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MODEL OF 1903 


',' UNI v--k; ■■ r >' 

REVISED MAY 25, 1908 

c • 

• - • • %■ 

• •• ♦ « • 

• » • t » 

• * 



List of plates to accompany instructions for mounting, using, and caring for 

5-inch barbette carriage, model of 1903, 





Left side and rear view 

Right side and plan view 

Cradle details 
















Wak Depabtment, 
Office of the Chief of Ordnance, 

Washington, July 5, 1912. 

This Manual is published for the information and government of the Eegular 
Army and Organized Militia of the United States. 
By order of the Secretary of War : -^ 

William Crozier, 
Brigadier Oenerdl, Chief of Ordnance. 


> • > • « • • 
• • %• • • • 

■ n • > o « 

• •••• • • «• 9 t • 



(Four plates.) 


(The parts printed in italics should be specially noted.) 

PniNCiPAL Parts. — ^The carriage is of the pedestal mount type 
and its principal parts are: Pedestal, pivot yoke cradle, gunners^ 
platforms, traversing and elevating mechanism, shield and shield 
supports, open and telescopic sights, firing pistol and electrical 

Pedestal. — ^The pedestal is made of cast steel. The general form 
is that of the frustum of a cone united at its top to a cylindrical sec- 
tion and at its bottom to a base, in the flange of which are drilled 
holes for the 16 foundation bolts and 4 leveling screws. Four man- 
holes covered with plates are provided for cleaning the interior ; the 
joints of the covers are made water-tight by means of Garlock's 
gasket packing. 

The exterior of the cylindrical part is finished and forms a seat for 
the traversing wormwheel; beneath this seat on the front of the 
pedestal is a boss to which the friction band is secured. 

An annular boss is cast in the bottom of the pedestal. This boss 
is bushed with bronze and forms a bearing for the lower end of the 
pivot yoke. The upper cylindrical part of the pedestal is also 
bushed with bronze. These two bearings serve to keep the pivot yoke 
in a vertical position. 

The weight of the revolving parts is supported by a plain roller 
thrust bearing inserted between a shoulder near the lower end of the 
pivot yoke and the annular boss on the pedestal base. 

Pivot Yoke. — ^The pivot yoke of cast steel has a cored conical stem 

from which rise two vertical cheeks. In the latter are trunnion beds 

for the cradle which are fitted with interchangeable dovetailed cap 

squares bolted to the cheeks. The beds are bronze lined. Finishel 

recesses are formed in the outer faces of the cheeks into which the 

shield supports are fitted. These supports are also bolted to the 



cheeks oJ tkfe piVot'yak^.'' 'Annular projections are formed on the 
pivot yoke to prevent the entry of water in the bearings of the pivot 
yoke in the pedestal, and the ends of the cored hole in the stem are 
closed with plugs. On the underside of the cheeks are four bosses, 
to which the traversing gear case is bolted; the platform brackets 
are attached by bolts to their rear faces. Two oil holes are provided 
in the pivot yoke for oiling its upper bearing in the pedestal, and an 
oil pipe leading from a third hole to the thrust bearing near the lower 
€nd of the pivot yoke enables that bearing to be slushed with oil. 

Cradle. — The cradle of cast steel is bored out and, bushed with 
bronze to receive the gun. Oil grooves formed in the bushings and 
connected with the six oil holes in the cradle insure proper lubrica- 
tion of the bearing surfaces. Near the front end are trunnions for 
supporting the cradle and gun in the pivot yoke and on which the 
cradle and gun rotate when the latter is elevated or depressed. The 
holes in the trunnions are closed with screw plugs. In front of the 
recoil cylinder is a stop which limits the elevation to 16 degrees by 
striking the pivot yoke. 

