain de-
fects were speedily demonstrated. In the first place ©
it was found that the upper drawer had an average
of eight degrees higher temperature than the lower,

INTRODUCTION. 13

although the difference in level did not exceed four
inches. Inthe second place, it was found that the
fresh air admitted at the bottom of the incubator
did not distribute itself equably throughout it, but
formed currents, taking about the shortest lines
from the entry orifices to the escape orifice at the
top, while eddies were apparently formed in other
parts. Hence the temperature at different parts of
‘the same drawer, and at the same level in the incu-
bator, varied materially ; and although the difficulty
was Overcome to some extent by introducing per-
forated diaphragms beneath the drawers to distrib-
ute the air, this plan proved unsatisfactory. Another
defect was the vertical arrangement of the ther-
mometer bulb, which caused its upper end to be
materially hotter than its lower end. Another
difficulty arose from the fact that the methylene of
the thermometer prevented an immediate electric
connection between the mercury and the platinum
wire ; hence the mercury would sometimes rise half
an inch above the end of the wire in the methylene
of the thermometer before the electric circuit would
be completed,

These defects rendered it useless to attempt to
hatch eggs with the incubator, and it was determin-
ed to reconstruct it, using the same egg drawers.
To obviate the first defect, the two egg drawers
were placed side by side at the same level. To
obviate the second defect, a new system of ventilat-
ing an incubator was devised which has proved to be
one of the essentials of success for artificial incuba-
tion, and for which, among other improvements, the
author has received a patent (No. 193,616, A.D.1877).

14 INTRODUCTION.

According to this system, the fresh air for ventilation
is admitted into the incubating chamber at zfs fof,
while the air in the chamber is drawn off nearer tts
bottom. The warm air is.thus forced to circulate
downward against its natural upward tendency ; and
the practical result is that local currents do not
form, and the air arranges itself in layers or strata
which sink gradually and are of nearly uniform tem-
perature at the same level throughout the incubat-
ing chamber.

A new thermometer was procured with a horizon-
tal methylene bulb connecting with an upright invert-
ed syphon pipe for mercury ; and a steel float swim-
ming upon the mercury was used to communicate
motion to the switches for making the electric cir-
cuits for the electro-magnets. For this purpose
the float was suspended from one arm of a balance
lever which it moved. ‘This lever also carried sus-
pended from each arm an inverted Y shaped plati-
num wire, having its ends arranged to dip into two
mercury cups connected with the circuit wires. The
connection between the float and the balance lever
was so adjusted that when the temperature was mid-
way between the two extreme limits, the balance
lever was level, and neither wire was dipped into the
mercury cups ; when, however, the float was lowered
by a fall of temperature, the lever tipped and one of
the bent wires or switches was lowered into one
pair of the mercury cups and completed the circuit
of one electro-magnet, while the second switch was
raised ; and when the float rose, by the rise of the
temperature, the second switch was lowered to com-
plete the circuit of the second electro-magnet, while

INTRODUCTION. 15

the first switch was raised. The clock mechanism
for moving the valves, and the system of breaking
the circuit by the movement of the valve shaft,
after the valves had been moved the proper distance
by either valve engine, were used as before.

In order that the regulating thermometer might
be affected by the mean temperature of the two egg
drawers, the thermometer was placed in the base of
the ventilating chimney for the foul air. This base
was formed by the space between the slides or rails
of the adjacent sides of the two drawers, which thus
became a chamber for the thermometer. The
syphon pipe for the float protruded at the front of
the incubator; and the balance beam from which
the float was suspended, was supported on a column ©
in a glass case on top of the incubator.

The fresh air for ventilation was supplied through
two air pipes at each end of the incubator. One of
these pipes was a simple pipe rising in the incubat-
ing chamber from an aperture in the end near the
bottom of the incubating chamber to within a short
distance of its top. The other pipe was passed
through the water heater ; it connected at its lower
end with a hole in the bottom of the incubator, and
its upper end delivered the air near the top of the
incubator. By this arrangement, one of the pipes
at each end could be used to supply air of the tem-
perature of the atmosphere, while the other (which
passed through the water heater) supplied air which
was warmed by its passage through the water
_ heater; and either or both ventilating pipes could
_ be used at pleasure.
| In order that moisture might be supplied, water

16 INTRODUCTION.

pans were placed beneath the egg drawers, and
sponges were placed in them to furnish an evaporat-
ing surface. As, however, the circulation of the air
within the incubator was to be downward, addi-
tional evaporating pans were placed above the eggs
so as to supply the hottest air with moisture, which
would be carried down to the eggs by the descend-
ing circulation of air. One of these upper evapora-
ting pans was suspended over each egg drawer, and
was supplied with water from a water bottle placed
on top of the incubator and delivering the water to

the evaporator through a small pipe; the supply

being regulated by a stopcock. Each upper evap-
orator was provided with an overflow pipe, so that
any surplus of water dropped into the pan under the
eggs. This under pan also had an overflow pipe,
delivering the surplus water into a vessel under the
incubator. 4

The first trial of this new incubator with two ther-
mometers in each drawer, demonstrated that it
would operate satisfactorily. The heat throughout
both egg drawers was practically uniform, the varia-
tion in horizontal directions being less than one de-
gree ; while the temperature could be maintained
by the regulating mechanism within one degree of
Fahrenheit. It was fully tested fora month with
thermometers in the drawers ; then, eight fresh eggs
were put into the drawers, one in each corner of
each drawer, and the machine was put regularly at
work. About ten days after starting, some eggs that

had been set upon by hens for a week were also put
into the incubator. The first chicken was hatched

from one of the fresh eggs on the nineteenth day,

oak, :

INTRODUCTION. 17

and the others came before the end of the twenty-
first. After these first chickens were hatched, the
drawers were progressively filled with fresh eggs,
and 160 chickens anda number of ducklings were
hatched that season. In fact the incubator, so far
as the hatching of chickens from fresh eggs (with-
out preliminary sitting under a hen) was concerned,
was practically perfect, and experience demonstrated
that it would hatch every fertile egg. Substantially
the same incubator was used three seasons ; but, as
the electro-magnetic mechanism was costly, and the
thermometer and float mechanism were too delicate
for common use, it was determined to get rid of
them. Accordingly, after the first season’s work was
completed, a thermostat was made of strips of vul-
canized India-rubber and of brass riveted together,
and the change of form of the compound bars by
heat was employed to operate the detent of the
valve engine. The valves of the waste heat chim-
neys, and of the ventilating chimney, were arranged
to revolve, so that a quarter of a revolution of the
valve shaft would open the valves, and the next
quarter of a revolution in the same direction would
close them. But one valve engine was used to do
all the work. A weight also was substituted for a
spring in working the valve engine; the weight
being arranged asin the common Cuckoo clocks. A
drawer for young chickens was placed on top of the
incubator, and the warm air escaping through the
ventilating chimney was permitted to pass through
this drawer, the temperature of which was thus
maintained at about 90° Fahrenheit. |

It was deemed important that there should always

4
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18 INTRODUCTION.

be a sufficient excess of force in the driving weight
of the valve engine to insure the movement of the
valves even in case of an accidental increase of fric-
tion ; but as such excess of weight would tend to
cause the valve engine to move with great speed,
and would cause the detent arms to strike the de-
tent with a jar, a speed controller became necessary.
A fly controller, such as is used in the striking
movements of clocks, requires a train of cog gearing
to drive it at the requisite speed, and was therefore
deemed objectionable. Hence a liquid speed con-
troller was made by arranging a four-bladed paddle-
wheel to revolve in a trough of water nearly fitting
the paddles, and the paddle-wheel was mounted
upon and secured to the valve shaft, so that the
valve shaft could be turned by the weight no faster
than the water would permit the paddles to revolve.
This contrivance works almost without friction, and
controls the speed admirably, preventing any jar or
slam.

~The water heaters, egg drawers, air supply pipes,
and evaporators remained unchanged.

Upon testing the incubator fitted with the ther-
mostat it was found that the pressure of the detent
~ arms against the detent operated by the thermostat
was sufficient to hamper the movement of the latter.
To obviate this defect, the detent arms were re-
moved from the main shaft of the valve engine, and
a separate shaft was added, and was connected with
the main shaft by cog-wheels, so as to make a com-

plete revolution (in place of a quarter of a revolu-

tion) for each revolution of the main shaft. This
modification reduced the pressure against the detent

INTRODUCTION, 19

to only one quarter of what it had been ; but it also
required the reduction of the detent arms to a single
one. Tomake this arm operate both for opening
and closing the valves, two detents were placed side
by side on the rock shaft with which the thermostat
was connected ; the detent arm was constructed to
vibrate crosswise of its plane of revolution ; the end
of the detent arm was made in the form of a T;
and a self-acting switch was placed in its plane of
revolution, so that the detent arm during each rev-
olution was moved laterally by the switch, and
was caused to operate alternately upon each detent.
This contrivance worked well, and the incubator
with it was kept in continuous operation, hatching
chickens, forfourmonths. The switch arrangement
was not however as good a contrivance as the inven-
tor deemed desirable ; hence while the incubator
was in operation he devised a new plan of valve
engine, in which twodetents were used ; the first or
regulator detent being operated by the thermostat,
and controlling the action of a light spring, while
the second detent was operated by this spring, and
controlled the action of the weight of the valve
engine. By this contrivance the resistance pre-
sented by the valve engine to the movement of the
regulator detent by the thermostat, was reduced to
the friction caused by the pressure of the light
spring ; and the thermostat was relieved of the labor
of operating the main or engine detent which con-
trolled the action of the weight of the valve engine.
As the light spring ran down partially at each opera-
tion, a connection was made between it and the
main shaft of the valve engine, so that, whenever

20 INTRODUCTION.

the latter turned to operate the valves, it wound up
the light detent spring as much as the latter had
run down in operating the second or engine detent.
The connection between the spring and the main
detent was made by means of two light cog-wheels.
This new form of valve engine worked admirably,
and it left nothing further to be desired in that
direction. The incubator, however, still contained
water heaters for circulating the heat, and the
author determined to dispense with these, and to
circulate the heat through the incubator by the air
employed for ventilation. To accomplish this, the
ascending air supply pipes were made large enough
to receive within them the upright flues of the
lamps ; the space between the exterior of the lamp
flue and the interior of the air supply pipe being
about half an inch broad all round the lamp
flue. The heat, radiated into each of the two air
supply pipes by the lamp flue within it, caused cur-
rents of air to set upward through them ; and this
air, being heated in its upward passage, and escap-
ing at the upper ends of the air supply pipes, dis-
tributed the heat through the incubating chamber.
The lamp flue, after ascending through the air sup-
ply pipe nearly to the top of the incubating chamber,
was conducted horizontally toward its centre, and
was fitted with an escape pipe passing through the
top of the incubator, so that a large radiating sur-
face was provided in the top of the incubating
chamber. In order to supply moisture to the large
quantity of air which would pass through the incu-
bating chamber, it was deemed inexpedient to rely
upon spontaneous evaporation ; consequently an

INTRODUCTION. 21

evaporating pan was applied to the head of each up-
right lamp flue, and provision was made to supply
each evaporating pan constantly and automatically
with water from a font on top of the incubator.

Upon testing the apparatus with this hot air system
of heating, it was found that the heat could be
maintained within the required limits as easily as
with the water heaters ; but the quantity of water
required for moistening the air had been overesti-
mated, and the air became so thoroughly saturated
with moisture that as it cooled, while moving down-
ward to the level of the base of the ventilating chim-
ney, a portion of the water was deposited upon the
eggs and stopped the pores of the egg shells. Such
a stoppage, if complete, is fatal to incubation; because, ~
although the hatching of the germ under such cir-
cumstances commences and proceeds regularly for
some days, death takes place sooner or later by
suffocation. The excessive supply of moisture was
corrected by reducing the evaporators to half their
first dimensions, and then the incubator worked
admirably, hatching every fertile egg up to the time
of breaking the shell ; at which crisis (as is always
the case with eggs from parents too closely related)
a small percentage of chickens are sometimes unable
to free themselves by reason of some malformation,
or a wrong position of the beak ; it being occasion-:
ally the case that the head of a chicken in the egg is
tucked under one leg, or that the beak is deformed
so that it does not pierce the shell.

