1073 1073

• SERVICE HANDBOOK_

OF THE 6-INGH BARBETTE . CARRIAGE MODEL OF 1910

FOR 6-INCH GU- NO MODEL OF 1908 Mu

PREPARED IN THE OFFICE Of' THE CHIEF OF ORDNANCE

May, 1923

WASHINGTON GOVERNMENT PRINTING OFFICE 1922 1073 1073

SERVICE HANDBOOK OF THE 6-INCH BARBFYFFE CAR IAGH MODEL OF 1910 FOR 6-INCH GUNS MODEL OF 1908 Mil

PREPARED IN THE OFFICE OF THE CHIEF OF ORDNANCE

May, 1921

WASHINGTON GOVERNMENT PRINTING OFFICE 1922 WAR DEPARTMENT Document No. 1073 Office of The Adjutant General

NOTE.-This document supersedes Ordnance Pamphlet No. 1713. WAR DEPARTMENT, WASHINGTON, May 31,1921. The following publication, entitled "Service Handbook of the 6-inch Barbette Carriage, Model of 1910 for 6-inch Guns, Model of 1908 Mu," is published for the information and guidance of all concerned. • [062.1, A. G. O.] BY ORDER OF THE SECRETARY OF WAR: PEYTON C. MARCH, Major General, Chiqfof Staff: OFFICIAL: P. C. HARRIS, The Adjutant General. (3) TABLE OF CONTENTS.

Page. List of plates 6 General description 7 Emplacement 7 The carriage 7 Principal parts 7 Pedestal 7 Pivot yoke Cradle 8 Recoil and counterrecoil system 9. Gunner's platforms 10 Elevating mechanism 10 Range disk 10 Traversing mechanism 11 Sight 12 Shield and supports 12 Gas-ejector system 12 Electrical fittings, cables, and wiring 13 Lighting circuits 14 The firing circuits 15 Shot trucks 15 Shot barrows 16 Instructions for assembling the carriage 16 Care of the carriage 19 Generalinstructions 19 Oil holes 19 To pack a stuffing box 20 Instructions for cleaning recoil cylinders 20 Approximate weight of principal parts of carriage 21 List of articles packed in armament chest 22 List of parts 23 (5) LIST OF PLATES.

Plate No. Drawing No. I. Platform plate (for casemate emplacement) 7-16-1 II. Platform plate (barbette emplacement) 7-16-1A III. Right and left side elevations • 7-16-2 IV. Plan and rear elevation 7-16-3 V. Cradle 7-16-7 VI. Cradle details 7-16-8 VII. Gas-ejector, assembled views 7-16-22 VIII. Gas-ejector, piping and details 7-16-21 IX. Wiring diagram and list of electrical equipment 14-6-147 X. Arrangement of lighting and firing circuits 14-6-148 (1) SERVICE HANDBOOK OF THE 6-INCH BARBETTE CAR­ RIAGE, MODEL OF 1910, FOR 6-INCH GUN, MODEL OF 1908 IVill.

[The parts in italics are of particular importance or concern the safety of the carriage and should be specially noted.]

GENERAL DESCRIPTION.

EMPLACEMENT.-Emplacements for carriages 1 to 4, inclusive, are casemate emplacements; those for carriages 5 and 6 are barbette emplacements. In the casemate emplacement the carriage may be traversed through a field of fire of 127°, being limited to this angle by traversing stops bolted to the shield. However, as the sight hole in the shield is about 23 inches to the left of the axis of the gun, the target becomes obscured if the carriage is traversed through an angle of more than 1200 from its extreme right position. In the barbette emplacement the field of fire is limited by traversing stops bolted to the pedestal and a stop bracket which is bolted to the right front of the pivot yoke. After the carriage is set in the emplacement the traversing stops are located to suit the emplacement conditions. The 16 anchor bolts are set in the concrete as the emplacement is constructed, the depressions for the pedestal base and thrustplates being also provided. THE CAnmAGE.---The carriage is of the pedestal mount type, and mounts 6-inch guns, model of 1908 Mu. Carriages 1 to 4, inclusive, being mounted in casemate emplacements, are provided with a gas- ejector system and a shield that protects the carriage and personnel from shell or fragments entering the port in the casemate. Car­ riages 5 and 6 are not provided with a gas-ejector system, and have a hooded shield which, together with the concrete parapet in the barbette emplacement, protect the carriage and personnel. PRINCIPAL PARTS.-The carriage consists of the following principal parts, viz, pedestal, pivot yoke, cradle, gunner's platforms, traversing and elevating mechanism,shield and shield supports, telescopic sight, firing magneto, electrical attachments, and (in carriages 1 to 4, inclusive) gas-ejector air valve, piping, and attachments. PEDESTAL-The pedestal is made of cast steel No. 1. In general form it is cylindrical. Approximately the upper 6 inches is reduced in diameter, and to it is pinned the bronze upper sleeve, which forms (7) 8 the pintle for the pivot yoke. To the lower part of the cylinder is. pinned the bronze lower sleeve, over which the bottom of the pivot yoke fits with just sufficient clearance to permit of easy traversing.. The base of the,pedestal is formed by a flange, in which are drilled holes for the 16 foundation bolts and 4 leveling .screws. On the upper surface.of the base is a vertical annular flange, 38.5 inches in diameter, to the top surface of which is screwed the-brass azimuth circle. The outer surface of the flange is machined and forms the seat for the traversing worm wheel. A shoulder near the top of the pedestal provides the lower path for: the conical traversing rollers. Three drain holes are provided which drain the pocket formed by the annular flange and body of pedestal. PIVOT YOKE.—The pivot yoke, of cast steel No. 2, has a cored cylindrical stem from which rise two vertical cheeks. In the latter are trunnion beds for the cradle, N'vhich are fitted with cast-steel No. 2 dovetailed cap squares bolted to the cheeks. The beds are provided with bronze No.4liners fastened in place by bronze counter­ sunk screws. Finished seats are formed on the outer faces of the •cheeks, to which the shield supports are bolted. On the left front of the yoke,near the bottom, is a boss having a finished seat to which the traversing gear bracket is bolted. A seat for the sight bracket is provided on the left cheek just forward of the trunnion bed. A seat for the upper bearing .and disk-bracket is finished on the right cheek of the yoke in rear of the trunnion bed. A boss formed on the rear of the cylindrical portion Of the yoke, below the cheeks, pro­ vides a seat for the elevating gear bracket. The two platforms are attached by bolts to seats on the right and left of the yoke. The upper and lower sleeves, roller path, and roller bearings are oiled through oil tubes which are closed,by oil pings. A micrometer azimuth pointer is attached to the left side of the yoke by two tap bolts. Elongated bolt holes permit of lateral adjustment of the pointer. A flange ring is bolted to the top of the cylindrical portion of the yoke inside the cheeks. A cover plate is bolted to the flange ring, completely covering the opening through the cylindrical por­ tion of the yoke and providing conduits for the lighting circuits. In carriages 1 to 4,inclusive,the cover plate and flange ring differ materi­ ally in design from those on carriages 5 and 6, due to the gas-ejector system installed on carriages 1 to 4. CRADLE.—The cradle of cast steel No. 2 is bored out and bushed with two bronze No.3 liners to receive the gun. Oil grooves formed in the bushings and connected with oil holes in the cradle insure proper lubrication 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 cored holes in the trunnions are closed with cover plates which are fastened to the trunnions by special countersunk screws. In front of the recoil cylinder a stop on each side limits the elevation to 12° by striking stops on the pivot yoke. Stops on the forward end of the cradle similarly limit the depression to 3°. On the top of the cradle and forming a part of the 'cradle casting., is an eye by which the gun and cradle can be removed from or assem­ bled to the pivot yoke. Underneath the rear portion and forming part of • the cradle is the recoil cylinder. Two spring cases are attached by countersunk bolts to lugs on the rear of the cradle and in each is a forged steel No. 3 spring rod, the rear end of which is attached by forged steel No. 3 nuts to a yoke secured to the recoil band. The head of each spring rod rests on a pile of two-nested springs in three sections each. Each two springs of the same diame­ ter are held apart by a spring separator. The length of the spriilg 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 from the front end ,of the case which is open. The recoil cylinder holds 3 gallons of oil. It has a forged steel No. 3 liner in two pieces, the front head being screwed 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 screwed in the front liner head. The rear end of the cylinder is closed with a forged steel No. 2 head in which are filling and drain holes closed with screw plugs, and a stuffing box with its gland and follower. The stuffing box is packed with 5 rings bf 0.75-inch square waterproof hydraulic packing. The piston is made integral with the piston rod, which is attached by a special forged steel No.3 nut and check nut to the recoil band. The spring yoke rests on the piston rod and is secure between the rear nut'and band. On the piston is a bronze No.4 liner, and in the end Of the piston rod there is an axial hole,for the counter-recoil buffer. The gun is not provided with trunnions, but has a key or feather on its top which fits in a keyway cut in the ,top of the cradle liner and which prevents rotation of the gun in the cradle during recoil or counterrecoil. A recoil band is shrunk on and keyed to the gun to winch the recoil piston and spring yoke are attached. RECOIL AND COUNTERRECOIL SYSTEM.--The action of the gun is as follows: When fired the gun recoils to the rear about 15 inches in the cradle, carrying with it the recoil piston and spiling rods, thereby compressing the counterrecoil springs. A small portion of . the energy of recoil iS taken up in compressing the springs, but the : greater portion by the resistance the liquid offers to being forced through the orifices formed by the throttling grooves. The width of the grooves is uniform, but their depth is proportioned so that the 10 areas of the orifices, varying with the position of the piston during , recoil, will be such as to give, with the aid of the counterrecoil 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 diametral clearances between the buffer and the walls of the buffer hole in the piston rod will offer such re­ sistance 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 cylinder. GUNNERS' PLATFORMS.—On each side of the gun is a platform which is bolted to the pivot yoke and on which the gunner stands when laying the piece. ELEVATING MECHANISM.—An elevating bracket of cast steel No.2, bolted to the rear of the pivot yoke, provides bronze bushed beds for the trunnions of the elevating nut. Dove tailed cap squares are bolted to the trunnion beds. The gear case of cast iron in two pieces and lower bearing of cast steel are bolted to the right side of the bracket. The upper bearing is bolted to its seat on the right cheek of the pivot yoke.- By means of the elevating handwheel, its shaft, the handwheel shaft gears, the intermediate elevating gears, the elevating nut shaft, the intermediate elevating shaft, the elevating pinion, the elevating gear, the elevating nut, and the outer and inner elevating screws, motion is communicated to the cradle. The upper end of the inner elevating screw forms an eye which is hinged between two flanges on the cradle beneath the recoil cylinder by the elevating pin. 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, the cradle and all parts attached to them lie on the axis of the trunnions; for the same reason the center of gravity of all parts moving in azimuth lies approximately on the vertical axis of rotation of the pivot yoke. RANGE DISK.—The range disk, consisting of an inner disk and an outer disk of hard brass and a German silver range s6ale, is assem­ bled to the disk bracket. The bracket provides bearings for the gear' shaft and disk shaft, on which are assembled the steel intermediate pinion, bronze intermediate gear, and steel disk pinion. The seat for the disk shaft-is bronze bushed. A spiral spring takes up the back ! lash in the gears. At the top of the disk bracket is a seat for the pointer base, with elongated bolt holes to permit of lateral adjust­ ment. A tongue on the pointer slides in a grOove in the base, and lateral adjustment of the pointer is made by means of a correction screw seating in the pointer base, and meshing with teeth machined on the arc of the pointer. A clamping screw secures it in position. 11