On the top of the cradle is a ring by which the gun and cradle can 
be removed from or assembled to the pivot yoke. Bosses are also 
provided to which the sight brackets, shoulder guards, and elevating 
rack are attached. Underneath the rear portion and forming part 
of the cradle are the recoil cylinder and two spring cylinders, and in 
each of the latter is a spring rod, the rear end of which is attached 
to a yoke secured to the recoil band. The head of each spring rod 
rests on a pile of four springs, two carried in a stirrup telescoping 
in the other two which rest in the spring cylinder. Each two springs 
of the same diameter have separators between them.^ 

The length of the spring rods should be adjusted so as to return 
the gun into battery at the maximum angle of elevation without 
shock, but in no case should the head of the rod protrude out of the 
front end of the case, which is open. The recoil cylinder holds 1.5 
gallons of oil. The recoil cylinder has a forged-steel liner in two 
pieces, the front head being screwed and soldered to the cylindrical 
portion. Three throttling grooves are cut in the cylindrical portion. 

A counter-recoil buffer made of Tobin bronze passes through the 
front end of the recoil cylinder, and is held in place by its tapered 
shoulder being drawn up to a seat in the liner and casting by a nut 
which is screwed on the protruding threaded end of the buffer. The 
rear end of the cylinder is closed with a steel head, in which are 
filling and drain holes closed with screw plugs and the stuffing box 
with its gland and follower. The stufling box should be packed 
with five rings of 0.75-inch square Garlock's waterproof hvdraulic 

1 Some carriages have two springs of rectangular cross section In each spring cylinder 
with separators between, instead of inner and outer springs of circular cross section. 


packing. The piston is forged solid with piston rod, which is at- 
tached by a nut and check nut to the recoil band. The spring yoke 
rests on the recoil band, and is secured between the rear nut and 
band. In the piston is a bronze liner, and in the piston rod is an 
axial hole for the counter-recoil buffer. 

. The gun is not provided with trunnions, but has feathers on its top 
and bottom which fit in keyways cut in the cradle liner and control 
the ijiotion of the gun during recoil. A recoil band is shrunk on 
and keyed to the gun to which the recoil piston and spring yoke are 

KE(X)ni AND Counter-Recoil System. — ^The action of the gun is 
as follows : When fired the gun recoils to the rear abput 13 inches in 
the cradle, carrying with it the recoil piston and spring rods, thereby 
conipressing the counter-recoil springs. A small portion of the 
energy of recoil is taken up in compressing the springs, but the 
greater portion by the resistance which the liquid offers to being 
forced through the orifices formed by the throttling grooves. The 
width of the grooves is uniform, but their depths are proportioned 
so that the areas of the orifices, varying with the position of the 
piston during recoil, will be such as to give, with the aid of counter- 
recoil springs, a constant resistance throughout the length of recoil. 
The pressure in the cylinder is therefore a uniformly decreasing one. 
The counter-recoil buffer is tapered so that the escape of the oil 
during counter recoil through the varying diam^ral clearances 
between the buffer and walls of its hole will offer such resistance as 
will control the motion of the gun during its return and finally 
bring it to rest when the recoil piston reaches the front end of the 

Gunners' Platforms. — On each side of the gun is a platform 
bracket, the front end of which is bolted to the pivot yoke and to the 
rear end of which is attached a platform on which the gunner stands 
when laying the piece. 

Elevating Mechanism. — An elevating bracket, bolted to the left 
platform bracket, contains the elevating gear. By means of the ele- 
vating handwheel, its shaft, a pair of bevel gears, the elevating 
worm shaft and worm, the elevating wormwheel, and elevating 
pinion shaft motion is communicated to the cradle by means of the 
pinion and elevating rack. The elevating wormwheel is assembled 
as a rim on a cast-iron disk between two other disks which bear on 
its sides ; the three disks are assembled on the elevating pinion shaft 
in such manner that the pressure between the wheel and the disks 
may be varied by means of the nut on the outer end of the shaft. 
This nut should only be tightened sufficiently to insure enough fric- 
tion between the disks and wormwheel to enable the gun to be 
elevated and depressed and yet enable slipping to occur before any 


injurious strain is brought on the elevating wormwheel and worm. 
Three hundred pounds applied at the muzzle should slip the friction. 
(Cir. la, W. D., 1910.) 

Tlie rear edge of the elevating rack is graduated in yards and 
degrees on a German silver strip and an elevation pointer is attached 
to the elevating bracket. 