The success of the hot air system, with supple-
mentary evaporation automatically regulated in
quantity, has been so well demonstrated by constant

22 INTRODUCTION,

use, that it is believed it must supersede the system
of water heating ; particularly as it enables a large
supply of fresh air to be circulated through the in-
cubating chamber, without an excessive loss of heat.
Consequently the author now employs this system
exclusively. The descending system of ventilating
the incubating chamber devised by the author, in-
sures the heating of the upper sides of the eggs
hotter than their lower sides, as is the case with eggs
under a hen; while the supply of moisture above
the eggs insures the saturation of the hot air with
moisture before it comes in contact with the eggs,
so that they are not materially deprived of it.
With the usual hot water system of distributing the
heat, it is necessary to wet the eggs frequently by
dipping them in warm water. The system now used
by the author renders such dipping unnecessary ;
while the automatic supply of water by means of
fonts, operating upon the principle of the bird foun-
tain, keeps the evaporation constant, and renders it
easy to observe the quantity used.

As to the temperature required to hatch eggs suc-
cessfully, the views gathered by the author from the
information published on that subject at first led
him to believe that only a minute variation from a
certain temperature was permissible. This tempera-
ture was stated to be 104° or 105° Fahrenheit. In
order to test the correctness of this temperature, the
author applied a delicate recording thermometer to
the breast of a sitting hen, and found the tempera- —
ture to be 106°. It was, however, manifest that
the egg during hatching cannot attain this tempera-
ture, because its upper side only is next to the hen,

INTRODUCTION. 23

while its lower side is in contact with the ground.
_ In order to ascertain the internal temperature of the
egg, the end of one was pierced with a hole of suff-
cient size to admit a thermometer bulb ; a little car-
_ bolic acid was mixed with the contents to prevent
_ putrification ; the thermometer bulb was inserted
_ centrally, and the crevice around the thermometer
tube was closed with plaster of Paris. The egg thus
prepared was placed under a sitting hen, and in the
centre of a clutch of eggs that had been set upon for
several days. The temperature of the egg at the
time was 65°. The temperature rose to 98°, and
_ then remained constant during the day. Early the
pec morning, the temperature was 96°. It was

Wey 1

war: xt

_ therefore evident that the temperature, to which
_ eggs might be exposed in an incubator, might vary
from 96° or 98° to 106° (the temperature of the hen’s
_ breast) without danger. Before this experiment was
_ made, the author had assumed that the variation of
_ temperature should not exceed two degrees ; and
; the first system of regulation used successfully by
_ him (by means of the methylene thermometer and
_ an electro-magnetic detent mechanism controlling a
_ valve engine), could be readily adjusted to maintain
_ the heat within one degree (in either direction) of
_ any desired mean temperature, as proved by a regis-
_ tering thermometer. The experiments with an egg
under a hen, and other facts, led him to the conclu-
_ sion that such excessive nicety was useless. It was
_ also known that eggs had been hatched successfully
| by keeping the egg in contact with the human body ;
_ and, asthe temperature of this rarely exceeds 98°,
{ that temperature must be high enough. Conse-

24. INTRODUCTION.

quently with incubators now made by the author,
no attempt is made to maintain the tom pega iy
more regularly than between 98° and 103°; and this
is found sufficient for all practical purposes. The
mean temperature of the contents of an egg under —
such circumstances is about IO1°, rising sometimes
to 102°; which is hotter than the above-mentioned
experiment demonstrated to be the case with an egg
under a hen. There is no doubt that a fresh egg
will hatch a little faster, if the temperature be main-
tained closely to 102°, than it will if the temperature
be permitted to vary down to 96° or 98° ; the hasten-
ing sometimes being as much as thirty-six hours ;
but as eggs hatched in the natural way require an
average of twenty-one days for the work, and asa
temperature oscillating between 98° and 103° will
bring out the chickens from fresh eggs in from
twenty to twenty-one days, there is no necessity for
greater uniformity. : |
Incubators made by the author are provided with
a thermometer whose bulb is on about a level with
the middles of the eggs. The highest temperature
denoted by these thermometers should not as a gen-
eral rule exceed 107°, and need not be more than
102° ; while the lowest should not be below 97°, un-
less when the drawers are open, or some unusual
occurrence takes place. An occasional rise of tem-
perature in the drawers to 110° will not destroy life
in an egg, provided this temperature be not main-
tained too long; and an occasional descent below
go° is not fatal ; if in both cases there be good ven-
tilation and sufficient moisture in the air, as is

INTRODUCTION. 25

always the case with the thermostatic incubator
hereafter described.

In addition to the peculiar systems of descending
ventilation, heat regulation, and moisture supply
devised by the author, he has invented several im-
provements in the construction of thermostats
which are important as rendering their operation
more certain and more delicate. One of these con-
sists of the combination of two compound thermo-
static bars with one multiplying lever, the fulcrum
pivot of which is carried by one of the thermostatic
bars. This combination enables about double the
amount of movement for regulation to be obtained
with thermostatic bars of the same length as com-
pared with the common system of levers. Another
improvement is the counterpoising of the weight of
the compound thermostatic bars, so as to leave prac-
tically their whole expansive force available for reg-
ulation. Another improvement is a shifting weight,
which is operated by the valve engine and aids the
movement of the thermostat alternately in opposite
directions, thus counterbalancing the frictional re-
sistance of the regulator detent. These improve-
iments enable the thermostat to regulate the heat
with certainty within about one degree of either side
of a given mean temperature as tested by a delicate
thermometer notwithstanding rapid variations in the
supply of heat.

Another improvement devised by the author has
reference to the turning of the eggs automatically.
As early as 1875 this subject engaged his attention,
and in January, 1876, several plans of accomplishing

26 INTRODUCTION.

the work were invented. These plans were all

based upon the principle of turning the eggs by the

frictional contact of their surfaces with those of
rollers, or of belts, upon which the eggs rest ; and a
patent, dated. February 3d, 1880, No. 224,224, has
been granted to the author for this system. The
best mode of embodying it is to construct the egg
holders or egg drawers with a series of parallel roll-
ers, whose journals are supported in bearings se-
cured in the front and back of the drawer; the
axes of the rollers being about two inches apart, and
the rollers being one inch in diameter. The rollers
are connected by bands, so that when one roller is
turned, the whole set turn in the same direction.
Hence an egg laid upon any two rollers is caused to
turn by the frictional contact of its shell with the
surfaces of the rollers. One of the rollers is fitted
with a toothed ring, to which the hand is applied if
the turning is to be done by hand. If the turning
is to be effected automatically, one of the journals
.is fitted with a ratchet-wheel, and a reciprocating
pawl is fitted to act upon the teeth of this wheel.
The pawl is operated by clock-work having the
ordinary time movement and also a turning move-
ment similar to the striking movement of an ordi-
nary striking clock, but moving the pawl instead of
the bell hammer ; so that at any desired interval of
time, say every half hour, the time movement of
the clock releases the turning movement, and lets
the pawl turn the ratchet-wheel and supporting roll-
ers, one or more teeth. In place of using special
clock-work, the pawl may be connected either with
the valve engine of the incubator, or with a shaft

INTRODUCTION, 27

worked with a special weight, but connected by a
detent with the valve engine ; so that at every alter-
nation of temperature, the eggs may be partially
turned. The eggs will thus be turned progressively,
and a complete revolution may be effected in about
six hours, more or less as deemed expedient. In
place of turning the eggs continually in the same
direction, two ratchet-wheels may be used with a
reversible pawl, or with alternating pawls; so that
the eggs may be turned alternately in opposite -
directions.
An incubator embodying all the author’s inven-
' tions thus far described, proved to be too expensive
| a machine for common use, hence the attempt was
) made to simplify its construction without materially
affecting its efficiency. This attempt led to a series
| of experiments resulting in the form of incubator de-
scribed hereafter, and in certain additional improve-
| ments for which patents have been granted. This
\ incubator is described in the following pages ; it holds
160 eggs, and can be sold at a moderate price. In
it the new style of thermostat, invented by the
author and operating by tension, is employed to de-
-termine the temperature at which the valves of the
| waste heat chimneys are to be opened and closed by
a weight, like a clock weight ; the thermostatic bar
' being subjected toa heavy tensile strain by which
_ the tendency to spring and operate irregularly is
practically done away with. The valve engine is a
strong piece of mechanism without a single cog-
wheel ; all of its members, including the liquid speed
controller, being secured in a strong brass frame,
and being protected from dust by a glass shade.

28 INTRODUCTION.

This incubator can be managed by any person who
is competent to operate a sewing-machine or to take
care of a clock ; and it can be operated in any room
in a house, as with ordinary care an egg need never
be broken in it, and need never become offensive.
As this incubator has been thoroughly tested, it is
‘confidently offered to those who wish to raise chick-
ens for either profit or amusement.

ROLLER EGG DRAWER.

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CONSTRUCTION OF THE INCUBATG®.

THE Thermostatic Incubator in its present form
has a capacity of 160 eggs, It is represented in
Figs. 1 to 8 inclusive, Fig. 1 being a perspective view
of it. Fig. 2 is a horizontal section of it above
the egg trays. Fig. 3 is a vertical longitudinal sec-
tion of the incubator through one of the waste heat
chimneys. Fig. 4 is a plan of the incubator with
the top removed. Fig. 5 is a central vertical longi-
tudinal section of the incubator. Fig. 6 isa view
of the end at which the valve engine is arranged.
Figs. 7 and 8 are views of the valve engine of about
two fifths of the working dimensions. The same
letters are used to indicate the same parts in the
various figures.

The incubator comprises the following principal
parts—viz. : :

ist. The incubating chamber, which is the in-
terior A A’ of the main case. .

2d. The egg holders B B’, which are the draw-
ers or sliding trays at the front and rear of the ap-
paratus. Each of these will hold, without crowding,
40 eggs, which are laid in rows. If the eggs are
crowded together, the drawers will hold a larger
number, but crowding interferes with the turning of
the eggs. The bottom of each drawer is composed
of rollers upon which the eggs lie, and which are
connected by elastic bands, so that when one roller

CONSTRUCTION. 31

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Ol MoE SSS SSW See SS

is turned all revolve cqually and compel the eggs
to turn. Hence all the eggs in one drawer can be
turned simultaneously by a slight movement of the
hand applied from beneath to a stud-wheel x; the
drawer being first partly drawn out of the incuba-
tor. This construction of egg holders with rollers
was patented to the author February 3d, 1880,
(Patent No. 224,224), and he is the only person who

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32 | CONSTRUCTION.

is authorized by law to use it or to permit others to
do so.

3d. The heat flues d d. In the author’s first in-
cubators these were at opposite ends of the incuba-
tor, but in those now made the heat flues are both
at one end of the incubator, this arrangement being
in many respects the most expedient. Each heat
flue projects below the bottom of the incubating
chamber, so that the projecting end may be engaged
in the short chimney g of alamp C. Each flue rises
to the upper part A of the incubating chamber (A
A’), where it passes into a box # in an evaporating
pan M. From this pan the flue ee’ extends hori-
zontally toward the opposite end of the incubating
chamber, where it is fitted with a vent pipe a,
which passes into the ventilating chimney. The
horizontal portion, e’, of the flue is broad and thin,
and becomes broader as it recedes from the lamp, so
as to present a radiating surface which increases in
size as the heat of the gases from the lamp
diminishes. ite

4th. The lamps C C, by which the heat is sup-
plied. These have ordinary kerosene burners and
short tin chimneys g, each fitted with a pane of mica
_ to permit the flame to be inspected. The lamps
are trimmed and filled in the common way. Each
lamp is supported upon a movable spring lamp gal-
lery T, which can be depressed to disengage the
lamp chimney from the flue above. To remove the
lamp for filling and trimming, the operator should
srasp the Jamp font with one hand and should pull
the gallery downward with the other hand suffi-
ciently to disengage the lamp chimney from the flue

CONSTRUCTION. 33

= =

_ above it ; then he should lift the lamp out of the
cavity of the gallery and draw it toward him, after
which the lamp gallery should be allowed to rise

| No N
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WALI Zl.
SSNS

34 CONSTRUCTION.

gently. The wick should be trimmed slightly
rounding. When the lamp is filled, trimmed, and
lighted, it may be replaced in the cavity of the
lamp gallery, which should be drawn down for the
purpose, by applying one hand to the knob pendant
of the gallery, sufficiently to permit the short lamp
chimney to pass beneath the heat flue ; and when
the lamp font is engaged in the gallery, the latter
should be permitted to rise slowly by the force of the
spring, while the font is steadied by the hand so as
to guide the short chimney over the end of the heat
flue. The short chimney should be put on with its
mica pane outward, so that the height of the flame
can be observed.