A bronze gear segment bolted to the right side of the cradle below the maneuvering ring meshes with the intermediate pinion. Any motion of the gun in elevation or depression is communicated through the gear segment,intermediate pinion,intermediate gear, and disk pinion to the range disk. The disk is graduated in intervals of 20 yards. The inner circumference of the disk is graduated for subcaliber ranges and the outer circumference for service ranges. The range scale is graduated after piece is mounted in emplacement from data fur­­ nished by the Ordnance Department. TRAVERSING MECHANISM.—The pivot yoke rests and is traversed upon a circle of 36 forged steel No. 2 conical rollers held in proper relative position by a bronze roller cage. The upper roller path of forged steel fits into the shoulder of the pivot'yoke and is held in posi­ tion on the rollers by a flange on its outer circumference. The lower roller path is machined on a shoulder of the pedestal. The traversing mechanism consists of a cast-steel traversing-gear bracket with bronze cover plate and oil pan,a cast-iron handwheel bracket, a hand- wheel and shaft, the upper traversing gears, the intermediate shaft, the lower traversing gears, the worm shaft, the worm,and two ball- thrust bearings. The traversing-gear bracket is bolted to its seat on the pivot yoke. A bronze No.3 bearing for the worm shaft is screwed into its forward end, having a notched head permitting of its being latched in adjustment by the worm-bearing latch, which is secured in the proper notch by a split pin. The other end of the worm shaft is supported in a bronze bushed bearing. The worm is keyed to the worm shaft, and ball-thrust bearings on the worm shaft at each end of the worm take up the thrust in traversing. The traversing worm wheel is seated on the outside of the annular vertical flange on the base of the pedestal, with a diametrical clearance of 0.005 inch, and is retained in position by a shoulder on the pedestal and the brass azimuth circle secured by 16 countersunk screws to the top of the flange. Beneath the teeth on the worm wheel is a seat for the friction band, which is made in halves united and tIttached to,a boss on the rear of the pedestal by a stud bolt, thereby preventing rotation of- the band with the pivot yoke. The forward ends of the halves of the band are joined by a bolt having a helical spring interposed between a shoulder on the band and the bolt head. A special bronze nut is provided for adjusting the tenSion on the friction spring and is held in proper adjustment by means of a split pin. This nut should be tightened to produce only sufficient friction between the band and the worm wheel to enable the gun to be traversed without slipping and yet permit slipping in case undue strain is brought on the teeth of the worm wheel. -The spring serves to regulate and keep unifoim during rotation the pressure of the band on the worm wheel. 12