On the left side of the gun a shoulder itBSt is bolted to the elevating 
bracket so as to cover the bevel gears. • 

On the right side of the gun the shoulder rest is attached directly 
to the platform bracket, as there is no elevating mechanism on that 

Traversing Mechanism. — ^The traversing mechanism consists of 
the traversing wormwheel, traversing worm shaft and worm, two 
pairs of bevel gears, two traversing shafts and traversing hand- 
wheels. The traversing wormwheel is seated with a diametrical 
clearance of 0.01 indi on the exterior of the cylindrical top of the 
pedestal, a^d is retained in position by a shoulder on the pedestal 
and a steel ring secured by 12 screws to the top of the pedestal. 
Two oil holes are provided in this ring and through the top of the 
pedestal for oiling the bearing of the traversing wormwheel. The 
traversing wormwheel is protected from dirt and damage by the 
traversing gear case, made in two parts to permit ass^nbUng, and 
bolted to the four bosses on the pivot yoke. In the rear part of the 
case are the bearings and seat for the traversing worm shaft and 
worm. Beneath the teetii on the wormwheel is a seat for the friction 
band, made in halves and united by and attached to the boss on the 
front of the pedestal by a stud bolt, thereby preventing rotation of 
the band with the pivot yoke. 

The other ends of the halves of the band are joined by a bolt 
having a helical spring between th^n and the nuts. These nuts 
should be tightened to produce only sufficient friction between the 
band and wormwheel to enable the gun to be traversed without slip- 
ping and yet permit slipping in case imdue strain is brought on the 
teeth of the wormwheel. The spring serves to regulate and keep 
uniform during rotation the pressure of the band on the wormwheel. 
The traversing worm shaft is assembled with its worm in the travers- 
ing gear case in rear of the pedestal, its ends are supported in bear- 
ings attached to the platform brackets, and carry bevel gears into 
which the gears on the front ends of the traversing shafts mesh. 
Two ball thrust bearings incased in collars pinned to the traversing' 
worm shaft bear on either side of the traversing worm box and 
transmit the lateral thrust to the worm casing. The traversing 
shaft on the left side is supported by two bearings attached to the 
platform on elevating brackets, and the one on the right side by 
two bearings attached to the platform bracket and shoulder rest. 
On the rear end of each shaft is a handwheel. 


Shoulder Gtiards. — ^A shoulder guard is attached to the cradle 
and spring cylinder head on each side of the gun to protect the gun- 
ners from injury during the recoil and counter recoil of the gun. 

Sights. — ^A sight bracket is bolted to bosses on each side of the 
cradle. The rear end of this bracket contains the sight shank, ele- 
vating pinion, and worm wheel, worm shaft and sworm, range drum, 
counterbalance spring, washer, and handwheel. The yoke is at- 
tached tothe.front.end of the br^cjtet in such manner as to permit 
rotation about its vertical axis. The upper end of the sight shank 
is provided with a gib and a worm actuated by a knurled head on 
the right end of its shaft. The sight cradle which carries the open 
and telescopic sights is supported near its rear end by the sight 
shank on which it is gibbed. There is a rack on the cradle by which 
the latter can be moved in azimuth by the worm on the shank. The 
front end of the sight cradle is assembled to a fulcrum, whi<^ is sap- 
ported by its trunnions in the yoke. The aght cradle can therefore 
be elevated or depressed by means of the elevating wheel on the 
sight bracket, and can be moved in azimuth by the azimuth screw 
in the sight shank. The rear face of the sight shank is graduated 
to six minutes, and the periphery of the drum in yards. The rear 
face of the sight-shank gib is graduated to 0.05 of a degree and has 
a movement of 5 degrees, the central position being at the 3-degree 
mark and the nimibers beginning with 1 degree on the left. Elec^ 
trie lamps are provided for illuminating the graduated scales and 
cross wires. The open sights consist of a tube with a peephole at 
the rear and a ring carrying two intersecting blades at the front. 

The telescopes provided with this carriage have a 3-inch objective 
and are firmly clamped in the cradle. This carriage' is provided with 
both open and telescopic sights on each side of the gun, and the 
traversing and elevating mechanisms are arranged so that the gun- 
ner on the left side can lay the gun in both elevation and azimuth 
and the one on the right can lay it in azimuth only. 