The lamp fonts are purposely made of large size,
so that they will hold kerosene enough for forty-
eight hours, in case the operator should some day
forget to fill them. The size of the lamp burners
depends upon the temperature of the room in which
the incubator is used. If the temperature of the
room does not sink lower than 65° Fahrenheit, the
ordinary “‘ A’’ burners may be used with advantage.
If, however, the temperature of the room is liable to

run down below 65° Fahrenheit, ‘“‘ B’’ burners —

should be used ; care being taken that the wicks are
not turned up too high. The lamp fonts will admit
of the use of burners of either size, reducing rings
being used to accommodate the rings of the fonts to
the dimensions of the screws of ‘‘ A’’ burners.
The only objection to the use of the larger (“‘B’’)
burners at all times is the risk of burning more
kerosene than is necessary, and the consequent waste
of oil. If, however, care be exercised in the adjust-

Oe ee ee

iia 2,

CONSTRUCTION. 35

ment of the wicks, a little practice will enable the
operator to use the “‘ B”’ burners without waste of

nih =
Wh

| thi
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Wii)
f =

FIG. 6.

oil, whether the room be warm or cold; but if the
incubator be put at work in this latitude during the

36 CONSTRUCTION. |

winter, it is safer to start with B burners and to
change the burners when the warm weather in May
commences. |

5th. The waste heat chimneys II. There is one
of these for each lamp; each chimney extending
through the lamp flue, and passing out of the top
of the incubator, where the chimney is fitted with an ~
acorn-shaped drop valve E. When this valve is
lowered, the chimney is closed, the waste of heat
is prevented, and the heated gases from the lamp
are compelled to pass through the lamp flues d, ¢ e’,
and to heat the incubator. When the valves are
raised, the waste heat chimneys are open, and the
greater part of the heat from the lamps escapes,
thus permitting the incubator to cool.

Hence the opening or closing of the valves of the
waste heat chimneys determines the heat of the in-
cubator ; and this opening and closing is effected
automatically by the valve engine as controlled by
the thermostat.

6th. The air supply pipes for fresh air. There is
one of these, J, surrounding each lamp flue d@. The
fresh air from the air supply pipes is discharged into ©
’ the upper part of the incubating chamber beneath
the evaporating pans M ; and the air is heated as it
_ rises, by the radiation of heat from the upright lamp
flues d. |

7th. The ventilating chimney G. This is located
at the end of the incubator which is furthest from
the lamps. A part of it is within the casing, being
formed by the partition £, the residue projects —
above the top of the incubating chamber.

The ventilating chimney connects by openings

CONSTRUCTION. 37

through the lower part of the partition %, with the
incubating chamber beneath the perforated bottoms
of the egg holders or trays. Hence while the hot
air enters at the top of the incubating chamber at
one end of it, the foul or colder air passes into the
ventilating chimney from the bottom of the oppo-
site end of the chamber, and consequently there is
a downward circulation of the heated air through
the egg holders and incubating chamber. This
downward circulation (as previously explained)
tends to equalize the temperature in horizontal
directions, while it causes the upper sides of the
eggs to be hotter than their under sides, thus corre-
sponding with the application of heat from the body
of a hen in natural incubation.

The ventilating chimney also receives the spent
gases from the vent pipes a of the heat flues, so that
it is always kept warm by such gases, and conse-
quently has a good draught. If, however, the
draught should not prove sufficiently active in hot
weather (when but a comparatively small quantity
of heat is furnished by the lamps) to insure the req-
uisite circulation of air, a piece of pipe two feet in

_length may be applied to the upper end of the ven-
tilating chimney so as to lengthen it.

In the first incubators made by the author, the
base of the part of the ventilating chimney above
the incubating chamber was enlarged to receive a
valve, which being operated by the valve engine con-
trolled the ventilation automatically. In the incu-
bators as now made by the author, the ventilating
valve (Z’, Figs. 5 and 7) is arranged at the end of the
incubator nearest the valve engine, where it is oper-

;
_

38 CONSTRUCTION.

ated directly by the same rock shaft, D, that works
the waste heat chimney valves E, being opened
and closed simultaneously with them. The opening
of this ventilating valve produces supplementary
ventilation, and by letting the hottest air escape,
prevents possible overheating; but the valve per-
mits only a partial escape of the heated air, so that
the circulation through the incubating chamber is

continued, notwithstanding the opening of this ven-—

tilating valve.

8th. The evaporators. These consist of two
pans (M M, Figs. 3 and 4), located in the upper
part of the incubating chamber at the heads of the
upright portions of the heat fluesdd. Their office
is to supply moisture to the air, thus preventing the
drying of the eggs. Each evaporator is supplied by
a font, N, Figs. 1 and 6, having a feed pipe pro-
jecting from its bottom and passing downward,
through a hole in the top of the incubator, into its
appropriate evaporating pan. The feed pipe of
each font is fitted with an automatic ball valve
which prevents the escape of water while the font is
being withdrawn and replaced. When a font is to
be filled, it should be quickly raised with one hand

and moved over a shallow pan ora saucer so that

any drip may be caught. Then the forefinger of the
other hand should be applied to the nozzle of the
feed pipe, and the font should be turned upside
down and rested upon its head. It may then be
readily filled by means of a pitcher and a funnel.
After it has been filled, the forefinger of one hand
should be applied to the nozzle before the font is
turned head upward ; and after it has been turned,

CONSTRUCTION, 39

it should be held momentarily over the pan or
saucer, to catch any drip after the finger is with-
drawn from the nozzle. The font may then have
its nozzle entered in the hole in the top of the in-
cubator, and should be lowered to its place. As the
font descends, the ball valve is opened by a pin
secured to the evaporating pan, and the water
escapes whenever the level of the water in the
evaporating pan sinks low enough to unseal the
nozzle of the font.

gth. The heat distributor. As the lamps and the
evaporators are both at the same end of the incuba-
tor, and as the heat of the flues must therefore be
progressively less as they extend toward the opposite
end, while the air admitted for ventilation also
tends to cool down in its passage from the vicinity
of the evaporators onward and downward to the
lower end of the ventilating chimney, the incubator
should be hottest near the lamps, and the heat
should be progressively lower toward the ventilating
chimney. This is the natural tendency; and to
obviate it, the heat distributer R is provided. This
distributer consists of a diaphragm of pasteboard,
or other material, arranged horizontally between the
under sides of the horizontal flues ¢ e’, and the open
tops of the egg holders beneath. The diaphragm is
partly cut away so as to permit the descent of the
warm air and the moisture carried by it ; and the
removal of portions by cutting away is greatest over
the drawers which are furthest from the lamps.
The operacion of this distributer is to obstruct the
direct downward passage of all the warm air through
the drawers that are nearest the lamps ; to cause a

—

40 CONSTRUCTION.

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CONSTRUCTION. 4I

large portion of the hot air to move along over the
distributer to the drawers that are farthest from the
lamps ; to obstruct the direct radiation of heat from
the portions of the horizontal flues ge’ that are nearest
the lamps ; and by the above operations to distrib-
ute the heat more equally than it would be other-
wise. The substance which we prefer to use as the
material for the heat distributer is what is com-
monly called heavy tar-board, which is a pasteboard
made from tarred junk, and it is thoroughly var-
nished with shellac varnish to repel moisture.

1oth. The valve engine. This engine is repre-
sented more fully in Figs. 7 and 8. It is mounted
_upon a pedestal at the top of the apparatus, and is
covered by a removable glass shade R*. Its main
shaft W, Fig. 7, is fitted at one end with a crank P,
whose wrist pin is connected by means of a con-
necting rod 4 with an arm projecting from the valve
shaft (D, Figs. 5, 6 and 7) beneath the valve engine.
This valve shaft extends across the top of the incu-
bator and is fitted at its ends with arms from which
the drop valves E are suspended. The weight of
the valves and arms of this rock-shaft is counter-
poised, so that avery small force is required to move
the valves. ;

The valve engine is driven by a weight hanging
upon a chain which passes round the chain pulley (O,
Fig. 7) on the main shaft W. The chain is endless,
and is divided into two loops by the winding pul-
ley X. Each loop holds a weight ; the larger (0’) of
which furnishes the force for driving the engine,
while the lighter weight o*tautensthe chain. As the
heavier weight runs down in working the valve

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CONSTRUCTION. 43

engine, the lighter weight is drawn up, and if the
heavier weight should be permitted to run down to the
floor, the further movement of the valve engine would
be prevented. Hence the heavier weight must be
wound up periodically, generally every morning and
evening, the winding being effected by taking hold
of the strand of chain which extends from the
lighter weight o° (Fig. 6) to the winding pulley X and
pulling it downward ; the operation being repeated
until the heavier weight is wound up close to the
winding pulley. Care must be taken that the loops
of chain are not twisted, and are not out of the
pulleys of the weights or the winding pulley ; either
of which contingencies would render the valve engine
inoperative.

The valve engine now used is less sensitive in its
action than the most perfect one which the author
has produced ; but the loss in sensitiveness is com-
pensated by simplicity, while the sensitiveness is
sufficient to cause the engine to operate with a
change of 3° of temperature. Those who desire a
detailed description of a valve engine so sensitive that
it will operate with a change of half a degree of
temperature, will find it in the author’s American
patent, No. 210,550, dated December 3d, 1878, a
printed copy of which may be procured from the
Patent Office.

11th. The speed controller. This consists of a
four-armed paddle-wheel y, Figs. 5, 7, and 8, revolv-
ing ina trough Y containing a liquid. Its office is
to prevent the valve engine from moving too rapidly
and stopping with a jar. The trough should be
filled with oil or glycerine up to within about three

44 CONSTRUCTION.

quarters of an inch of its brim, and the liquid should
not be allowed to become thick. The best liquid
for the purpose is a mixture of about equal quantities
of water and glycerine, with the addition of about a
teaspoonful of carbolic acid to prevent putrefac-
tion. This mixture rarely requires replenishing.
The liquid prevents the rapid movement of the
paddle-wheel ; and as the paddle-wheel is secured to
the main shaft of the valve engine, the speed of the
latter is controlled, although the force of the driving
weight is considerably in excess of that required to
move the valves.

The mode in which the valve engine operates is
as follows: Above the main shaft W there is a rock
shaft F, which carries a lever c, having at one end a
curved plate Z. The main shaft is provided with
arms S S* (hereafter more fully described), which
alternately come in contact with the slotted curved
plate Z, called the detent. The heavier weight o
tends continually to cause the main shaft to revolve ;
but this revolution is alternately permitted and
stopped by the action of the detent Z,whose position,
as hereafter described, is determined by the Thermo-
stat. Whenever the main shaft revolves, it carries
with it the crank P. If the crank is thereby turned
half a revolution from its lowermost to its upper-
most position, the rock shaft D is rocked to drop
the drop valves E E, thereby forcing the heat from
the lamps to pass through the flues and raise the
temperature of the incubator. When, on the other
hand, the crank P isturned half a revolution from its
highest to its lowest position, the rock shaft D is
rocked to raise the drop valves F, thereby allowing

CONSTRUCTION. AS

the heat from the lamps to escape, the result of
which is the cooling of the incubator until the next
operation of the valve engine.