The handwheel bracket is bolted. to the top of the standard, forming the rear part of the traversing-gear bracket. The inter- Mediate shaft is incased in this standard. Bronze bushed bearings are provided in the standard and in the handwheel bracket for the intermediate and handwheel shafts. The handwheel bracket pro­ vides a slotted seat for the firing Magneto, and a drilled boss to which the shoulder rest is bolted. SIGHT.-A sight bracket is bolted to the left cheek of the pivot yoke. Carriages Nos. 1 to 4, inclusive, are equipped with 3-inch telescopic sight, model of 1910, a full description of which is con­ tainecl in Ordnance Office Pamphlet No. 1960. Carriages No. 5 and 6 are equipped with 3-inch telescopic sight, model of 1912, a •full description of which is contained in Ordnance Office Pamphlet No. 1959. SHIELD AND SUPPORTS.-The shield for carriages 1 to 4, inclusive, is cylindrical in shape, _the hxis being vertical. It is made of special cast steel 5.3 inches thick and is pierced with a port for the gun and sighting hole. The shield is attached to the cheeks of the pivot by two front and two rear shield supports. • The shield for carriages Nos.5 and 6 is of special cast steel, approxi­ mately semielliptical in shape, and is hooded, the top being an integral part of the shield. The elements of .the sides of the shield are vertical, and the hood has an upward slope to the rear. The front of the shield is 5.3 inches thick, tapering from the shoulders to a thickness of 2 inches at the rear. The hood tapers from 21­ inches at the front end to 1.75 inches at the rear. The shield is pierced with a port for the gun and sighting hole. It is attached to the cheeks of the pivot yoke by two front and two rear shield supports. GAS-EJECTOR SYSTEM.-A gas-ejector system is provided for car­ riages 1 to 4, inclusive. It consists of a compressed air tank, fur­ nished by the Engineer Department, an air valve on the breech of t the gun with air passagesleading into the breech recess, and the neces­ sary piping, flexible tubing, pipe and hose supports, shut-off valve, etc., to connect the tank and the air valve. Th.tank is furnished and installed by the Engineer Department. From this tank a brass air-supply pipe leads to the air swivel,which is screwed into the stirrup on the flange ring. The air swivel permits of traversing the carriage; this is accomplished by means of a packing box, consisting of the packing-box"nut, the gland,and hydraulic packing. An elbow on the air swivel comes up through a hole in left side of the cover plate, flush with its top. The piping is carried from there through a hole in the left cheek of the pivot yoke. Here a shut-off valve is provided for cutting off the compressed air. At this point another elbow.and connection carry the pipe to the rear of the left cheek of the yoke, just below the rear shield support, where it is held rigidly by a strap 13 bolted to the yoke. Here connection is made to flexible tubing, which is carried back to the flexible hose support attached to the spring yoke. The breech connecting pipe, secured to the breech, connects the rear end of the flexible hose,to an air valve. The air valve is attached to the breech of the gun near the top and commu­ nicates with an air passage to an annular groove in the breech bush­ ing. From four equidistant points in the circumference of this groove pairs of Finch drilled holes communicate with the breech recess, opening into the recess approximately halfway to its forward end. The principal parts of the air valve are the valve body, the valve body cap, the check valve, the valve spring, the trip plunger, the plunger spring, and the trip lever. The valve body is attached to the face of the breech by four screws. Just below the valve body the cam block is screwed to the block carrier, and on this is pivoted the cam. A cam stop is also driven in the cam block, and the cam ig held against this stop by a spiral spring. The check valve is held in its seat in the valve body by the valve spring. The valve stem passes through and extends .below the valve body. An annular groove around the stem provides an oil packing to insure air-tightness. Just above this groove there is a second groove into which the trip plunger drops upon raising the valve stem. The trip plunger lever is pivoted at its center on a lug on the front of the valve body. The lower end is attached to the end of the trip plunger. The trip plunger spring forces the plunger against the valve stem. The action of the valve is as follows: When the block is translated in opening the breech, the cam attached to the cam block on the block carrier Pushes'the valve stem upward, raising the valve from its seat, until the trip plunger drops into the annular groove on the stem. The valve is thus held open until released by pressing on the Upper end of the trip lever. Upon closing the breech the rear face of the cam strikes the valve stem and swings out on its pivot till it passes the stem, when the cam'springY causes'it to spying back against the cam stop. . • ELECTRICAL FITTINGS,' CABLES', AND 3-inch conduit installed by the Engineer Department carries the lighting leads through a horizontal passage in -the platform and a vertical passage in the concrete beneath the•pedestal to a clamp on the beveled inte­ rior surface of the pedestal near the ;top. The leads as furnished by the Engineer Department are for' the lighting circuit only and are lead covered. Twin conductor leaded and armored-cable is used for the firing circuit which is lead directly from the firing magneto on the hand-wheel bracket along the left side of the gun and'carriage to the breech. 14

LIGHTING CIROLTITS.-At the clamp which is bolted to the front of the inside of the pedestal, the leads of a twin conductor leaded and armored cable having sufficient slack to permit of traversing the carriage within its field of fire, is connected to the leads furnished by the Engineer Department and carried to an outlet at the front of the cover plate. A terminal tube which screws into a tapped hole in the front of the cover plate furnishes a water-tight connection through which the armored cable passes to a four-way junction box located on the front of the pivot yoke. From the lower outlet of the four-way junction box, one twin conductor armored cable leads to a 5-ampere switch located on the right of the pivot yoke near the front. From this switch the cable is carried to the front end of a lamp resistance box which is bolted in a horizontal position on the right side of the pivot yoke just below the cradle trunnion. From the rear end of the resistance box, two armored cables are lead. One cable leads to the range disk lamp fitting which is fastened to its bracket at the range disk on the right side of the carriage, the otlier cable is lead downward on the right side of the pivot yoke, pass.ing across the front of the yoke to a lamp junction box at the azimuth pointer on the left of the carriage. Two 8-candlepower lamps illu­ minate the range and azimuth pointers. From the right-hand opening in the four-way junction box, a twin conductor armored cable leads to the engineer's plug box which is furnished by the Engineer Department and is located on the right cheek of the pivot yoke and from which is plugged a 16-candlepower portable lamp, provided by the'Engineer Department for each car­ riage, having sufficient cable to reach to any part of the carriage. The cable furnished for the portable lamp is of the twin conductor slicked reinforced type, and is not leaded or armored. From the left-hand opening in the four-way junction box a twin conductor armored cable leads to.the lower end of a lamp resistance box which is bolted in a vertical position to its bracket on the left side of the pivot yoke and elevating gear bracket. From the top opening in this lamp resistance box a triple conductor leaded and armored cable is lead along the left side of the pivot yoke to a recep­ tacle plug box located near the seat for the left forward shield sup­ port. From this plug box the cable is carried to the sight where two 2-candlepower lamps furnish illumination for the deflection scale and cross wires of the sight. A receptacle plug is provided for insertion in the plug box, which permits breaking the circuit on this lead. The 5-ampere switch on the leads to the range disk and azimuth pointer lamps serves a similar purpose. All lamps are provided with reflectors so as to illuminate only the p'uts intended. All lamps are arranged in parallel. The 2-candlepower lamps and 3-cand1epower lamps are of the bayonet base type, operating at • 15