Shield and Supports. — ^The shield is cylindrical in shape, the axis 
of which is inclined 40 degrees with the horizon ; it is 4^ inches thick 
and is pierced with a port for the gun and with two sighting holes. 
The shield is attached to the sides of the pivot yoke by two shield 

To reduce the power required to elevate or depress the gun to a 
minimum, the cradle trunnions are so located that the center of 
gravity of the gun (with the projectile and charge in place), cradle, 
and all parts attached to them lie on the axis to the trunnions; for 
the same reason the center of gravity of all parts moving in azimuth 
lie approximately on the vertical axis of rotation of the pivot yoke. 

Electrical Equipment. — Dry batteries in two boxes held in 
brackets secured to the platform brackets supply electric power for 
firing the piece and for lighting the lamps of the sights. 
10027—17 ^2 


The box on the left side contains four groups of five No. 4 O. K. 
cells in series. 

Three of these groups are connected, through individual rheostats 
contained in a cover secured to the battery box, with the three lamps 
on the left sight. 

The battery box on the right side contains three groups of five cells 
each, which in a similar manner are connected to the lamps on the 
right sight 

The fourth group of cells in the left battery box furnishes the 
current for firing the electric primer. 

One terminal is grounded by being connected to the platform 
bracket ; the other terminal is connected to a firing pistol secured to 
the elevating bracket. Another cable connects the firing pistol with 
the primer in the btHbech of the gun. 

The firing pistol contains a buzzer, which indicates by its sound 
when the firing circuit is closed. The connection is made through 
the buzzer by pressing on a push button. This completes a connec- 
tion through the coils of an electric magnet and the firing circuit. 
The resistance of the coils is so great that the current is insufficient 
to fire the primer, but when the trigger is pulledithe electric magnet 
coils are cut out and the current is then sufficient for firing. 

To Assemble the Carriage. — The following description refers 
particularly to the order in which the parts should be assembled. 

In assembling the parts see that all match figures on pieces corre- 
spond with each other. All numbers on the bolts should correspond 
with the number alongside of the hole in which they fit. 

AH the machined parts, including the joints, keys, bolts, bolt holes, 
and working parts, should be thoroughly cleaned (with fine emery 
cloth if necessary) and oiled before being assembled. 

On the arrival of a carriage at a fortification, the emplacement 
will have been prepared for the carriage by the setting of a bed of 
concrete with the foundation bolts in place. The pedestal with the 
leveling thrust plates in position is then set on the concrete bed with 
the stamped side to the front, and with the use of the thrust plates 
and leveling screws is leveled accurately to a sensitive spirit tevel 
placed across the finished top of the pedestal, leveling it in all direc- 
tions. After the pedestal is properly leveled, the foundation bolts 
are tightened and it is fixed in place by a grouting of neat Portland 
cement and the leveling screws backed off. The ball-thrust bearing 
is then placed on its bearing in the pedestal. The traversing worm 
wheel, with the friction band on it, is dropped over the upper part of 
the pedestal so that the hinge stud passes through its hole in the 
band.^^ The steel cover ring is secured by its screws to the top of the 
pedestal, care being taken that the oil holes in the ring match the 
holes in the top of the pedestal. 


The pivot yoke is then prepared for entering the pedestal by being 
properly cleaned and all burs removed. The bearing parts should 
be well lubricated and the yoke then lowered into position in the 
pedestal. After the yoke is in place the traversing gear case is assem- 
bled to the pivot yoke over the traversing worm wheel, with the worm 
box to the rear, and is then bolted to the pivot yoke. 

The right and left platform brackets should now be bolted to the 
pivot yoke and the elevating bracket, with the elevating mechanism 
and shoulder rest assembled to it, bolted to the left platform bracket. 

If not already assembled, the right shoulder rest should now be 
bolted to the right platform bracket. The traversing worm shaft, 
with its thi:ust collars, bearings, and bevel gears, is now assembled 
to the worm box in the traversing gear case and the bearings bolted 
to their seats on the platform brackets. 

The right and left traversing shafts, with their gears, bearings, 
and handwheels, are now assembled. 