12th. The thermostat. This is a species of ther-
mometer using the expansion of a solid in place of
the expansion of a liquid to indicate variations of
temperature. The first thermostat used by the
author was a compound har composed of two strips
of vulcanite and brass riveted together, and various
improvements were devised to render the imple-
ment sensitive and certain in its action. The ther-
mostat now used, while sufficiently sensitive in its
action, can be afforded at a less price than the com-
pound bar, and its construction is based upon the
different longitudinal expansions of vulcanite and dry.
wood or equivalent material. It consists of a strip
of vulcanite s, Fig. 5, strained longitudinally upona
frame composed of two wooden bars ¢ ¢, and of the
metallic connections ~ of those bars. The strip is
about thirty-nine inches long, and the difference in
expansion between it and the wooden bars is multi-
plied by two levers V’ V’, the last of which is con-
nected by a rod / with the lever arm w of the de-
tent Z of the valve engine. The weight of the
longer arms of the levers and of the rod / is more
than counterpoised by the weight U, so that the

strip of vulcanite is constantly under longitudinal

tension, and the play or loose fitting of all the con-
nections is taken up. The thermostat is set in the
middle of the incubator between the backs of the
front and rear drawers or trays, so that it is exposed
to the variations of temperature which affect the
eggs. The longitudinal expansion of the vulcanite

46 CONSTRUCTION.

by an increase of heat in the incubating chamber
permits the weight U to move the detent Z of the
valve engine downward ; and the contraction of the
strip incident to a decrease of heat raises the weight
U, and moves the same detent upward.

The mode in which the detent controls the move-
ment of the valve engine is as follows: The main
shaft of the engine is provided with two detent
arms S S’, Figs. 7 and 8, the end of each of which
is bent horizontally and is fitted to bear against the
curved plate of the detent Z. At the central part
of this curved plate there is a slot 7 large enough to
permit the bent end of either detent arm to pass —
freely ; but when the slot does not correspond with
the position of the bent end of the detent arm, the
movement of the latter is stopped by contact with
the curved plate of the detent against which the
arm then rests. Thedetent arms are diametrically
Opposite each other, but their bent ends are at
different distances from the centre of the main shaft
W, from which they project ; the difference in dis-
tance being such that if the detent be in the position
to permit one of the arms to pass through its slot, the
opposite detent arm, after making half of a revolu-

tion with the main shaft W, will have its movement

stopped by contact with the surface of the detent
plate. If such stoppage should occur when the
bent end of the longer detent arm comes in contact
with the detent Z, the valve engine will remain at
rest, notwithstanding the effort of the weight to
turn the main shaft, until the heat in the incubating
chambers falls and the consequent contraction of
the thermostat pulls the detent plate upward and

CONSTRUCTION, A7

brings its central slot opposite the bent end of the
detent arm, thus freeing it and permitting the main
shaft to turn and close the drop valves. This
operation requires half a revolution and brings the
shorter detent arm to the detent plate, the slot of
which, however, does not now correspond with that
arm. Hence, the further movement of the shorter
detent arm will be prevented, and the valve engine
will remain at rest until the heat rises sufficiently to
expand the thermostat and let the detent be moved
downward by the weight until its slot comes oppo-
site the bent end of the shorter detent arm, and
releases it ; whereupon the valve engine will be per-
mitted to make a second half of a revolution, and so
to open the drop valves.

The relative differences of the lengths of the de-
tent arms and the width of the slot in the detent de-
termine the variation in temperature which is per-
mitted, and the apparatus is permanently adjusted
to operate with a variation of about 3° Fahrenheit.
The highest temperature to be attained is adjust-
able by the user; and two means of adjustment
are provided, either or both of which may be used
as found expedient. One of these means is the
screw H (Fig. 5) by which one end of the vul-
canite strip of the thermostat is held in place. The
milled head of this adjusting screw is at the outside
of the end of the incubator that is farthest from the
lamps, and it movesa lever with which the end of the
vulcanite strip of the thermostat isconnected. The
turning of the upper edge of this screw head to the
right hand has the same effect upon the multiply-
ing levers as a reduction of temperature ; and the

48 CONSTRUCTION.

turning of the same screw head to the left hand has
the same effect as a risein temperature. As this ad-
justing screw operates almost directly upon the
vulcanite, its movement provides for large adjust-
ments of temperature.

The second means of adjustment consists of adjust-
ing nuts 7 applied to the screwed upper end of the
rod /, Fig. 8. The upper of these nuts only is neces-
sary, as the lower nut may be left a short distance
below the sleeve connection with the detent. If
the temperature of the incubator is to run higher,
the upper adjusting nut # is to be screwed higher
on the rod /, and if the temperature is to run
lower, the upper nut is to be screwed downward on
the rod. If the lower nut is used, it must be
screwed upward after the upper nut is moved, and
must be screwed downward before the upper nut is
moved. This second means of adjustment provides
for small adjustments of temperature, and for any
swelling and contraction of the case of the incubator
which may possibly take place.

a _—

PREPARATIONS FOR WORK.

THE incubator should be placed in a room in the
house, where it will not be exposed to excessive
heat or cold, nor to drafts of air. The incubator
may be used in any room occupied for other pur-
poses, as when ordinary care is taken it does not
give out any smell or effluvia. The first incubator
of the author was operated in his billiard-room, and

_for seven years past all the chickens have been

6 a i Oe OO EE re —c_c_c ee

eae ar a a Pina A

hatched in the house ; the incubator being in charge
of the gardener, who comes in for a few minutes,
morning and evening, to attend to it.

Before starting the incubator, the valve connec-
tions should be examined for the purpose of ascer-

_ taining whether the valves are in a condition to move

freely. The valve shaft should always have a little
play endwise, so as to prevent binding. It should
be noticed whether the valves when lowered do or
do not drop fairly into the heads of the waste heat

chimneys. If they do not, the screws which secure
the heads of the waste heat chimneys to the top of

the incubator may be slacked, and the heads may be
moved to suit the valves, after which the screws
should be retightened.

The paddles of the liquid speed controller should

_ be examined for the purpose of ascertaining whether

they turn freely in the trough. The arms may have

been bent, in which case they should be bent back ;
ip |

50 PREPARATIONS.

or the trough may have been displaced by the jars of
transportation, and its sides may bind against the
paddles. In such cases the sides of the trough may
be slightly bent, or the screws that secure the
trough to the frame of the valve engine should be
slacked and the trough moved sufficiently to free
its sides from the paddles, after which the screws
should be retightened.

The bearings of the valve engine and weight pul.
leys should be oiled with sewing-machine oil, or
(better) with clock oil; as well as the face of the
curved detent plate. An extremely small quantity
of oil is required for this purpose, as may be judged |
from the fact that a single fluid ounce served the —
author six years. The oil is most readily applied
by dipping the end of a piece of small wire in the |
oil, and transferring the minute drop to the bearing. |

The trough of the speed controller should be
filled with water, or with the mixture of glycerine |
and water previously mentioned, to within about
three quarters of an inch of its brim.

The freedom of the valve engine and valves
should be tested by causing the regulator detent (Z,
Figs. 7, 8) to move up and down by turning the
adjusting screw H, Fig. 5, in alternately opposite
directions, so as to release the two regulator detent
arms successively ; the weight being permitted to
work the engine and valves after each movement.
If the valves do not open and close regularly, some-
thing binds which requires adjustment.

When the engine and valves are found to operate
properly, the lamps may be filled and lighted, and
the glass water fonts may be filled with water and —

PREPARATIONS. 51

put in place; the adjusting screw being so turned
that the valves remain closed, with the detent slot
about an inch above the end of the detent arm.

The lamp wicks should be turned up after the
lamps are in place, slightly at first, and farther as
the flues become warm and the draught improves,
care being taken that the wicks are never turned up
so high that the lamps smoke. The height of the
flame to be used depends upon the temperature of
the room in which the incubator is used. Asa
general rule, the flame should be of such a height
that the valves will open and close on the average
about two or three times an hour when the ap-
paratus is in working order. If the wicks are trim-
med properly, flames of B burners of about three
eights of an inch in height above the cones or
deflectors of the lamps will answer, when in the
spring of the year the temperature of the room
varies from 50° to 7o°. In summer the flames
should be lower than in spring; but the best ad-
justment can be learned only by practice. When
the incubator is started, it takes some time to heat
up, and when the temperature rises to 100° in the
drawers, the wicks can be readjusted as found ex-
pedient. As the incubator heats up, the detent will
be lowered by the expansion of the thermostat, and
if it should be so lowered that the slot of the detent
approaches the detent arm before the temperature
reaches 100°, the regulator screw should be turned
to raise the detent higher, so that when the tem-
perature reaches 102°, the detent slot permits the
arm to pass through it.

_ The lamp wicks should be trimmed. rounding.
a

52 PREPARATIONS.

The kerosene used should be of the best quality, —

such, for example, as Devoe's Brilliant Oil, because
poor kerosene causes the rapid crusting of the lamp

f
}

)
j

wicks, and the consequent variation of the heat. If -

‘the kerosene be good, the lamps require to be trim-
med but once in twenty-four hours, and then but
slightly ; in fact, what little crust there is can be
rubbed off with a piece of paper. The quantity of
kerosene used depends greatly upon the skill of the
attendant in adjusting the wicks; but the proper
adjustment is speedily learned by practice. If, for
example, the incubator is used in a room which is
cooler during the night than in the day-time, the

lamp wicks should be turned slightly higher in the

evening than they are set in the morning,

When the incubator is first put at work by an
inexperienced operator, it should be allowed to run
several days before eggs are put into it, so that the
operator may become familiar with its management.

The interior of the incubator may be examined by
removing the top. The following operations are re-
quired for this purpose. The connecting rod (4
Figs. 7, 8), between the valve engine and ther-
mostat, must be disconnected at its lower end from
the lever V* of the thermostat, and from the valve
engine at its upper end, and must be lifted out.
The water fonts should be lifted off. The screws,
which hold the heads of the waste heat chimneys in
place, must be taken out, and the waste heat chim-
neys lifted out of the holes in the heads. This may
be readily done when the valves are open or raised,
by canting the chimney heads sidewise as they are
lifted. The thermometer must also be lifted out,

PREPARATIONS. 53

care being taken to raise with it the pieces of cork
which hold it in place. The chain and weights of
the valve engine must be drawn up and laid upon
the top of the incubator. The screws which secure
the top of the incubator may then be taken out,
and the top lifted off.

The disconnection of the connecting rod / may be
effected as follows: Apply the forefinger of the left
hand beneath the end of the uppermost lever of the
thermostat, which projects through the hole in the
end door underthe valveengine. Therod above the
lever should be seized with the thumb and forefinger
of the right hand, and should be pulled downward
and slightly outward, so as to disengage the hooked
lower end of the rod from the pivot of the lever.
When the hook is disengaged, the rod may be per-
mitted to move upward by the pull of the counterpoise
of the valve engine. Afterward, the pivot which
connects the upper end of the rod / with the shank of

_ the detent, should be removed, and while the rod is

held by the left hand, the rod should be drawn up-
ward. The rod may be replaced by reversing the
above operations, taking care that the opening of
the hook at the lower end of the rod faces toward
the end of the incubator.

When the top of the incubator is off, the dis-
tributer R should be examined for fear it may have
been displaced by transportation, although such an
accident is not likely to happen. When the dis-
tributer is in its proper position, one end of it should

_be attached to the partition beneath the evapora-

tors, and the edges of its sides should be equidistant
from the front and rear of the incubator.

:
fe

MANAGEMENT OF THE INCUBATOR.

WHEN but one incubator is employed for hatching
chickens for domestic use, it is not the best plan to _
have too many of the same age hatched at a time;
besides, when but few hens are kept, it is not always
easy to procure the requisite number of fresh eggs, of
the kind wanted, to fill the incubator at one opera-
_ tion. Hence, when starting the incubator for domes-
tic use, it is expedient to put in only about two or
three dozens of eggs, and to put in two additional
dozens every second or third day until the trays are
full.

Before the eggs are put in, it is expedient to mark
them with the date. This may be done with a pen
and ink as follows: Hold the egg in the left hand
against the rim of a table, or other support, such
as a book laid on a table, on which the Be arm is
sustained, and mark the egg thus:

MANAGEMENT. 55

The first letter may be the designation of the pen
or breed ; thus, H may designate Houdan; L, Leg-
horn; L.B. Light Brahma, etc.

The second line of letters and number denotes the
month and day when the eggs are put into the in-
cubator, say March 2oth.

The lowest letter and number denote a date three
weeks later, being the date upon which the chickens
are expected, say April roth.

The straight line between the dates Avewe the
part of the egg that is to be uppermost during the
day.