approximately 16 volts. A wound tube resistance unit mounted in the lamp resistance box is inserted in series with each lamp which provides the necessary drop in voltage from either 110 or 220 volts, so that the voltage at the lamp terminals is 16 volts. Each lamp with its resistance unit • is in 'parallel on the circuit in order that the failure of anylamp or its resistance unit will not affect any otherlamp. After the lamps are in operation for some time,the lamp resistance box will become heated but the box is so designed that a temperature injurious to the Unit will not develop. The openings provided for the cables in all plug, receptacle, junction, and resistance boxes and the five-ampere switch are furnished with watertight terminal tubes. THE FIRING CIRCUIT.-The firing circuit for these carriages obtains its current from a hand-Operated alternating current magneto, type GA as described in Ordnance Office Pamphlet No. 1814, mounted on the handwheel bracket by means of a dove-tailed key or feather on the magneto which fits into a slotted seat provided for it in the handwheel bracket. From the magneto, twin conductor leaded and armored cable is lead to the rear along the left side of the carriage to recoil firing contactor made in two sections, one of which is attached by brackets to the gun band, the other to the cradle, in a plane parallel to the movement of the gun in recoil. • The recoil firing contactor is constructed on the principle of a knife switch except that contact is made or broken by the movement of • the gun in recoiling from or returning to battery position. It is provided with a telescopic'cover to protect the interior parts from the elements. Contact is made when the gun is approximately 2-i inches from the ,counterrecoil stop. The function of the contactor is to break the firing circuit when the gun is sufficiently out of firing Position to render its accidental discharge dangerous to the mechan­ isms of the carriage. It also eliminates the necessity of a loop in the firing cable to ,provide for recoil of the gun. From the contactor the armored cable is lead to the breech of the gun. At the breech one lead is grounded directly to the gun and one is connected to the gun portion of the circuit breaker, which completes the circuit to the primer when the gun is in battery and the breechblock is rotated home and locked. A method of finishing ends of firing cable where divided for contact at the breech and also terminals in small boxes in the form of soldered eyelets will be found on drawings of electrical equipment, 14-5-85 and 14-6-97.­ SHOT TRUCKS.-The projectiles are wheeled to the breech of the gun on shot trucks. The frame of the truck is bat up mainly of steel angles, riveted. The shot supports are two steel angles running the length of the truck and curved upward at their ends to provide stops for the projectiles and attachment of the handle. The truck 16 ­ is supported by four wheels, two in the center, of large diameter, on either side of the truck, and one small wheel at each end, all of which are either rubber or rope tired. It is handled by one man at the handle. The projectiles are placed across the truck on the shot supports, which are of sufficient length to' accommodate six projec­ tiles. For carriages 1 to 4, inclusive, four trucks are provided for each carriage. For carriages 5 and 6 two trucks per carriage are provided. The trucks for carriages 5 and 6 differ materially from those used with carriages 1 to 4, inclusive, being several inches higher and having truck wheels of correspondingly larger diameter. Trucks for carriages 5 and 6 are also provided with a 0.25 thick reinforced plate riveted to the shot supports. SHOT BARROWS.—To facilitate the handling of projectiles, shot barrows are supplied. These barrows are provided with a tray on which the projectile is laid. It is then lifted by two men and its forward end inserted in the powder phamber of the gun. The pro­ jectile is then rammed home. The forward end of the. barrow is provided with a metal shield in the,form of a cylinder which fits loosely into the powder chamber of the gun and affords protection to the interior of the chamber while the projectile is being inserted. Two handles riveted to the tray and located so as to maintain equilibrium of the barrow while the projectile is being lifted furnish a means of raising the projectile to loading position.

INSTRUCTIONS FOR ASSEMBLING THE CARRIAGE. TO ASSEMBLE THE CARRIAGE. The following description refers particularly to the order in which the parts are asembled rather than to a complete enumeration of the details of each operation: In assembling the parts, see that all match figures on parts cor­ respond with each other. All numbers on the bolts should corre­ spond with the numbers beside the holes in which they fit. All 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 assembling. 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 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 level placed across the finished top di the pedestal, leveling it in all directions. After the pedestal is properly leveled, the foundation bolts are tightened, and it is fixed in place by grouting of neat Portland cement, the leveling screws backed off, and the air-supply pipes placed in position. 17 THE TRAVERSING WORM WHEEL, with the friction band on it, is dropped over the lower part of the pedestal so that the hinge stud passes through the hole in the band. The spring bolt nut and friction spring are then.assembled. The azimuth scale is secured by screws to its seat on the upper surface of the annular flange on the pedestal. The traversing rollers, 36 in number, are assembled in the roller cage on the lower roller path machined on the shoulder of the pedestal. THE PIVOT YOKE is then prepared for being placed over the pedestal by being properly cleaned and all burrs removed. The bear­ ing parts should be well lubricated and the yoke then lowered into Position on the pedestal. The upper roller path, being a force fit in the yoke, remains in place. THE GUNNER'S PLATFORMS are bolted in place and the azimuth pointer bolted to its seat on the left side of the yoke. THE ELEVATING GEAR BRACKET is bolted and keyed to its seat on the pivot yoke. The elevating nut and shaft, the inner and outer elevating screws, the elevating gears, and the elevating gear cover are then assembled to the elevating gear bracket. The elevating gear bracket caps are then bolted to the bracket. The lower bearing for the elevating intermediate shaft is then fastened to elevating gear by two bolts. The intermediate elevating shaft-nut with one bronze gear is then assembled to lower bracket, the gear meshing with the, gear on the elevating nut shaft. The upper bearing is then placed, on intermediate shaft and bolted to pivot yoke. The pinion is then assembled to the intermediate elevating shaft. The elevating hand- wheel shaft, gear and elevating handwheel are then located in. place with gears in mesh. The gear case and cover plate are then bolted in place. • THE TRAVERSING GEAR BRACKET is next bolted to the pivot yoke. The traversing mechanism is then assembled in the bracket. 'The air-supply pipe is then fixed in position with pipe support, flange ring and cover plate, air swivel, packing box nut, packing box gland, elbow union, two pieces of hydraulic packing, elbow union plug, lock nut, union plug, swivel, connecting pipe. The front liner head, with copper gasket, counterrecoil buffer, piston and rod, rear liner head, with copper gasket and five rings of 0.75-inch square waterproof hydraulic packing, one gland, the filling and emptying plugs, and adjusting nut are assembled on the recoil cylinder. The adjusting nut is screwed, on the piston rod to its approximate position. The piston rod is then pushed forward till the piston brings up against the front liner head. The two spring cylinders are now bolted to the cradle, and in then'i are assembled the recoil springs, consisting of six outer and six inner ­ springs and four spring separators. The two spring rods with spring G2201-21 2 18 rOd heads attached are then passed into the spring cylindersfrom the rear. The recoil springs are then placed in the cylinders and thespring cylinder heads screwed on the spring cylinders. Two spring com­ pressor nuts are then screwed into place on spring rods, passing through holes in the cylinder heads, until bringing up against shoul­ der on spring rod. When gun is finally balanced there should be approximately 1 inch clearance between spring cylinder head and shoulder on spring compressor nut; the assembled height of the spring is 48.5 inches. Before placing the cradle on the gun, carefully examine the gun and cradle bearings, removing with emery cloth all rust that may have accumulated, also any burrs that may have formed on these surfaces should be removed with a fine file or scraper. Lubricate• well the bearing surfaces on the gun and cradle. Unless it has been recently examined, the recoil cylinder should be cleaned and the packing examined. THE CRADLE is now placed on the gun, the piston rod passing through the hole in the recoil band provided for that purpose. The spring rod yoke is assembled to piston and spring rods; the key on the spring rod yoke passes into the recess in the recoil band. Three take-up nuts are then screwed up against the spring yoke, one on the piston rod and one on each spring rod. The gun is now in its approximate position in•the cradle. All oil holes should be cleaned and oil plugs put in place. The gear segment is now bolted to the cradle. THE SHIELD SUPPORTS and for the casemate mount the shield strut, as well as the two traversing stops, are bolted in place. The shield is then lowered over the pivot yoke till the bolt holes in the supports are opposite the corresponding bolt holes in the yoke. The supports are then bolted to the yoke. The shield strut is now removed to permit of placing the gun and cradle on the yoke, after which it is replaced. The gun and cradle are now placed on the yoke, the muzzle of the gun passing through the port in the shield, and the trunnion caps bolted in place. The, recoil cylinder is filled with hydroline oil, and a projectile and powder charge placed in the gun, in order to balance the gun on the cradle trunnions. This is done by setting up or backing of the nuts on the piston rod and spring rods. The inner elevating screw is now assembled to the lugs on the cradle by means of the elevating pin. The disk bracket is bQlted to its seat on the pivot yoke, and to it is assembled the range-disk mechanism. Approximately two turns tension should be given to the spiral spring. The gun is now placed at its maximum elevation, and the gear segment and.pinion meshed so that the marks on each correspond. 19

Assemble the sight bracket to its seat on the left cheek of the pivot yoke, and the sight to the bracket. The firing magneto and shoulder rest and bracket are assembled to the traversing handwheel bracket. The remainder of the gas-ejector system and the electrical con­ nections and fittings can now be assembled.