Before placing the cradle on the gun carefully examine the gun 
and cradle bearings, removing with emery cloth all rust that may 
have accumulated or any burs that may have formed on these sur- 
faces. Lubricate well the bearing surfaces on the gun and cradle. 
Before placing the cradle on- the< gun^ unless.^ it Jias been . recently 
examined, the cylinder should be cleaned and the packing examined, 
following the method as far as practicable prescribed hereafter under 
the " Care of the carriage." The cradle is put on the gun from the 

The position of the piston rod is determined by unscrewing the 
rear nut on the rod and pushing the piston in its cylinder as far as 
it will go; the gun is then brought to a position where -the distance 
from the centers of the cradle trunnions to the front edge of the 
recoil band will be 55.25 inches. The nuts on the rod should then be 
tightened with the fork wrench fumidied for that purpose. The 
gun, with the cradle, can now be raised, and the trunnions of the 
cradle placed in the trunnion beds of tiie pivot yoke, after which the 
cap squares are played in their proper position and the elevating 
racjk bplted in place. The piston rod and springs should be assem- 
bled to the cradle before the latter is placed on the pivot yoke. 

The shield, with the shield supports attached, is now bolted to the 
pivot yoke. The shoulder guards are bolted to the cradle and spring 
cylinder heads. The sight brackets are bolted to the cradle. The 
battery-box brackets are bolted to the platform brackets. The bat- 
tery boxes (with batteries) are put in the battery-box brajckets and 
the cables properly connected. 

Important Points. — After the carriage has been completely assem- 
bled and the gun mounted the following points should be noted : 

1. See that the recoil cylinder is full of oil. 

2. See that the stuffing box is tight. 


3. See that all bearing surfaces are cleaned and well oiled. 

4. See that the cap squares are properly bolted down. 

5. Place projectile and charge in the bore of the gun and see that 
the gun and cradle with all appurtenances balance on the trunnions 
by adjusting the nuts on the piston and spring rods. 

6. Try carefully the elevating and traversing mechanisms. 

7. At all times handle the sights with care. 

8. JSee that the spring rod heads do not project forward out of the 
spring cases. 

9. Adjust carefully the friction band so the gun can be traversed, 
but so slipping will occur when the gun is being traversed rapidly 
and the handwheel suddenly stopped. 

10. Adjust carefully the elevating pinion shaft nut so the gun can 
be elevated or depressed, but so slipping will occur when the gun is 
being elevated rapidly and the handwheel suddenly stopped. 

Care of the Carriage; General, iNSTRucnoNS.^-Carriages should 
be traversed from time to time throughout their entire allowed 
movement. It is especially required that all parts of the carriage be 
kept from rust at all times. 

If this be allowed to accumulate, its removal from all bearing 
parts, and especially the piston rod, requires particular attention in 
order that clearances shall not be unduly increased. The use of sand- 
paper for this purpose is forbidden, and emery cloth No. 1^ being 
coarse enough for any ordinary rusting, should be used, the rust 
being softened, if necessary, by kerosene. 

If any leakage occurs from the hydraulic recoil system^ it should 
be immediately remedied, calling, if necessary, upon the district 
armament officer for the services of skilled labor. 

The repacking of stuffing boxes may be done, when necessary, by 
trained enlisted men under the supervision of an officer, but will 
preferably be done by skilled labor. 

Before removing a cylinder head containing a stuffing box or 
drawing a piston rod through a stuffing box the pressure of the 
packing on the rod should be released by imscrewing the follower 
several times. 

The copper gaskets between cylinders and their heads should be 
in good condition, and consequently should be replaced whenever 
necessary in order to prevent leakage. 

Recoil cylinders should be emptied at least every three months 
and thoroughly cleaned every six months. 

Instructions for Cleaning Eecjoil Cylinders. — For this cleaning 
a plumber's hand force pump is issued by the Ordnance Department 
to each artillery post. In cleaning, the following order of operations 
may be followed: 

{a) Elevate the gun about 10° and remove oil in the recoil cylinder 
through the drain hole. 


(6) Place the gun at 5° depression; accurately measure the dis- 
tance from the front face of the piston-rod lug on the band to the 
rear end of the recoil cylinder, for use in correctly assembling the 
gun in its balanced position. Knot a stout cable tightly around the 
breech of the gun immediately in rear of the band, passing the end 
along the top of the gun and through the eyebolt on top of the cradle, 
and lash it to one of the shield supports, leaving as little slack in the 
cable as possible. 