As fast as the eggs are thus marked, place them
in a shallow tray, pan, or paper box, having its bot-
tom set at a slight slant so as to prevent rolling.
When the marks are dry, take up each egg with the
left hand, and with the inscription uppermost ; turn
it over endwise between the forefinger and thumb
as pivots, so as to bring uppermost the side directly

_ opposite the inscription, and mark this side with a

single line, thus :

FIG, 10,

56 MANAGEMENT.

This line (unaccompanied by any date) indicates
the side of the egg that is to be turned uppermost
at night.

These marks render the turning of the eggs with
substantial accuracy a very easy and rapid opera-
tion ; besides always indicating the time when the
chickens may be expected, and furnishing an index »
of the state of incubation.

The incubator should be attended to twice a day ;
viz., early in the morning, and about ten or twelve
hours afterward in the evening. The attendance
in the morning should be,

1. The registration of the temperature of every
thermometer enclosed in the incubator, and particu-
larly of the highest and lowest temperatures in-
dicated by a registering thermometer, which, if not
provided with the incubator, should be placed in the
middle of one of the drawers upon two wooden
blocks, so that its bulb is about level with the upper
sides of the eggs.

2. The turning of the eggs half round, which is |
effected by opening the front or flap of each tray,
drawing the tray partially outward so that its con-
tents may be seen, and turning the stud ring on the_
middle roller until the marks upon the under sides
of the eggs are turned uppermost. |

3. The filling of the water fonts, and of the trough
of the speed controller in case water be used in it.
If oil, ora mixture of water and glycerine be used,
the trough of the speed controller rarely requires
attention.

4. The winding of the weight of the valve engine.

5. The filling and trimming of the lamps. The

MANAGEMENT. 57

advantage of doing this work last is that it obviates
the risk of having kerosene on the hands when
handling the eggs or filling the fonts.

At night, the same work is to be done with the
exception of filling the water bottles and trimming
the lamps, unless the wicks have become crusted by
the use of poor kerosene. If, however, the room is
very cool at night, or liable to become so, the lamps
should be turned up slightly higher than for the day-
time. If the registering thermometer is in a drawer
or is inside the incubator, then, about half an hour
after the drawers have been opened, the indexes of
the thermometer should be reset, unless the drawer
has been kept open so short a time that the tem-
perature at closing it is between 100° and 103°, in
which case the indexes may be set at once.

When trays are used which are not provided with
means for turning the eggs simultaneously, the eggs
should be turned by hand as rapidly as practicable,
commencing with the eggs that are nearest the back
of the drawer or tray ; and, as the work proceeds,
the tray should be progressively shoved in. In fact,
the less the drawers or trays are opened, and the
shorter the time during which they are kept open, the
more equable will be the heat, and the less will the
operation of incubation be affected. As the ventila-
tion of the thermostatic incubator is automatic and
practically perfect, it is unnecessary to expose the
eggs to cool air by keeping the drawers open, unless
some accident has occurred which has caused the
overheating of the eggs.

The valve-engine should be oiled occasionally, say
about once a week. This operation is performed

58 MANAGEMENT.

most readily by means of a piece of broom corn, or
a piece of fine wire, the point of which is dipped
into a vessel of oil. The minute drop, accumulated
on the point of the instrument, is applied in succes-
sion to each bearing of each shaft; and the face of
the detent and the ends of the two detent arms of
the main shaft also should be oiled by touching them
slightly with the point of the finger slightly
moistened with oil, as all that is required is a greasy
surface; the detent being held by the left hand
during the operation of thus greasing its face. The
pivots of the chain pulleys of the weights should
also be oiled occasionally. So long as the bearing

surfaces of the engine and pulleys do not become
dry, the less the quantity of oil used the better will
be the result. The engine will run frequently
several weeks without reoiling; but if a bearing
should happen to become dry and stick, the incuba-
tor would cease to regulate, and the eggs might be
spoiled, unless the difficulty should be discovered in
time. Hence it is better to oil the engine at least
once, or even twice, a week, applying the oil as
sparingly as possible, and wiping off any surplus
with a soft rag on the end of a small stick, than to
run any risk of dryness.

It is possible that the temperature in the egg
trays which are furthest from the lamps may run
lower than that of the egg trays which are nearer
the lamps. This contingency is most likely to occur
in hot weather, when from the approximation of the
temperature of the atmosphere to that of the in-
terior of the incubator, the draught becomes slug-
gish. If there should bea greater difference than

MANAGEMENT. 59

one degree between the mean temperatures in the
farther and nearer trays, the matter should be reme-
_ died, which is readily done by increasing the length
of the ventilating pipe so as to cause the warm air
to traverse the incubator more rapidly. Such a
larger ventilating pipe of galvanized iron, roofing
tin, or zinc may be procured of any tinsmith. Or, a
much better pipe may be made by rolling a sheet of
common wrapping-paper or of thin pasteboard upon
a wooden roller or core two and a half inches in
diameter, and pasting all but the inside layer as the
rolling progresses. After the paper becomes dry,
the pipe should be slit longitudinally with a pen-
knife to enable it to be removed from the wooden
core, and should then be enveloped in several
layers of a sheet of paper covered on one side with
paste. The paper pipe should subsequently be
_ varnished.

If the temperature of the room does not exceed
70°, supplementary ventilation through the valve
opening of the valve Z’is unnecessary, and the valve
may be temporarily rendered inoperative. This
may be readily effected by making a cone or cornu-
copia of paper and pushing it point downward into
the valve opening, thus closing it, but permitting
the valve to be raised and lowered regularly by the
operation of the valve engine.

About the sixth or seventh day after each lot of
eggs is put into the incubator, they should be ex-
amined by means of an egg tester, and such as are
clear should be set aside, as they are not fertile.
These unfertile eggs may be boiled at once, and
kept for feeding the young chickens. Sometimes

60 MANAGEMENT.

an unfertile egg may escape detection, and it is also
possible that a partially developed chicken may die
in the shell ; hence two days before the eggs are ex-
pected to hatch they may be tested by placing them
gently, a few at a time, ina large bowl or in a bucket
of water heated to 104°. Ina short time the eggs
which contain live chickens will commence to bob
about. The eggs which sink are addled, and those
which float without bobbing are either addled from
being originally unfertile, or contain germs which
have progressed to a certain point and have then
died. After the eggs have been tested, the live
ones should be replaced in the incubator. |

After the last testing of the eggs, they should
be placed in trays or drawers having bottoms of | |
perforated metal (two of which are furnished with —
each of the author's incubators) which should be
inserted in the incubator in place of the roller
drawers, so that the chickens will have a good sur-
face to stand upon when they emerge from the
shells. From the time the eggs are placed in these
hatching trays until the chickens peck the shells,
the eggs should be turned twice a day by hand.

Or, if preferred, the eggs may remain upon the
rollers while the chickens come out of the shells.
In this case the chicken drops between the rollers,
and will be found under the egg tray, and on the
bottom of the incubator. The only objections to
this course are that the chicken may possibly be in-
jured in passing between the rollers, and that the
rollers and bottom of the incubator are made dirty

by the membranes from the eggs andthe droppings

of the chickens, In such case the rollers should be

MANAGEMENT. 61

cleaned before fresh eggs are put upon them ; and
coarse paper should be placed on the bottom of
the incubator to receive the foul matter, the paper
being occasionally changed.

When the shell of an egg is pecked, the pecked
side should not be turned downward, for if this be
done the chicken will sometimes be smothered by
the moisture of the inner membrane of the egg. A
pecked egg should be so turned that the pecked
part is at the right or left side of the egg. When
the chickens are hatching, the eggs should be far
enough apart endwise, say at least three quarters
of an inch, to allow the chickens to stretch them-
selves out of the shells ; and the chickens should be
left in the tray not less than six hours, or until their
feathers become dry ; the egg shells being removed.
The chickens may remain in the incubator twelve
hours or even twenty-four hours without harm, and
often with advantage, although sometimes one will
make his way over the top of the tray, and will be
found on the bottom of the incubator.

_ Sometimes a chicken pecks the shell, but from
some malformation, or lack of vigor, or from mis-
placement of the head, is unable to peck a crevice
sufficiently round the egg to enable the shell to part.
Cases of this kind have never occurred with the
author unless the parents were too closely related or
too old. When they do eccur, the chicken will die

unless relief be afforded by opening the shell by

hand. As, however, this operation must be per-
formed with great delicacy, in order that the chick
may not be wounded, great care must be exercised ;
and even then the result will probably be unsuccess-

bi
q
.
i

62 MANAGEMENT.

ful unless the operator is a practised hand. There
are two ways of operating in such a case, one or the
other of which may be preferable according to
circumstances. If the chicken has already pecked
the shell, the operator may crush the shell from the
pecked opening around the egg in a ring, by means
of his thumb nail, and he may then tear the mem-
brane surrounding the chick. If the chick has not
pecked the shell at the close of the twenty-second
day, the shell may be opened, by means of a sharp-
pointed implement, at about the distance from the
large end at which the shell is usually pecked. The
best implement forthe purpose is the point of a
pen-knife or the point of the tang of a small file.
The point of the instrument should be engaged in
the hole of the shell to the least possible extent and
be pryed outward so as to break out a minute piece
of shell. By a succession of such operations, a ring
crevice can be formed which, upon breaking the
membrane, will permit the chicken to escape.
Sometimes chickens are weak in the legs when
first hatched, so that they cannot stand upright even
at the end of five or six hours, but lay on their bel-
lies with their legs sprawled out sidewise. This weak-
ness generally arises from too close in-breeding, as we

- have never noticed it in chickens that are from parents

which are not related, or are but distantly related.
Such chickens generally die when hatched by a hen ;
and when they are hatched by an incubator they
will not generally be of any value if left without
treatment. The trouble can be readily cured by
connecting the legs loosely by means of a piece of
soft cord or woollen yarn. The easiest way to

MANAGEMENT. 63

manage the matter is to let one person hold the
chicken with its belly upward, while another does
the tying. A separate piece of yarn is tied loosely
around each leg, below the hock joint; then the
long ends of the two pieces are tied together, leav-
ing the hock joints about three quarters of an inch
apart. After the tying is completed, all the loose
ends of the yarn should be cut off with a scissors to
within a quarter of an inch of the knots. Chickens
treated in this way are able to walk and get their
food, and after a few days they become so strong
that the yarns may be cut off.

If ordinary care be exercised, a bad egg need
never be broken in the incubator, because before
such eggs burst, they either smell badly, or they
exude beads of matter through the pores of the
shell, or their shells split longitudinally without
breaking the membrane within. Hence, if the eggs
are looked at morning and evening, and the operator
has a sensitive nose, an addled egg can generally be
detected and removed. If, however, an egg should
be broken, such eggs as have been spattered by the
contents oi the broken one should be at once
washed in lukewarm water containing a few drops
of carbolic acid. The egg tray should be opened
sufficiently to hold a pan under the place where the
egg broke, and water containing carbolic acid should
be poured through the perforated bottom or upon
the rollers of the drawer so as to cleanse them
thoroughly. The bottom of the incubator also
should be washed with water containing. carbolic
acid, a sponge being used for the purpose.

If by reason of any accident the heat should rise

64 MANAGEMENT.

as high as 108°, all the drawers or trays should be
taken out and set upon the floor until the heat falls
to go° or 95°, and should then be replaced. If the
excessive heat has not lasted for too long a period,
a heat considerably higher than 108° will not be
fatal. Thus, in the course of the author’s experi-
ments with different arrangements of valve engines
and thermostats, the heat on one occasion ran up to
120°, and must have been in the vicinity of that
temperature for nearly an hour; yet nota single egg
had its vitality destroyed, although the incubator
contained eggs in all states of incubation ; the prob-
able reasons being that the ample supply of moisture
and fresh air enabled the germs to withstand the
excessive heat for a short period without destruction
of life ; and that as the contents of an egg are bad

conductors of heat, the heat within the egg was.

materially lower than that of the incubating
chamber. ,

When the work of incubation is completed for the
season, the fonts should be removed and the water
should be withdrawn from the evaporating pans by
means of a syphon, the short leg of which is inserted
through the holes forthe font nozzles. If water con-
taining mineral salts be used for the water fonts, the
incessant evaporation will produce a deposit in the
evaporating pans, which would be very injurio us.
The only mode of removing this is to take off the
top of the incubator so that the pans may be got at
and cleansed. Any rough substance, such as an
oyster shell, inserted in the evaporating pan will tend
to induce the deposit of the salt upon it ; hence it
is a good plan to keep an oyster shell in each evap-

MANAGEMENT. 65

orating pan if impure water be used. The better
plan, however, is to use only clean rain water for
_ filling the water fonts, as this is free from all mineral
salts.