CARE OF THE CARRIAGE. GENERAL INSTRUCTIONS. Carriages should be traversed from time to time throughout their entire allowed movement. It is especially important that all parts of the carriage be kept free from rust at all times. If rust 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 sandpaper for this pur­ pose 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. The repacking of stuffing boxes may be done, when necessary, by trained enlisted men under the supervision of an officer. The copper gaskets between the recoil cylinder liner and its 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. Experience has indicated that oil should not be removed from the recoil cylinders when car­ :riages are to remain unused for a considerable period, as the walls of the cylinders soon become dry and then rust. OIL HOLES.-Oil holes, where provided, must be cleaned out fre­ quently to keep them free from sand and gtit, and will habitually be kept closed by the oil plugs provided, except when in the act of oiling. Before oiling any hole, wipe offcarefully any dirt or grit near the opening that might be carried down into the bearing by the oil. All parts where oil holes are provided should be lubricated at I frequent intervals whether the carriage be maneuvered or not, and it is essential for the proper preservation and working of the carriage that on every day on which it is maneuvered for any purpose all bearings should be well lubricated immediately before such maneu­ vering. , , When carriages are in use for daily drills, a thorough lubrication twice each week should be sufficient for all but the most severely used parts. 20 TO PACK A STUFFING BOX.—Draw the Oil from the cylinder, remove the gland and all the packing in the box. Examine the old packing and discard any unfit for use. If any of the old packing be used, it should be put in after the new. To repack, put on the piston rod one ring of 0.75-inch waterproof hydraulic packing and force it well to the bottom of the stuffing box by a wooden stick and mallet. Treat eaci layer.of packing in a similar manner, being careful to break 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. Screw the gland in the box and set up tight.. No more force than that of one man should be applied to tighten up the gland, using the wrench suppliedfor that purpose. The addition of a pipe to the end of the wrench will not be permitted. The gland should be tightened from time to time. If the gland be screwed into the stuffing box too tightly, an unnecessary amount of friction will be produced on the rod. When the gland is screwed in till the flange strikes 'the box, another ring of packing should be in­ serted. It is expected that a slight amount of oil will soak through and drip from the boxes of carriages when not in use. This should be caught and not iijermitted to render ale carriages unsightly. Also, when tightening the glands, a slight amount of oil will be squeezed out of the saturated packing. For further information regarding paints, oils, cleaning materials, and methods of using same, ,see Ordnance Department pamphlet, Form 1869. INSTRUCTIONS FOR CLEANING RECOIL CYLINDERS.—A plumber's hand force pump is issued by the Ordnance Department to each ar­ tillery postfor this purpose. The cleaning should be done by enlisted men, under the direction of an officer, in the following manner: Elevate the gun about 10° and remove the oil in the recoil cylinder through drain hole,removing drain, and filling plugs. Then depress gun about 5°. Knot a stout cable tightly around the breech of the gun immediately in rear of band, passing the end along the top of the gun and through the eyebolt on top of cradle and lash it to one of the shield supports, leaving as little slack in cable as possible. Slowly unscrew the rear nut on each spring rod until the spring com­ pressor nut comes in contact with spring cylinder,head, then'remove the rear spring rod nuts. Remove the rear nut from the recoil piston rod and the spring yoke,-ft'cid remove set screw from front piston-rod nut: Pla-ce'gun at 5° elevation, release the erid of the cable by a small amount, and by pushing on the muzzle move the gun rearward; repeat-this operation until the distance between front face of piston- • rod lug and the rear end.of the piston rod is sufficient to permit Of the removal of front piston-rod nut. 21'

Unscrew the gland about three turns to relieve pressure on'packing and move the piston to the rear until rear liner head comes in con­ tact with recoil lug. Thoroughly clean the cylinder with kerosene oil forced into its rear end with the hand pump, then wipe the interior dry with clean cotton waste. The piston rod, piston, and rear liner head should then be cleaned. The counterrecoil buffer will not be removed. The piston rod and rear liner head should then be moved forward into place, and the front nut assembled on the piston rod, screwing set screw into its seat on piston rod. . Screw the rear liner head into its seat, taking care that it is firmly seated. Force piston rod forward until the piston is against the front liner head, then tighten the gland. Place a jack under the breech and remove elevating pin. Depress gun about 10, assemble elevating pin, release jack, and by pushing on the breech the gun moves slowly and gently into the firing position, against the,front piston rod nut. Then assemble spring yoke, rear piston-rod nut, and two spring rod nuts. The nuts on spring rods should be tight­ ened until there is 1 inch space between shoulder on spring com­ pressor nut and spring cylinder head. Screw the emptying plug into place and fill cylinder with hydroline oil. Allow escape of air, refill, and screw filling plug into place.

Approximate weight of principal parts ofthe carriage. Pounds. Pivot yoke 5,520 Pedestal 4,810 Shield with front and rear braces(carriages 1 to 4) 15,855 Shield with front and rear braces (carriages 5 and 6) 12,100 Traversing gear 480 Elevating gear 538 Recoil cylinder and piston 625 - Cradle with spring cylinders and springs 4,600 Worm wheel 675 Azimuth circle 84 Range disk and bracket 95 Telescopic sight and bracket 75 Friction band 57 Right platform 175 Left platform 175 Total approximate weight of carriages 1 to 4 33,746 Total approximate weight of carriages 5 and 6 29,991 Total approximate weight of 6-inch pin,.Model 1948 Mir 12,500 Total approximate weight of cafriates i to 4 With gun 46,246 Total approximate weight of carriages 5 and 6 with gun 42,491 22

List ofarticles packed in the armament chestfor 6-inch gun;model of1908 .3111, and6-inch barbette carriage, model of1910. FOR GUN.

No. Drawing. Price.mark. Articles.

*1 Box for firing mechanism. 3 15-5-47.. U47Z Brushes, cleaning for primer seat in F.M.box). 1 15-5-47.. U47BC Cloth, emery, No.CIO, 1 quire. 1 15-5-47.. U47AC Drift, bronze, large. 1 15-5-47.. U47AB Drift, bronze, small. 1 15-5-47.. U47W Drill, gunner's. 3 15-5-47.. U47AW Files, pillar, No.6,6-inch. For use on bruised! 3 15-5-47.. U47AV Files, three-cornered, No.4.6-inch. breech blocks;, 3 1575-47.. U47AT Files, round,smooth,8-inch. no other files to t 3 15-5-47.. U47AU Files, half-round,smooth,8-inch. be used thereon. 1 15-5-47.. U47AR File, flat, dead smooth,8-inch. 1 15-5-47.. U47AS File,round, second cut,8-inch. *1 15-5-47.. U47AU. File, half-round,smooth,8-inch. 1 15-5-47.. U47BH File, three-cornered, 8-inch. • 1 15-5-48.. U48F Hammer,machinist's, ball-peen,2pounds,commercial. 1 15-5-47.. U47AG Hammer,copper. , *1 i5-5-196. U196D Lanyard, gunner's. 1 15-5-47.. U47AN . Mallet, hand. 1 15-5-47.. U47AP .. Mallet, long handle. 15-5-47.. T.T47AQ Pliers, cutting, 7-inch. *1 15-5-23$ Pouch, gunner's. 1 15-5-47.. U47T Punch, gunner's. 1 15-5-47.. U47AF.. Punch, pin. 1 15-5-47.. U47AA Reamer, cleaning, for primer seat(in F. M. box). 1 15-5-47.. U47AE Scraper, metal. *1 20-2-17 Sleeves, gunner's, 1 pair. *3 15-5-47.. U47AX Sponges, wagon. *4 15-5-47.. U47AY.... Twine, assorted balls. *10 15-5-47.. U47AZ Waste, cotton,,pounds. *2 15-5-47.. U47BA Wire, copper, No. 12, pounds. *2 15-5-47.. U47BB Wire, copper, No. 16, pounds. 1 15-5-45.. .U45G 'Wrench, monkey,12-inch. 1 15-5-45.. U4511 Wrench, monkey, 15-inch. 1 15-5-44.. U44Z Wrench, tit, for obturator. 1 15-5-45.. U45W... Screw driver, bar, for spindle key. Gear segment screws, etc.