Slowly unscrew the rear nut on each spring rod until the front 
nut bears against the spring cylinder head, then remove the rear 
nuts. Remove the rear. nut on the recoil piston rod and the spring 
yoke. Place the gun at 5° elevation, release the end of the cable by 
a small amount, and by pushing on the muzzle move the gun rear- 
ward ; repeat these operations until the distance from the front face 
of the piston-rod lug to the rear end of the piston rod is just suffi- 
cient the permit the front nut to be removed (about 18"). Unscrew 
the follower about three turns to relieve the pressure on the packing 
and unscrew the cylinder head. Move the piston rod rearward 
through its hole in the recoil lug until the piston and rear cylinder 
head are against the lug. 

(c) Thoroughly clean the cylinder with kerosene oil forced into its 
rear end with a hand pump, then wipe the interior dry with clean 
cotton waste. The piston rod, piston, and rear cylinder head should 
then be cleaned. The counter-recoil buffer will not be removed. 

(d) The piston rod and cylinder head should be moved forward 
into place and the front nut assembled on the piston rod. 

Screw the rear cylinder head into its seat, taking care that it is 
firmly seated with gasket properly placed. Force the piston rod 
forward until the piston is against the front end of the cylinder 
and tighten the follower. Release the elevating friction clamp, and 
by means of a jack under the breech depress the piece uiitil by push- 
ing on the breech the gun moves slowly and gently into the firing 
position. Refill the cylinder with hydroline oil. Adjust the front 
piston-rod nut so the distance from the front face of the piston-rod 
lug to the rear end of the cylinder will be the same as before dis- 
mounting. The spring yoke and rear nuts should be replaced on 
the three rods, and the nuts on the spring rods tightened until the 
front nuts, which have not been moved, bear firmly against the yoke. 

Removing Packing from Stuffing Boxes (using new extractor, 
to be furnished by the Ordnance Department). — Close the extrac- 
tor around the piston rod and insert the locking pin. Turn the 
extractor to the left, with pressure on the packing, until the needles 
are firmly engaged in the packing. Draw the packing out, turn- 
ing slowly to the left. In the case of a box with interior thread, 
and if the ring is tight, it should be unscrewed and not stripped out 
l)y the thread, because unless unscrewed it would catch upon and be 



injured by the thread. Extractor bars are proviifed to be used for 
starting the packing from its seat and by insertiii^ the toes of the 
bars in the rack teeth and prying over the ^ge'of the box, being 
careful not to injure the thread. 

To Pack or Kepack a Stuffing Box. — ^To pa9k a stuffing box, 
after drawing the oil from the cylinders, remov^^'the follower and 
the gland and all the packing in the box. Exami^ the old packing 
and discard all unfit for use. If any of the old^packing is used, it 
should be put in after the new. , - • 

To repack, put on the piston rod one ring of 0.75>inch " Garlock's '^ 
waterproof hydraulic packing and force it well to^the bottom of the 
stuffing box by a wooden stick and mallet. Titot each layer of 
packing in a similar manner, being careful to break the joints, until 
five rings of new packing have been inserted or an equal amount of 
new and old when any of the latter is used. Place the halves of the 
gland on the follower, enter them together in the box, and screw up 
the follower, being careful to note that the halves of the gland do 
not bind on the screw threads. 

No more force than that of one man should he used to tighten the 

When the box is properly filled and the follower tightened there 
should not be more than 1 inch of space between the flange of the 
follower and the cylinder head. The follower should be tightened 
from time to time. If the follower be screwed into the stuffing box 
too tightly, an unnecessary amount of friction will be produced on 
the rod. When the follower is screwed in until the flange strikes 
the box another ring of packing should be inserted. It is expected 
that a slight amoimt of oil will soak through and drip from the boxes 
of carriages when not in use. This oil should be caught and not per- 
mitted to render the carriages unsightly. Also when tightening the 
followers a slight amount of oil will be squeezed out of the saturated 

Filling Recoil Cylinders. — Remove the filling plug in the rear 
cylinder head, fill the cylinder with oil, using for this purpose th^ 
filling funnel furnished with the carriage. Pour clean neutral oil 
of specific gravity about 0.85 (such as the hydroline now issued to 
the service). Allow any air that may be present to escape, then 
pour in more oil, until the cylinder is filled to the level of the filling 
hole. About 1.5 gallons are required. 