The size of lamp burner which is sete with the
incubator depends upon the temperature of the recom
in which the incubator is used, and should be
changed, if found expedient, as directed under the
head of ‘‘ Construction.”’

The milled regulating nuts previously described
upon the upper end of the rod / for adjusting the
operation of the thermostat, or the adjusting screw
H, require occasional adjustment. If in the proc-
ess of progressive adjustment it should be found
necessary to screw the milled nuts very near to the
upper end of the rod, it would be better to slightly
screw up the adjusting screw H at the end of the
incubator rather than to screw the milled nuts on
the adjusting rod / too high. |

It is a remote possibility that the atmosphere of
the incubator may not be sufficiently moist to enable
the eggs to hatch properly. If, therefore, the heat
has not been excessive, and fertile eggs should not
hatch, it would be well to ascertain whether the
trouble is due to want of moisture. This may be
done by sprinkling the eggs in the drawers with
warm water, after the eggs have been turned. If
this water does not dry within half an hour after the
drawer is closed, the fault is not want of moisture.
If the water dries rapidly, the sprinkling may be
continued once a day, or both morning and evening,
without risk, and the result noted. If, thereafter,
the eggs hatch better, the difficulty has been want

66 MANAGEMENT.

of moisture. During hatching eggs will bear a great

deal of moisture without injury ; thus the author

has immersed eggs in water for three quarters of
their length; the eggs being sustained upright,
with their large ends uppermost, in cellular water
trays placed in the incubator, and being kept
in the water until the nineteenth day, after which
they were put in dry drawers ; and the eggs hatched.
If, however, there be so much moisture in the at-
mosphere of the incubator that it condenses upon
the shells of the warm eggs and forms a film of
water thereon, the pores of the egg shell will be
closed and the germ or partially developed chick

will be suffocated; the death of the egg being

generally followed by the longitudinal splitting of
the shell from end to end. If, therefore, such split-
ting of the shell takes place with an egg which has
previously been proved to be fertile, and the incu-
bator has not been overheated or has not been too

cold, the presumption is that the moisture is in ex-

cess in the incubator, and the sprinkling of the eggs
should be reduced or discontinued.

Every egg that has been adjudged to be fertile
after being tested in an egg tester, and that does

not subsequently hatch, should be removed on the

twenty-second day and opened for the purpose of
ascertaining whether its want of fertility escaped
detection or the chick has died subsequently to ex-
amination. As such eggs are sometimes offensive,
the better way to open them is to drop them upon
the ground at arms’ length, so that they do not spat-
ter the operator.

The temperature of the incubator may be adjusted

MANAGEMENT. 67

to suit the views of the operator, by means of the
adjusting screw and the nuts of the rod 7. Accord-
ing to the author’s experience fertile eggs will hatch
with certainty when the highest temperature re-
corded by the thermometer supplied with the
incubator does not exceed 102° F., and the tempera-
ture when the incubator is working regularly does
not run down regularly below 98°. The tempera-
ture at the level of the tops of the eggs may, how-
ever, run up to 106°, without material risk. If an
examination of the thermometer shows that the
temperature has exceeded 102°, it has been the
author’s practice to adjust the mechanism to open
the valves sooner ; a maximum temperature of 103°
or 104° at the upper sides of the eggs being suffi- |
cient.

The larger the number of eggs in the thermo-
static incubator, the more regularly will it run as
respects temperature ; and when it contains its full
complement of eggs the temperature of the atmo-
sphere within it, when the drawers are closed, will not
vary more than 4° as indicated by the thermometer.
Under such circumstances the variation of the tem-
perature of the interior of an egg must be very
minute. As the presence of a large number of eggs
in each drawer or tray tends to keep the tempera-
ture more uniform, it is a good plan, when a tray is
not at least half full of eggs, to put into it a quan-
tity of porcelain eggs, and to remove them as the
space is required for fresh eggs; or to increase the
number of porcelain eggs when fresh eggs are not
supplied as fast as chickens are hatched, which is
frequently the case toward the close of the hatching

68 MANAGEMENT.

season, when the incubator is employed to hatch
chickens for family use.

Whether the incubator operates successfully or its
use ends in disappointment, it is expedient that a
record of every proceeding, incident, and effect
should be kept; for by this means alone is one
able to reconsider the work and to ascertain what
was needed to have insured success. _ Every opera-
tor will naturally have his own peculiar views as to
the form of his journal. The author has found it
convenient to use one divided by upright lines into
columns in which are entered on the same horizontal
line, the date ; the hour of observation ; the highest
and lowest temperatures of each tray as indi-
cated by a registering thermometer ; the temper-
ature of the room in which the incubator is oper-
ated ; the temperature of the vent pipe for foul
air; the number and kinds of eggs put in; the
number and kinds of eggs removed as unfertile ;
and the number and kinds of chickens obtained.
A note also is made of any unusual occurrence,
such as the resetting of the regulator.

_ In addition to the thermometers above mentioned,
it is expedient to have one whose bulb is inclosed
in a small tin cylinder of about the same capacity as
an egg, the residue of the cylinder being filled with
glycerine. The cylinder should be set in one of the
drawers on a level with the eggs. The indications
of such an enclosed thermometer afford a close ap-
proximation of the internal temperature of the eggs.

THE CHICKEN: NURSERY.

IF proper means be provided, chickens hatched
by an incubator can be raised with less expense and
trouble, and with less loss, than chickens under the
care of hens. This statement is not a speculation,
but is the result of the author’s experience, and of
a comparison of seven years’ hatching and raising
by hens, with seven years’ hatching by means of an
incubator, and raising by means of brooders an aver-
age of 250 chickens and 4o ducks annually, which is
the number required in his family for the larder and
for replacing the old stock. The requisites for rais-
ing chickens artificially are warmth, ventilation,
cleanliness, exercise, green food, and the separation
of chickens of different sizes into classes, so that the
younger or smaller are not trodden and maltreated
by the larger.

In order that the requisite warmth may be sup-
plied, various contrivances called ‘‘ artificial moth-
ers’ have been devised ; but this term is a misno-
mer, as the most essential functions of the hen are
not performed, while the name brooder is much more
appropriate in view of the purposes for which the
devices are employed. The ordinary artificial
mothers consist of an inclined board having its
under side lined with flannel or sheepskin, enclosed
at the ends and at its lowest edge, and set upona
floor. These, however, will not answer if the

7O THE CHICKEN NURSERY.

weather be cool. Artificial mothers are now fur-
nished by manufacturers in which the inclined board
is replaced by a water heater, through which a lamp
flue is conducted ; and the heat is furnished bya
kerosene lamp. The author found that such artifi-
cial mothers were not sufficiently ventilated. Hence
he devised a new kind of brooder in which the floor
under the inclined board, or brood-cover, is of per-
forated metal, and heat and ventilation are simul-
taneously supplied by a slow current of air which is
warmed by a lamp, and rises through the perforated
floor. A primary brooder made on this plan is rep-
resented at Figs. 11, 12 and 13; Fig. 11 being a
side view of it ; Fig. 12 being a central longitudinal
section of it; and Fig. 13 being a top view with the
brood-cover removed. The brood-chamber A of
this brooder is enclosed between the brood-cover E
andthe floor G; about half of the floor being of
wire cloth or perforated tin supported upon a mov-
able frame a. Beneath the perforated floor is a hot-
air chamber C, which is supplied with air from a
lamp case D, beneath. The hot gases from the lamp
chimney pass through a flue 4 in the hot-air cham-
ber, and escape at the sides of the brooder. The
flue is partially covered by a curved piece of tin
plate #, to protect the lamp chamber beneath from
dirt, and to distribute the hot air more equably.

The lamp has a kerosene burner of the smallest

size, and the wick must be kept down low, as very
little heat is sufficient to raise the temperature under
the brood-cover to 90° F., which is as hot as it
should be when the chickens are beneath it ; while
if the temperature be kept too high, the chickens

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72 THE CHICKEN NURSERY.

will sicken. The under side of the brood-cover
should be lined with some soft material ; and those
which the author has found best are two-ply ingrain
carpet and blanket, either of which should be arrang-
ed in flutes, and secured to the brood-cover by rows
of carpet tacks. The brood-chamber A is connect-
ed at its highest side with a small enclosed run B,
open at the top, but provided with grooved slides
for glass. The run should be partially covered with
glass in cold weather, and in warm weather with a
piece of wire net. During cold nights a cloth may
be partially drawn over the brooder, but a portion of
the top of the run must always be left open for ven-
tilation. The opening between the brood-chamber
and the run may have a piece of worsted fringe tack-
ed along it ; this preserves the warmth in the brood-
chamber, while permitting the passage of sufficient
air for ventilation ; and it is surprising how quickly
the chickens learn to run through the fringe.
Chickens immediately after being hatched are
thoroughly exhausted by the efforts required to dis-
engage themselves from the egg shells. They
therefore require heat and rest, which are given by
permitting them to remain in the trays of the incu-
_bator until their feathers become dry, or certainly
for six hours. They do not require any food, and
will rarely take any, until the day after their birth.
They may then be placed in the primary brooder and
food given to them, water being supplied by a font
H at the end of the run. Sometimes one chicken

will eat immediately ; if this be the case, all difficulty —

is over, because the pecking of food by one will
teach the others to feed. If no one of the first lot

° oo nT

THE CHICKEN NURSERY. 73

pecks the food, they must be taught to do so by
crumbling the food before them and tapping the
floor with the end of the finger nail. When one is
taught, it acts as a schoolmaster for all the others ;
and when chickens are hatched successively, a few
of each old brood should successively be left in the
primary brooder to teach the newly-hatched chicks
both to feed and to run into the brood-chamber for
warmth. The use of the brood-chamber has to be
taught the first chickens by putting them under the
brood-cover by hand ; but they speedily find how
comfortable it is, and the first chickens teach all the
others, on the principle of the well known game of
** follow your leader.’’

When the chickens become four or five weeks old,
they should be removed to a secondary brooder, and
subsequently to a third. The last two may be ar-
ranged on a level with the floor of a small house,
which forms enclosed runs; a pit being made be-
neath the brood-chambers for the lamp case. One
kerosene lamp with a burner of small size is suff-
cient to heat two such brooders each four feet broad.
If, however, the establishment be large enough to
make it advisable to use a hot water or steam heat-
ing apparatus, a hot-water pipe or a steam pipe may
be passed through the air-chamber under the brood-
er; a few small holes being made in the bottom
of the chamber under the pipe to admit fresh air.
In such cases the lamp and its enclosure are super-
seded, and there is then no necessity for making the
pit deeper than is sufficient to hold the hot-air cham-

ber.

The chicken house or nursery, used by the au-

74 THE CHICKEN NURSERY.

thor for raising about 250.chickens annually, is rep-

—*

resented in cross section at Fig: 14 and in plan at —

Fig. 15 ; and itis large enough for 400 chickens, pro-
vided they be hatched in successive broods. It has
a roof sloping to the south, and formed in two
pitches #, 7. The first pitch 4 is quite steep, and is
formed alternately of hot-bed sashes six feet by three
feet, and of solid panels six feet by three feet, made
of boards battened at the seams. The second pitch
zis nearly flat, and is formed alternately of scuttle
doors and fixed board panels, each three feet wide.
The scuttle doors are hung on hinges at one edge,
so as to open upward, and they are fitted with green-
house lifting irons (Fig. 16), so that the sashes may be

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THE CHICKEN NURSERY. 75

raised and held open for ventilation. The low side
of this nursery does not exceed two and ahalf feet in
height ; while the longitudinal plate on which the
upper ends of the sashes are supported is only six
feet high; and the highest side wall is seven feet.
These heights make the space under the roof high
enough for any practical purpose, because the por-
tion under the second pitch is high enough to permit
an attendant to walk upright, and it is necessary to

\\\\

F1G. 16.—SCUTTLE Door.

pass beneath the lower pitch of the roof only when
the house is cleansed or the brood-covers are remov-
ed ; and then one naturally stoops to do the required
work, so that a greater height is unnecessary. This
nursery is divided into three sections A, B, C’ (Fig.
15) of unequal sizes, the division being made by wire
net partitions fitted with plain battened doors a, 3.
The rebates for the doors are made by nailing strips
_ upon the posts. Each door is fitted with a cord,

NURSERY.