FOR CARRIAGE.

1 15-5-46.. U46Q Funnel, filling. 1 15-5-46.. U46J Oiler, half-pint. *1 15-5-46.. U46LI Oiler, locomotive, one-quart. 1 15-5-45.. U45AN Screw driver, commercial, 3-inch blade. 15-5-45.. U45AF Screw driver, steel. . 1 .15-5-44.. U44SA... -Wrench, box,s0.5 nut. 1 15-5-43.. U43C Wrench, double,,0.375 and 0.5 nuts. 1 15-5-43-­ U43F Wrench,-double,0.625 and 0,75 nuts. 1 15-5-43.. U43G Wrench,.double 0.875 and 1 inch nuts. 1 15-5-43.. U43K Wrench, double, 2 and 1.5 nuts. 1 15-5-43.. U43AB Wrench, single, pistonL•rod nuts and gland. 1 15-5-43.. U43V Wrench,single, 1.75 nuts. 1 15-5-43.. U43BB Wrench, single, 1.375 nut. 1 15-5-43.. U43S Wrench, single, 1.25 nut. 1 15-5-55.. U55M Wrench,spanner, recoil cylinder liner. 1 15-5-44.. U44KA Wrench,spanner, traversing worm bearing. 1 File card (commercial).

*Indicates articles carried loose in chest. 23

Name of parts of the 6-inch barbette carriage, Model of1910, their piece marks and draw­ ings on which the parts are ordered.

The parts are grouped and listed alphabetically under the following headings: Pedestal and yoke; cradle and recoiling parts; shields; traversing mechanism; ele­ vating mechanism; range disk; azimuth pointer; gas-ejector parts; electrical equip­ ment; shot trucks; shot barrows. When referring to a part, always mention its piece mark where given on the list. Carriages 1, 2, 3, 4, mounted in casemate emplacements, are fitted with gas-ejector system. Carriages 5 and 6 are mounted in barbette emplacements and are not fitted with the gas-ejector system. PEDESTAL AND YOKE.

Piece Di- Draw- Name of part. Remarks. mark. No. Class. vision. ing.

13G1 1 7 16 13 Azimuth scale 9L 12 7 16 9 Bolts, tap Carriage 1 to 4. 4B 4 7 16 4 do Leveling screw. 5E 4 7 16 5 do Special. 15R 6 7 16 15 do Carriage 5 and 6. 15B 4 7 16 15 do Do. 5C1 2 7 16 5 Caps 15S 1 7 16 15 Cover plate Do. 1ST 1 7 16 15 Flange ring Do. 8 7 16 13 Handy oilers Commercial. A3A1 1 15 OK 3 Name plate, No Q3J 19 7 16 5 Oil plugs, 0.5 7 16 5 Oil tubes Forced. 4G3 1 7 16 4 'Pedestal 8 7 16 4 Pins, 0.5 by 1.5 Driven. 6 7 16 4 Pins,0.75 by. 1 75 Do. 5B3 1 7 16 5 Pivot yoke...... 9K 2 7 16 9 Platforms Carriage 1 to 4. 37A 1 7 16 37 Platform,right Carriage 5 and 6. 37B 1 7 16 37 Platform,left Do. 5A 1 7 16 5 • Roller path 2 15 OK 3 Screws,0.25 by 0.5 20 7 16 5 Screws, countersunk, 0.5 by 1.25. 1311 16 7 . 16 13 Screws, countersunk 4E1 1 7 16 4 Sleeve, lower 4D1 1 7 16 4 Sleeve, upper 411 1 7 16 4 Stud, special...... 4A 4 7 16 4 Thrust plates 5D 2 7 16 5 Trunnion bed liners In halves.

CRADLE AND RECOILING PARTS.

7K 12 7 16 7 Bolts Special. 8A 1 7 16 8 Counterrecoil buffer 7A 2 7 16 7 Cover plates 7N2 1 7 16 7 .Cradle 7L 12 7 16 7 Crown nuts 3 7 16 8 Gaskets, cylinder 4 7 16 8 Gaskets,- plug

8K 1 7 16 8 Gland • 8W 1 7 16 8 Instruction plate 7E 1 7 16 7 Liner, front 7B1 1 7 16 7 Liner, rear 24

CRADLE AND RECOILING PARTS—Continued.

Piece Di­ Draw- mark. No. Class. vision. Name of part. Remarks.

8G3 1 7 16 • 8 Liner 8Z 4 7 16 8 Liners 8F1 1 7 16 8 Liner head, front 8L1 1 7 16 8 Liner head, rear 8M 2 7 16 8 Nuts 8B 1 7 16 8 Nut . 80 1 7 16 8 do Q3J 10 7 16 7 Oil plugs,05 5 7 16 8 Packing rings 811 1 7 16 8 Piston liner 8J 1. 7 16 8 Piston rod 8V 4 7 16 8 Plugs, filling and drain 2 extra. 28 7 16 7 Rivets, countersunk, 0.875 4 7 16 8 Rivets, countersunk,0.25 8X 2 7 16 8 Screws Riveted over. 7M 31 7 16 7 Screws, special 8E 1 7 16 8 Set screw 12 7 16 • 7 Split pins, 0.203 by 2 1 7 16 7 Split pin, 0.25 by 2.75 8Q 6 7 16 8 Springs, inner " 8P 6 7 16 8 Springs, outer 8172 2 7 16 ,8 Spring compressor nuts 7J -2 7 16 7 Spring cylinders Tubing. 8R1 2 7 16 8 Spring cylinder heads 8D2 2 7 16 8 Spring rods 8N 2 7 16 8 Spring rod heads 8T1 4 7 16 8 Spring separators 85 - 1 7 16 8 Spring yoke

TRAVERSING MECHANISM.

20 15 7K 26 Balls, 0.5 diameter 1126M 2 15 7K 26 Ball thrust bearings Two pieces. I126W 1 15 7K 26 Bolt 38B 6 7 16 38 Bolts, tap Carriages-5 and 6. • 38D 4 7 16 38 do Do. 11G- 3 7 16 11 do 11D 4 7 16 11 do 11N 4 7 16 11 do 11F 4 7 16 11 d 1126GA 8 15 7K 26 do 130 1 7 16 13 Bolt spring, with nut 11A 2 7 16 11 Bolts - 11B 1 7 16 11 Bushing 110 1 7 16 11 -- do - 1111 1 7 16 11 do .11L 1 7 16 11 do • 11P 1 7 16 11 do • 11K 1 7 16 11 Cover 11E 1 7 16 11 Cover plate 2 7 16 11 Crown nuts, 1 • 1126B 1 15 7K 26 Crown nut, 0.75 I126D 1 15 7K 26 do • 112611 1 15 7K 26 Crown nu,1 25 2 7 16 11 Dowel pins, 0.375 by 1 25

TRAVERSING MECHANISM—Continued.

Di- Piece Class. Draw- Name of part. • Remarks. mark. No. vision. ing.