Service Condition (Lubrication, etc.). — ^When the carriage is to 
be kept in readiness for service and is in daily or frequent use, all 
bearing parts must be kept thoroughly cleaned and lubricated. 
Especial attention should be given to the lubricating of trunnion 
beds, bearing surfaces, shaft bearings, sliding surfaces, and the 
elevating and traversing mechanisms, including the teeth of all gears. 


The above and cJl parts where oil holes are provided should he 
lubricated at frequent intervals whether the carriage is maneuvered 
or not. When carriages are in use for daily drills a thorough lubri- 
cation twice each week should be sufficient for all but the most severely 
used parts. 

Condition " In Ordinary " (not ready for immediate service) . — 
If the carriage is to remain unused for a time all unpainted surfaces 
should be covered with a thin coat of light slushing oil. It can be 
applied as in painting, using sash tools No. 6, except in cold weather 
it should be applied by stippling, i. e., light tapping, with the brush 
held perpendicular to the surface to be covered. 

Should it rain within thirty hours after its application, all surfaces 
should be carefully examined and recoated if necessary. In all cases 
it should be applied in a thin coat^ as this is all that is needed to give 
good protection. 

This oil is easily removed by the use of burlap or waste dipped in 
kerosene oil. In order to save oil, a thick coating of slushing oil 
should be well removed by a scraper before applying the kerosene. 
Before applying the slushing oil the surf aces should be iho^'oughly 
cleaned, so as to be entirely free of rust, water, kerosene, lubricating 
oil, etc., as the first three would cause rusting underneath, and in the 
latter case it would run off when heated. 

Experience has shown that recoil cylinders should not be emptied, 
as in that case the interior walls soon become dry and rusty. 

Oil Holes. — Oil holes, where provided, must be cleaned out fre- 
quently to keep them free from sand and grit, and will habitually be 
kept closed by the screw plugs provided, except when in the act of 

Before oiHng at any oil hole ^ wipe off carefuG/y ami dirt or grit 
near the operdng that might be carried down into the bearing by the 

Full instructions covering the care and preservation of the car- 
riage, together with a table of allowances of cleaning and preserving 
materials, will be found in Form 1869. 

List of Articles Packed in the Abmament Chest for 5-inch R. F. Gun, 

Model of 1900. 

(Articles marked * are carried loose in the chest.) 

1 bar screw-driyer for obturator nut and pinion pivot, etc. 

1 bar screw-driver for gear segment screws, loading tray pivot, tripping 
stud screws, lock bolt seat screws, etc. 

1 bar screw-driver for block stop screw, circuit-breaker screw, obturator- 
nut clamping screw, etc. 

1 pin punch. 

1 gunner's punch. 

2 bronze drifts. 
1 gunner's drill. 

*1 gunner's pouch. 


*1 pair gunner's sleeves. 
*1 gunner's lanyard. 

1 cleaning reamer for primer seat. 

8 cleaning brushes for primer seat. 

1 metal scraper (f(>r removing paint). 

1 quire emery cloth, No. 00. 
*3 wagon sponges. 
♦2 pounds copper wire, No. 12. 
*2 pounds copper wire, No. 16. 
♦10 pounds cotton waste. 
♦4 balls twine, assorted. 

1 file, flat, head smooth. 

4 files, half round, smooth. 

1 file, rolind, second cut. 

4 files, three-cornered. 
3 files, pillar. No. 6. 

3 files, round, smooth. 

1 copper hammer. 

1 boiler maker's hammer. 

1 hand mallet. 

1 long-handled mallet. 

1 pair cutting pliers, 7-inch. 

1 monkey wrench, 124nch. 

1 monkey wrench, 15-inch. 

List of Abticles Packed in the Armament Chest fob 5-inch Barbettb 

Cabbiage, Model of 1903. 
1 filling funnel. 
1 oil can, ^-pint. 

1 oiler, locomotive (carried looi^ in chest). 