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——
——

THE CHICKEN NURSERY. 77

weight, and pulleys, so that it is self-closing. The
wire net and the doors do not extend down to the
floor, but terminate at cross bars m, about ten
inches from the floor. Removable board shutters
are applied to the spaces under these cross bars.
The smallest section A is the secondary section, for
chickens discharged from the primary brooder.
The central section B is appropriated to the largest
sized chickens that require a brooder ; and the largest
section C is used for chickens large enough to perch,
and is fitted with movable perches set fifteen inches
above the floor. The brood-chambers F, F of the
secondary and central sections are arranged back to
back overa pit represented in dotted lines in the
section. This pit is lined with rough hemlock
boards nailed to studs, and it is entered by steps
covered witha flat door K. The pit contains the
hot-air chamber, and the lamp case beneath it, and
access is had to the lamp by a door in the side of
the lamp case. The double brooder is represented
on a larger scale, and in section at Fig. 17. The hot-
air chamber for this brooder is represented in plan
at Fig. 18. ‘The gases from the lamp chimney pass
through a pipe 7 which is bent in the form of a
square ring, and the gases escape through a vent
tube z. The hot-air chamber is covered with two
frames aa, Fig. 17, on which perforated metal is
tacked to form the perforated floors for the brood-
chambers ; and the front of each brood-chamber may
be enclosed by worsted fringe 72.

The under side of each brood-cover is lined with
ingrain carpet tacked in flutes so as to form a series
of inverted. U-formed cells or channels, A A’. The

aN
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THE CHICKEN NURSERY.

——_BROODERS.,

Eye. 76:

THE CHICKEN NURSERY. 79

floor of the nursery is formed of earth raised about
an inch above the natural surface, well rammed and
plastered about an inch thick with cement mortar ;
the earth having been permitted to dry thoroughly
before being plastered. The floor is covered with
coal ashes, some of which is greedily eaten by the
_ young chickens, and the same material is sprinkled
over the floor of the primary brooder. This last is
supported about breast-high upon a pair of rails
_ nailed to the posts of the secondary section A, so
that the establishment constitutes a complete nursery
for chickens from the earliest age to adolescence.

The secondary and central sections of the nursery
communicate with yards (D and E) by means of flap
doors (¢ and g), so that the chickens can be allowed
to run out in fair weather. The fences of the yards
are made of hemlock boards for two feet in height,
the edges of the bottom boards being sunk a little
in the earth so as to prevent the escape of chickens ;
while the rest of the fence is made of small meshed
wire net.

As the chickens grow, they are transferred from
the primary brooder to the secondary section A ;
thence to the central section B; and from it to the
finishing section C, which communicates by a hole
under the front door d, with a large grass run of
two acres. About once a day a few spadefuls of
the soil of each yard are dug up to furnish fresh earth
_ for the young chicks to scratch in.

_ The whole nursery is made of common ten-inch

boards, machine planed, and nailed to posts planted
inthe ground. The lower ends of the posts up to
six inches above the ground were given two coats of

SO THE CHICKEN NURSERY.

coal tar dissolved in crude petroleum, and applied
with a brush while hot. This preparation strikes
into the wood rapidly, dries at the surface, and
renders the wood proof against rot for many years.
The seams between the boards of the roof are bat-
tened and the walls are lined with tarred felt. The
space over the large double brooder is enclosed with
removable frames covered with wire net to keep the
chickens from the top of the brood-covers. Each
brood-cover is fitted. with a common iron trunk
handle, so that it can be readily lifted and removed
to enable the perforated floor to be cleansed.

This nursery was made long and narrow because
it was convenient to build it along a division fence,
the posts of which were incorporated in the back
wall of the building. If space could be conveniently
obtained, it would be better to make the building
of double the width and about half the length; say
21 feet long by 16 feet broad; and to give the roof
a double pitch in opposite directions from the
central line. The ground plan and perspective view
of a nursery of this description are given at Figs. 19
and 20. The two brood sections A, B, occupy half
of the building at one side of a central longitudinal

- partition, and the finishing section C occupies the

other half. The doors a, 8, of the first two sections
open into the finishing section C, which forms the
passage to them. The door & to the pit of the
double brooder is an upright door in the main parti-
tion. The yard D for the secondary section may be
at one side of the building; and the yard E, for the
other brood section, may be at the rear end. The
front door may be at a. If wire net cannot be ob-

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i
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Tl . i . a iM

82 THE CHICKEN NURSERY.

tained for the partitions, or is deemed too costly,
seine net, such as is used by fishermen and is made
by machinery at a low cost, may be employed. Or,
laths three quarters of an inch broad by half an inch
thick may be employed. These can be procured
from any manufacturing builder who has a small cir-
cular sawmill; and if they are not dressed smooth
at the edges, partitions made of them cost consider-
ably less than when made of wire net.

The materials required for the double pitch nurs-
ery are as follows :

8 posts, each g feet 6 inches long.

10 posts, each 8 feet 6 inches long.

16 posts, each 5 feet long.

IO joists, 2 X 4 X 13 feet for plates on posts.

8 joists, 2 X 4 X 13 feet for rafters of first pitch.

3 joists, 2 X 4 X 13 feet for partitions.

66 pieces of novelty siding, 5 inches wide by 13
feet long. : :

38 boards, 10 inches wide by 13 feet long (faced
on one side) for the roof and the scuttle doors.

7 boards for internal doors.

7 hemlock boards 16 feet long for pit.

450 running feet of batten moulding for roof.

150 square feet of net, or 75 laths 3? X } X 13 feet.

12 pairs of butt hinges, 3 x 3.

2 barrels of cement for floor.

The posts may be made of 2 X 4 joists, in which
case there will be required 18 of 2% 4° aggeee
long for that purpose.

Instead of having a single yard for each of the first
two sections of the nursery, it is better to have two
yards for the secondary section A, and two for the

NURSERY.

THE CHICKEN

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er

84 . THE CHICKEN NURSERY.

central section B. The chickens can then be allow-
ed access to each yard in alternate succession, say
two weeks to each. This plan is advantageous,
because it obviates the danger of the yards becom-
ing foul from excessive use. It is also advantageous
to have a few bushes in the yards for shade in hot
weather, one of the best plants for this purpose
being the common sumach.

The yard for the secondary section should contain
not less than 600 square feet of surface ; being, say
21 feet wide by 28 to 30 feet long; or two yards
each of half this size may be used. The yard for
the central section should be double the size of that
for the secondary section. Ifthe yards are too small,
they become foul before the close of the hatching
season, and the later chickens droop. If this should
occur, either fresh ground must be provided, or the
ground of the yards must be spaded over immediate-
ly, so as to bury all fou! matter and thus disinfect
the yards. In such case, however, the chickens
must be supplied twice a day with fresh green food,
and all that is not consumed must be either dug
under or removed. As soon as the youngest
chickens can be turned out of the yards, it is a good
plan to spade over the whole ground, and to sow it
~ at once with grass seed. The first rains cause this
to sprout, and thus a fine plot of fresh grass is pro-
vided for the next year.

With a low-priced classifying nursery, such as
either of those above described, there is no difficulty
in raising chickens, if proper food be given them and —
the place be kept clean. If they are hatched too
early for grass, lettuce should be raised under cold

REM

THE CHICKEN NURSERY. 85

frames to supply them with green food ; because,
although they will get along very well for three or
four weeks without green food, yet as they grow it
becomes a necessity ; and if it be not provided, they
get a species of cholera infantum and die off. If
proper food be supplied and ordinary care be taken,
much fewer casualties occur than with chickens
brought up by hens, and the labor of taking care of
the same number is much less. Young chickens
must have some animal food, and nothing is better
for the purpose than the unfertile eggs taken from
the incubator. These should be boiled hard at
once, so that they will keep until wanted, when they
should be chopped fine and mixed with Indian meal
or oat grits slightly moistened so as to be crumbly.
A common coffee-mill should be screwed fast to
one of the posts of the nursery for the purpose of
cracking refuse wheat, so that a pan of coarsely
cracked wheat may be continually kept within reach
of the first two classes of young chickens. The
quantity they will consume of it, even when other
food is furnished in abundance, is surprising, and
it appears to have a favorable effect upon their
digestive organs. The chickens after leaving the
primary brooder may be fed with what is commonly
called ‘‘ feed” mixed stiff with a little water, and
containing a little bone meal ; or with a mixture of
equal parts of corn meal and wheat bran, mixed in
the same manner, care being taken to feed no more
at any one time than they will eat up clean before
the next feed is given. They should also have free
access (as they grow larger) to cracked or whole
light wheat in a feed hopper, or toa mixture of

86 THE CHICKEN NURSERY.

wheat and cracked corn. Occasionally a small quan-
tity of animal food finely chopped should be given
them, and a supply of clean water must be provided.

To raise chickens artificially with success there is
one condition that is indispensable, and that is clean-
liness ; for however much care be taken to supply
proper food and warmth, young chickens will sicken
and die unless their quarters be well ventilated and
be kept clean. The ventilating brooder invented by
the author supplies fresh warm air continually to
the chickens under the brood-cover. The perforat-
ed floors of the brood-chambers should be brushed
off daily with a whisk, and it is expedient to remove
the brood-covers every morning for this purpose,
and also because it is possible that a chicken may be
trodden to death during the night ; although such a
casualty rarely happens unless the chicken be sick.
The daily cleansing of the brood-chambers is impor-
tant, as it is bad enough for chickens to remain all
night in the effluvia of their fresh droppings ; and
the sanitary conditions may be imagined when the
droppings are permitted to accumulate for several
days in the moist warm air under a brood-cover.
Occasionally the linings of the brooders should be
sprinkled with carbolic soapsuds or with a weak so-

- lution of carbolic acid in water, and the perforated —

floor should be taken up and scraped, and: then
washed with the same material. After such sprink- .
ling, the brood-cover should be exposed to the sun
or be well aired, so that it may be dry before it is
put in place. While the drying is being effected, |
the chickens should be kept from the brood-chamber
by a piece of board. The floors of the run of the

THE CHICKEN NURSERY. Oe

primary brooder and of the nursery should be cov-
ered with either fine coal ashes, or dry earth, the
former being preferable, and fresh material being
occasionally added; ashes which have been sifted
through a stone mason’s sand screen, or a wire cloth |
sieve of a quarter of an inch mesh, are quite fine
enough, as the small fragments are an advantage,
they being cracked and eaten by the young chickens.
The floors of the primary brooder and of the nurs-
ery should be raked over frequently with a fine-
toothed rake, and the droppings and foul ashes re-
moved. A good instrument for such raking may be
made by driving a row of two-inch wire nails half an
inch apart and half an inch deep into a strip of
wood, clipping off the heads of the nails evenly with
a cutting pliers, and fitting a small handle to the
rake head so made. If lettuce or other cut. green
food be used, the wilted stalks and remnants should
be regularly removed, as they tend to produce sick-
ness. All stale mixed food should be removed for
the same reason before fresh food is supplied. Ifa
chicken be sick, it should be removed from the others
at once and kept in warm quarters untilwell. With
ordinary care, cleanliness, and a supply of proper
food, sickness will rarely occur; but it isa good
plan to have a spare primary brooder on hand, so
that if'a chicken does sicken, it may be transferred

to it and kept warm until well.

A good chicken nursery is essential to the raising
of chickens artificially ; and unless one be provided,
it is practically useless to make the attempt, how-
ever costly an incubator be procured.

THE HATCHING SEASON.