1 7 16 11 Dowel pin, 0.187 13J 1 7 16 13 Friction band In halves. 1126X 1 15 7K 26 Gear, traversing, lower I126Z 1 15 7K 26 do H26AA 1 15 7K 26 Gear,traversing, upper H26AB 1 15 7K 26 do 1126GA 1 15 7K 26 Gear key, upper H26K 1 15 7K 26 Handwheel 11J1 1 7 16 11 Handwheel bracket 112611 1 15 7K 26 Handwheel shaft II26EA 2 15. 7K 26 Hose H26A 1 15 7K 26 Intermediate shaft Tray. details. 1326S 1 15 7K 26 Latch worm bearing H26FA 2 15 7K 26 Nut srips 11M 1 7 16 11 Oil pan 16 11 Q3J•4 }Oil plugs,0 5 { 157 7K 26 11 Q30 10 16 }Oil plugs, 0.375 { 77 16 13 2 7 16 11 Pins,0.25 by 1 2 7 16 11 Pins, 0.25 by 1.25 2 7 16 11 do 1 7 16 11 Pin,0.25 by 2 2 7 16 11 Pins, 0.25 by 0.875 2 7 16 11 Pins, 0.187 I126N 2 15 7K 26 Re,taining rings 401 1 - 7 16 4 Roller cage 4? 36 7 16 4 Rollers, traversing 1126DA 2 15 7K 26 Shoulder brackets 1126T 1 15 7K 26 Shoulder rest 1126? 1 15 7K 26 Sleeve 2 15 7K 26 Split pins,0.25 by 1.75 1 7 16 13 Split pin,0.203 3 15 7K 26 Split pins, 0.156 by 1 5 1 15 7K 26 Split pin, 0.203 by 2.25 13E 1 7 16 13 Spring,friction 13B •1 7 16 13 Spring nut 1126R 1 15 7K 26 Stem 380 2 7 16 38 Stops, traversing 38A 1 7 16 38 Stop, traversing horn 2 15 7K 26 Taper pins, 0.208' by 2.875.... 11Q .1 7 16 11 Traversing gear brAcket 6K .2- 7 16 6 Traversing stops Carriages 1 to 4. 1126G 1 15 7K 26 Traversing worm 13A2 .1 7 16 13 Traversing worm wheel 6 7 16 38 Washers, lock,0.875 4 7 16 38 Washers, lock, 1.25 H26Q 1 15 7K 26 Washer 13D 1 7 16 13 do 1126E 1 15 7K 26 Worm bearing 11260 1 15 7K 26 Worm shaft 1126? 1 15 7K 26 Worm key 26

ELEVATING MECHANISM.

Piece viDs ii o-n. Di rnagw­ mark. No. Class. Name of part. • Remarks.

9E 2 7 16. 9 Bolts.

+ 10L 4 7 16 10 Bolts, tap 90 2 7 16 9 do 9F1 1 7 16 9 Bolt, tap OV 3 7 16 9 Bolts, tap • 9W 3 7 16 9 do ON 8 7 16 9 • do • OR 4 7 16 9 do . 9P1 1 7 16 9 Bracket cap, left 9Q1 1 7 16 9 Bracket cap, right 9A 1 7 16 9 Bushing - 911 1 7 16 9 do 9J 1 7 16 9 do 9S 1 7 16 9 do 9X 2 7 16 9 Bushings In halves. 101(1 1 7 16 10 Cover 9U 1 7 16 9 Cover plate 10B 3 7 16 10 Crown nuts, 0.75.. 7D7D 1 7 16 7 Crown nut Special. 1 7 16 10 Dowel pin, 0.375 by 1.5 9M1 1 7 16 9 Elevating gear bracket lOW 1 7 16 10 Elevating handwheel shaft ' 10112 1 7 16 10 Elevating nut 10A 1 7 16 10 Elevating nut shaft 70 1 7 16 7 Elevating pin . 10R1 1 7 16 10 Elevating screw,inner 1011 1 7 16 10 -Elevating screw, outer 10M 1 7 .16 10 Elevating shaft 10T1 1 7 16 10 Gear,-ele\rating 10D1 1 7 16 10 do 10E1 1 7 16 10 do 10G1 1 7 16 10 do 9D 1 7 16 9 Gear case 10V 1 7 16 10 Handwheel - 100 2 7 16 10 Keys 9B 1 7 16 - 9 Lower bearing 7 16 9 • Q3j. 3 7 16 10 }pH plugs, 0.5 Q3C 2 7 16 9 Oil plugs,'0.375 105 1 7 16 10 - Pinion 1OF 1 7 .16 10 do 9Y 16 7 16 9 Pins Driven. '2 7 16 9 .Pins, 0.125 by 0.812 Do. 1 7 16 9 • Pin,0.125 by 1.187 Do. 1 7 16 ,9 Pin,0.125 by 0.937 Do. 2 7 16 9 Pins,0.125 by 0.75 Do. 2 7 16 9 Pins,0.125 by 1.062 Do. 9G 4 7 16 9 Plugs, drain, 0.625 10N 1 7­ 16 10 Sleeve • 7 7 16 10 Split pins;0.156 by 1 5 ' 3 7 16 9 Split pins; 0.125 by 1.25 10P 1 7 16 10 Stem 1 7 16 10 Taper pin, 0.162 by 2.375 1 7 16 10 Taper pin, 0.162 by 1.812 9T 1 7 16 9 , Upper bearing Elevating gear parts 10Q 1 7 16 10 Washer 27

SHIELDS.

Piece Di- Draw- Remarks. mark. No. Class. vision. ing. Name of part.

6E 36 7 16 6 Bolts, tap 6G 28 7 16 6 ' do Carriages 1 to 4. 6G1 28 7 16 6 do Carriages 5 and 6. 6B 8 7 16 6 - Bolts, special Carriages 1 to 4. 28A 1 7 16 28 Shield Carriages 5 and 6. 17A 1 7 16 17 do Carriages 1 to 4. 611 1 7 16 6 Shield strut Do. 6D1 2 7 16 6 Shield supports,front Do. 6P1 2 7 16 6 Shield supports rear Do. 36B 1 7 16 36 •Shield support,'front, right Carriages 5 and 6. 360 1 7 16 36 Shield support,front, left Do. 36A 2 7 16 36 Shield supports, rear Do.

RANGE DISK.

14P 3 7 16 14 Bolts tap..., 14M 3 7 16 14 do 14Y 2 7 16 14 do 14Q 1 7 16 14 Bushing 1415 1 7 16 14 Clamping screw 14T 1 7 16 14 Collar 14V 1 7 16 14 Correction screw 14W 1 7 16 14 Correction screw collar 14B 2 7 16 14 Crown nuts, 1 14P 1 7 16 14 Crown nut, 1.25 14N2 1 7 16 14 Disk bracket 1 7 .16 14 Disk hub 1 7 16 14 Disk,inner. 1 7 16 14 Disk, outer 14S1 1 7 16 14 Disk pinion 14A 1 7 16 14 Disk shaft 14L2 1 7 16 14 Gear segment 14E1 1 7 16 14 Gear shaft 141(3 1 s 7 16 14 Intermediate gear 14R 1 7 16 14 'Intermediate pinion 2 7 16 14 -Keys Q3C 3 7 16 14 Oil plugs, 0.375...... 2 7 16 14 Pins,0.25 by 0.625.- 14J 1 7 16 14 -Pin 1 7 16 14 do Soldered. • 2 7 16 14 •Pins, 0.25 by 0.625 14C1 1 7 16 14 'Pointer, elevating 14X 1 7 16 14 Pointer, base 14132 1 7 16 14 Range disk 1 7 16 14 Range scale 1 7 16 14 Screw,0.25 by 0.875 14BA 40 7 16 14 Screw, fillister head, 0.164 by 0.21. 14AA 32 7 16 14 Screws,0.312 by 0.21 1 7 A.6 - 14 Splitpin,• 0.093 3 7 16 14 Split pin, 0.203 14G1 1 7 16 14 Spring, spiral 2 7 16 14 Strips Index marks. 1 7 16 :14 Taper pin, 0.208 1 7 16 14 Taper pin,0.093 1 7 16 14 Taper pin, 0.135 14Z 1 7 16 14 Washer 28

AZIMUTH POINTER.