2 conamercial screw-drivers. 

1 double wrench for 0.375-inch and 0.5-inch nuts. 
1 double wrench for 0.625-inch and 0.75-inch nuts. 
1 double wrench for 1-inch and 1.25-inch nuts. 
1 double wrench for 1.5-inch and 2-inch nuts. 
1 single wrench for piston rod and follower. 
1 single wrench for cylinder head. 

List of Implements Furnished fob 5-inch R. F. Gun, Model of 1900. 

1 rammer and staff. 

1 sponge .and staff, bore. 

1 breech coyer. 

1 combined tompion and muzzle cover. 

1 sponge cover, bore. 

1 slush brush with handles to connect with special sponge staff. 

1 steel scraper and socket to fit special sponge staff. 

1 special sponge staff for slush brush with steel scraper. 

Matbbial fob 5-inch R. F. Gun, Model of 1900, and Barbette Oabktage, 

Model of 1903. 


5 rings Garlock waterproof packing, 0.75 inch square and 3 inches inside 

diameter, for piston rod. 
1 set of gaskets for carriage. 


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Weights 6f Pbingipal Pabts of 5-Inch Babbette Cabbiage, Model of 1903. 

No. to 


Name of part. 

Pedestal with covers , bushings, and bolts 

PiTot yoke with c{^>Hsctfiftfes, bolts, and plugs 

Cradle with cylinder liners 

Piston rod , head, and two nuts 

Spring yoke 

Roller thrust bearing 

Elevating rack 

Friction band, bolt, and springs 

Elevating bracket with shaft, gears, shoulder rest, etc., assembled 

Traversing wormwheel 

Gunners' platform, rirfit 

Gunners' platform, left 

Spring rods, sleeves and nuts 

Columns counter-recoil springs (rectangular wire) 

Elevating handwheel 

Traversing hand wheels 

Pairs traversing bevel gears 

Traversing shafts and four bearings 

Traversing worm shaft, two thrust collars and two bearings 

Traversing gear case 

Shoulder guards 

Shoulder rest, right hand 

Cylinder head with gland and follower 

Counter-recoil buffer , with nut 

Elevation pointer 

Sight brackets, with sights complete 

Battery box brackets 

Battery box rheostats, batteries, etc 

Shield with support bolts 



























Wab Department, 

Office of the Chief of Obdnance, 

Washington, June 7, 1911, 

October 19, 1905. 
Revised May 25, 1908. 
Revised June 7, 1911. 

Form No. 1684. 

Ed. Aug. 25-17—500. 


Articles packed in armament chest for : Pai 

Carriage I 

Gun : 

Boxes, stuffing : 

Removing packing from, method 13-' 

Repacking, instructions * 

Carriage : 

Care of, general instructions 1 

Parts of 

To assemble, instructions 10-1 

Weights of parts, table 2 

Cradle, description 6- 

Chest, armament, articles packed in, list 15-3 

Counter-recoil buffers, description : 6, 

Condition " In Ordinary," instructions t 

Elevating raeclianism, description 7-^ 

Electrical equipment, description 9-1 

Firing pistol, description 1 

Gunner's platforms, location ' 

Implements furnished, list 1' 

Important points 11-]K 

Lamps, electric, where provided 1 

Material for gun and carriage, list 1< 

Oil slushing, when used H 

Oil holes, precautions against dirt, etc II 

Parts : 

Names of, location, etc 17-21 

Weights, table 21 

Pedestal : 

Description * 

Leveling, etc IG 

Pivot yoke, description 5-6 

Plates, list J 

Principal parts 3 

Recoil cylinders : . 

Cleaning, instructions ■'^^~"^? 

Filling,' method 1* 

Not to remain empty . — 1^ 

Recoil and counter-recoil system, action J 

Service condition, lubrication, etc., instructions -"^^ q 

Shields and supports, description _ ^ 

Shoulder guards, location and use 8-9 

Sights, description and location 1 ^ 

Spring rods, adjustment ^ 

Telescope, description ^ 

Traversing mechanism, description ^ 

Weights of parts, list ^ 








YC 64336 

Gaylord Bros. | 

Makers f 

Syraeu««, N. Y. 
PAT. JAN. 21 



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