THE thermostatic incubator furnishes the means
of hatching chickens throughout the year, but there
are certain peculiarities of the seasons in our North-
ern and Midlde States which do not render this
course generally expedient. In order that young
chickens may thrive, they must have warmth,

plenty of exercise in the air, and green food.
- Plenty of exercise necessarily implies a large run,
and such a run can be obtained in cold weather
only by covering a large surface with glass. Per-
sons who have cold graperies may use them with
great advantage as runs for early chickens; but
those who do not possess such luxuries, and cannot
afford the cost of a suitable building for an enclosed
run of several hundred square feet, must content
themselves with hatching chickens at seasons when
those which area month old can run out of doors
without risk. On the other hand, the excessive
heat of July and August is not favorable to the
bringing up of very young chickens, and besides,
the season is then so far advanced that unless the
chickens are wanted for late broilers, they are not
sufficiently advanced by the time winter sets in.
Under these circumstances it is generally inexpedi-
ent in the Eastern, Northern, Middle, and Western
States to start the incubator before the Ist of Feb-
ruary, or to continue its use much after the Ist of

THE HATCHING SEASON. 89

July. If started in February the season is generally
sufficiently advanced to permit the chickens to run
out in enclosed yards for several hours daily by the
time they are old enough to be transferred from the
primary brooder to the floor of the nursery. The
enclosure of the yards with boards fora height of
two feet, makes a shelter against cold winds, so that
the chickens do not suffer as they would do without
this protection ; but, even with this advantage, the
chickens at first should not be allowed to run out

“except in fine weather, and should be called in long

before sunset. If young chickens be called or whis-
tled to whenever they are fed, they speedily learn
what the sound means, and can be called in at any

time by the same sound. They should be called |

and fed on damp food at least three times a day,
and should have green food and crushed grain to
peck at between feeds. With such treatment and
cleanliness they will grow rapidly and will outstrip
in size and vigor chickens raised by hens with the
ordinary treatment.

‘There is another consideration which renders it
inexpedient to commence the incubation of eggs in
this latitude too early in the season. The eggs
which are laid in the winter are laid almost exclu-
sively by pullets of the preceding spring, and these

are frequently unfertile. Thus, in February the

author has frequently found three quarters of the
eggs laid by pullets to be unfertile. As the season
progresses, the proportion of fertile eggs increases,
until in April nine tenths of the eggs will be fertile.
Sometimes, however, cocks and hens show strange
vagaries in mating, particularly when a single cock

gO THE HATCHING SEASON.

is kept with several hens, the cock mating with
some one or more hens, and refusing to mate with
others, unless the favored hens be removed tempo-
rarily. Thus, in one instance noticed by the author,
a cock was placed with seven pullets. The eggs of
only two of these proved to be fertile. These two
were removed, whereupon the cock mated with the ~
remaining five, and their eggs all became fertile. In
another case, three Houdan pullets hatched from a
sitting of eggs procured from a noted breeder were
placed in December with a Houdan cock one year
older than the pullets, and four Brahma hens were
also given him. In due season the pullets began to
lay, but not one of the eggs proved to be fertile.
After several weeks the Brahma hens were taken
away. It was then noticed that the eggs of but one
of the pullets became fertile, and she had to be
taken away temporarily before the cock would mate
with the other two. This caprice or vagary in mat-
ing probably explains the fact that eggs purchased
in the spring of the year from the most respectable
breeders are frequently unfertile, particularly if the
females of the breeding pen consist partially or
wholly of pullets. Thus, on one occasion the author
purchased a sitting of eggs from a noted breeder,
_and only four of the eggs proved to be fertile, the res-
idue remaining clear, although placed in the incuba-
tor side by side with the others. In another case
eight fresh ducks’ eggs given to the author by a
friend proved wholly unfertile, while the eggs of
ducks kept by the author and put into the incubator ©
at the same date and side by side with the others all
proved fertile. The above facts are important as

THE HATCHING SEASON. gi

showing that the failure to hatch eggs is not. neces-
sarily the fault of the incubator, but is frequently
due to other causes. In fact, when the eggs are put
under hens, it is a very common circumstance to hear
complaints to the effect that the eggs hatch badly,
or that the owners have bad luck, particularly when
the hens are set early in the spring. ©

If the breeding stock is kept in flocks containing
several cocks, the absence of fertility is not so apt
to occur, because the weaker cocks will mate with
hens or pullets that are not appropriated by the
stronger cocks.

Fi.

APPENDIX.

CLAIMS of United States patents granted to
E. S. Renwick.

Patent No. 193,616, dated July 31st, 1877.

Improvements in incubators.

1. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holders, the heat-flue, and
the waste-heat chimney. |

2. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the heat-flue, the
waste-heat chimney, and the chimney-valve.

3. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder, and the air-pipe ar-
ranged to supply air into the upper part of the incubating-
chamber.

4. The combination, substantially as before set forth, of
the incubating-chamber, the holder, and the ventilating-
chimney arranged to discharge the air from the lower part
of the incubating-chamber.

5. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder, the ventilating-chimney
arranged to discharge air from the lower part of said cham-
ber, and the ventilating-valve which regulates such discharge.

6. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the ventilating-chim-
ney arranged to discharge air from the lower part of said
chamber, and the air-supply pipe arranged to supply air to
the upper part of said chamber.

O4 APPENDIX.

7. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder, and the water-tray ar
ranged in the upper part of said incubating-chamber, whereby
moisture is supplied above the level of the egg-holder.

8. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the water-tray ar-
ranged in the upper part of the incubating-chamber, and the
under water-tray.

9. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the ventilating-chim-
ney, and the thermostatic chamber, whereby the air escaping
from the incubating-chamber is caused to i ( through the
thermostatic chamber.

10. The combination, seaaae as before set forth, of
the incubating-chamber, two egg-holders, the thermostatic
chamber arranged between the said two egg-holders, and the
ventilating-chimney communicating with said thermostatic
ae

. The combination, Gabseantially as before set forth, of.
ms fees. chamber, the egg-holder, and two indepen-
dent heaters having their ends which receive heat arranged
at the opposite ends of the incubating-chamber

12. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the water-tray, and
the drain-pipe, whereby surplus water is conducted from the
incubating-chamber. |

Patent No. 210,559, dated December 3d, 1878.
Regulating mechanism for incubators, etc.

1. The combination, substantially as before set forth, of
two thermostatic bars by means of a connecting lever, which
has its fulcrum carried by one of said bars and its arm con-
nected with the other of said bars.

2. The combination, substantially as before set forth, of a
thermostatic bar arranged horizontally, with a counterpoise- —
weight.

3. The combination, substantially as before set forth, of

APPENDIX. 95

the engine-shaft, detent-motor, and engine-detent, whereby
the detent-motor is wound up by the engine.

4. The combination, substantially as before set forth, of the
engine, engine-detent, detent-motor, and regulator-detent.

5. The combination, substantially as before set forth, of the
engine, liquid speed-controller, and engine-detent.

6. The combination, substantially as before set forth, ofa
thermostatic bar, regulator-detent, detent-motor, engine-de-
tent, and engine. 3

7. The combination, substantially as before set forth, of
the engine, liquid speed-controller, engine-detent, detent-
motor, and regulator-detent.

8. The combination, substantially as before set forth, of the
regulator-detent, §detent-motor, engine-detent, engine, and
valve,

9. The combination, substantially as before set forth, of a
thermostatic bar, regulator-detent, detent-motor, engine-
detent, engine, and valve.

1o. The combination, substantially as before set forth, of
the detent and the shifting weight.

11. The combination, substantially as before set forth, of
the thermostat and the shifting weight. |

Patent No. 215,070, dated May 6th, 1879.
Improvements in chicken brooders.

1. The combination, substantially as before set forth, of
the brooding-chamber, the brood-cover, and the perforated
floor for the brooding-chamber.

2. The combination, substantially as before set forth, of
the brooding-chamber, the brood-cover, the perforated floor
for the brooding-chamber, and the hot-air chamber beneath
the said floor.

3. The combination, substantially as before set forth, of the
brooding-chamber, the brood-cover, the perforated floor of
the brooding-chamber, and the run communicating with the
said brood-chamber. 3

4. The combination, substantially as before set forth, of

96 APPENDIX.

the brooding-chamber, the brood-cover, the perforated floor
of the brooding-chamber, the hot-air chamber, and the fur-
nace, 3

Patent No. 217,148, dated July Ist, 1879.
Improvements in incubators.

1. The combination, substantially as before set forth, of
the incubating-chamber, the egg-hoider, the air-supply pipe,
and the heat-flue arranged within the air-supply pipe.

2. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder, and the heat-flue con-
structed to ascend to the upper part of the incubating-cham-
ber and to spread therein laterally in the vicinity of the exit-
tube, whereby the heat is more thoroughly distributed.

3. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder, the heat-flue ascending
in the incubating-chamber, and the water-tray applied to
said heat-flue.

4. The combination, substantially as before set forth, of
the incubating-chamber, the egg-holder, the heat-flue, the
water-tray applied to said heat-flue, and the waste-heat chim-
ney passed through said water-tray.

5. The combination, substantially as before set forth, of the
incubating chamber, the egg-holder, the water-tray within
the incubating chamber, the basin at the exterior of the cham-
ber, and the water-fount.

Patent No. 224,224, dated February 3d, 1880.
Improvements in incubators. .

1. The combination, substantially as before set forth, of the
egg-holder of an incubator with supporting-rollers connected
with the egg-holder by pivots, and with each other by con-
necting devices which cause them to revolve in the same —
direction.

2. The combination, substantially as before set forth, of the
egg-holder of the incubator, the egg-supporting rollers, and

APPENDIX. 97

the elastic bands which connect said rollers together and
cause them to revolve in the same direction with equal sur-
face speed.

Patent No. 281,397, dated July 17th, 1883.
Improvements in thermostats for incubators.

. I. The combination, substantially as before set forth, of the
straight expansile strip of the thermostat, the lever and
weight arranged to act upon one end thereof, and the adjust-
ing lever and screw at the opposite end thereof.

2. The combination, substantially as before set forth, of the
expansile strip of the thermostat and the frame thereof with

a weight by which the said strip is subjected to a strong ten-

sile strain, |

3. The combination, substantially as before set forth, of the
thermostat, the detent moved thereby, the revolving shaft
carrying the detent-arms, the paddle-arms also carried by
said shaft, the trough through which said paddle-arms move,
and the engine-frame holding the said detent-shaft, detent-
arms, paddle-arms, and trough, in their proper relative posi-
tions. |

4. The combination, substantially as before set forth, of the
walls of the incubator, the expansile strip of the thermostat
enclosed therein, the weight operating upon one end of said
strip to subject it to a tensile strain, and the adjusting screw
which operates upon the other end of said strip and extends
through the adjacent wall of the incubator.

Patent No. 281,398, dated July 17th, 1883.
Improvements in incubators.

1. The combination, substantially as before set forth, of the
incubating-chamber, with two lamps, both arranged at the
same end of said chamber and separated laterally for the pur-
pose described.

2. The combination, substantiaily as before set forth, of
the incubating-chamber, the heat-flue, the ventilating-chim-

98 APPENDIX.

ney, and the vent-pipe for the heat-flue arranged to deliver
into the ventilating-chimney.

3. The combination, substantially as before set forth, of the
egg-holder, the series of rollers thereof, and the turning device ~
arranged within the walls of the egg-holder which enclose
said rollers. :

4. The combination, substantially as before set forth, of the
incubating-chamber, the egg-holder thereof, the heat-flue ar-
ranged in the upper part of the incubating-chamber above the
egg-holder, and the heat distributor arnanegee below the heat-
flue between it and the egg-holder.

5. The combination, substantially as before set forth, of the
egg-holders arranged back to back with a space between
them, and the thermostat arranged between said egg-holders.

PRIGE-LIST QF INCUBATORS, Ec.

Incubator complete; capacity,
160 Eggs, - : - - $75.00

Registering Thermometer,extra, 8.00

Primary Brooder, complete, 2x4
feet, - - : : - - 15.00

Secondary Brooder, with two
brood chambers, 4 feet broad,
ready for floor of Nursery, - 15.00

TERMS.—Cash (without discount) on de-
livery in New York.

THE THERMOSTATIC INCUBATOR,

A Hand-book of Artificial henge
Paper covers, 36 cts.; cloth, 56 cts.

By mail on receipt of post-office order or postal stamps (2c. each).

ooo

E. S. RENWICK,
19 Park Place, New. York, WV. ¥.

a. age
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RARY OF CONGRESS

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