. Piece Draw- mark. No. Class. vision. ing. Name of part. Remarks.

39A 1 7 16 39 Body,indicator 39B 2 7 16 39 Bolts, tap 39F 1 7 16 39 Collar • 1 7 16 39 Crown nut 39M 1 7 16 39 Index 39G 1 7 16 39 Nut 39D 1 7 16 39 Pin, 0.093 1?y_ 1 inch . 3911 1 7 16 39 Screw, fillister head 390 1 7 16 39 Screw 39L 1 7 16 39 Sleeve 39E 1 7 16 39 Slide 1 7 16 39 Split pin 39K 1 7 16 39 Spring washer 2 7 16 39 Washers,lock Tempered. .

ELECTRICAL EQUIPMENT.

111080 1 14 4 108 A daptor E106U 8 14 4 106 Bars, terminal, connecting E21F 1 14 4 21 Base E24F1 1 14 4 24 do E22L 2 14 4 22 Bases E10511 14 4 105 Base E106B 2 14 4 106 Bases, resistance EllOD 4 14 4 110 Bayonet sockets Commercial. P88L 2 14 5 88 Blades T96PA 14 14 6 96 Bodies T9611 2 14 6 96 do T96BB 2 14 6 96 do E105CA 1 14 4 105 Body plug P88E 8 14 5 88 Bolts, special E107C 2 14 4 107 Bolts, tap E26B 2 14 4 26 ....do V130B 4 14 130 do V13011 2 14 130 do V130K 2 14 130 do V130D 7 14 130 do E200 2 14 4 20 do E2OF 2 14 4 20 do E105F 14 4 105 do T91R 9 14 6 91 do P68V 4 14 5 68 do T91CB 14 14 6 91 do E36B 1 14 4 36 Box cover E106N 2 14 4 106 Boxes,lamp resistance E105E 1 14 4 105' Box,receptacle E24Y2 1 14 4 24 Box, 5-ampere water-tight switch. V130A 1 14 130 Bracket, contact case firing.. Blade end. V130G 1 14 130 do Clip end. E105R 1 14 4 105 Bushing 1 14 6 147 1 14 6 147 1 14 6 147 1 14 6 147 1 14 6 147 Cable A 1 Azimuth lamp; 1 -14 6 147 range disk lamp. 14 6 147 1 14 6 147 For items bracketed,see tabulation on drawing 14-6-147. 29

ELECTRICAL EQUIPMENT—Continued.

Piece Di- 'Draw­ part. Remarks. mark. No. Class. vision. lug. Name of

1 14 6 147 Cable B 1 14 6 147 - Cable C 2 14 6 147 _Cables D T91Z 4 14 6 91 - Cable straps TOMB 12 14 6 91 do • V37G 1 14 0 37 do T91F 5 14 6 - 91 do E24P1 1 14 4 24 Cain E24R 1 14 4 24 Cam shaft E105LA 1 14 4 105 - Cap, plug E105M 1 14 4 ••105 Cap, receptacle. E1.05N 1 14 4 105 Chain - •• • • P68F 2 14 5 68 Clamps In halves. P8811 2 14 5 88 Clips • E105U. 3 14 4 105 Clips, terminal 1 14 4 107 Conductor,flexible, portable, plain. E2lIC. 2 14 4 21 Connector strips. E21M 2 14 4 - 21 • do E24J1 2 14 4 -24 Contact strips E22A13 1 14 4 22 Coupling E27W 1 14 4 27 • do RHO 2 14 4 26 Covers E1050 1 14 4 105 Cover E21D 1 14 4 21 ...... do E10611 2 14 4 106 Covers, resistance box E105G 1 14 4 105 Dowel pin • - P880 1 14 5 88 Firing contact case P88D 1 14 5 88 (co P88A 2 14 5 88 Firing contact case covers, E21C1 1 14 4 21- .. Gasket E26E 2 14 4 26 Gaskets E105T 1 14 4 105 Gasket, cap P8911 2 14 5 89 Gasket, case cover E105S 14 4 105 Gasket, cover E106W 2 14 4 106 Gskets,- cover E361) 1 14 4 36 - Gasket, cover E107E1 1 14 4 107 - Gasket, lamp-Socket holder E107F 1 14 4 107 -do- E105EA 1 14 4 105 Gasket, plug - E21Y1 2 14 4 21 Glands E105DA 1 14 4 105 Gland E2411 1 14 4 24 do THRA 14 14 6 96 Gland nuts T96QA 14 14 6 96 Gland rings T9613 2 14 6 96­ do' E21X 2 14 4 .21. do T96E13 2. 14 6 96 do P89A 1 14 5 89 Guard, front P890 1 14 5 89 Guard, rear E24S 14 4 24 Handle -.. • E109B 2 14 4 109 Holders,lam- E107D 1 14 4 107 Holder,.lamp E108E 1 14 4 108 Holder, lamp socket E109A 2 14 4 109 Housings, contact E24BA1 1 14 4 24 _ Indicatprplate -Soldered in place, E106M 2 14 4 106 . Insulations P8811 2 14 5. ..88 do 30

, ELECTRICAL EQUIPMENT—Continued.

Piece Di- Draw-

mark. • Class. vision. ing. Name of part. Remarks. r

E2111 -A 14 4 21 Insulation.- r E24G -A 14 4 24. ..,...do E105Q r-4 14 4 105 do E22BA CV 14 4 22 Insulations,- base E21A2 r-4 14 4 21 Junction box -­ E20A 14 4 20 - Lamp, portable - Furnished .- by En­ gineer Depart­

CV ment. .-- EllOC 14 4 110 Lamps, electric, 8-candle- Frosted.

power. CV EllOA 14 4 110 Lamps, electric, 2-candl& power. E20E r-, 14 4 20 Lamp hook E107B1 14 4 107 Lamp junction box . V1300 14 0 130 Lamp resistance-box bracket, • _ top; V130E 14 . 0 130 Lamp resistance-box bracket, . .bottom. - cAD 14 4 1.06 Nuts, 0.375 CAD 14 5. - 95 Nuts, 0.312(5/16) E21S C.:: 14 4 21 Nuts E22G CAD 14 _4 22 do E105AA 14 4 105 Nuts,_hexagonal E106Q 14 ­ 4 106 Nuts, round E106K '.<" 14 4 106 Nuts, clip and term -E109E CV 14 4 109 Nuts,. gland T96V CV 14 6 96 do •

T96EB CV 14 _6 96 do- , r -A 14 4 . 105 Packing

r-i 14 4 36 do

C ,

• 1 14 4 109 Packings

, r-1 t 14 6 96 ...... do Ter.'tubing TWIN A. CV 14 4 21 do Cl 14 6 96. do Ter-. tubing T96B.

CV 14 6 -96 do Ter. tubing TOOCB

r -A 14 4 24 Pin, 0.093 by 0-5 . . E1.09G 14 4 109 Pin. CN1 •

14 -4 1.07 - Pins, holder lamp socket C

, , 1 1.4 4 108 Pins, 0.078 by 0.238

V23B 14 0 23 Pipe plugs, 0.75

c,;, , E105LIA 14 4 105 Plates, Contact . E106T . 14 • 4 106. Plates, washer E2,OR r-, 14 4 20 Plug,box Furnished by En gineer Depart - merit.

EKE- * 1.4 4 21 Plumber's chain . r

-A 14 4 108 . Portable conductor g inches long:. r-4 14 4 20. Portable-- - conductor, plain Furnished by - En gineer Depart ment. . V130L1 . 14 0 130 Range lamp - junction- box bracket. E2GA r-4 r-4 14 .4 26 Receptacle box

• El2PA 14 4 12 Reflector. • - r T85K -A 14 - 6 . 85 do E40E-_ CV 14 4 4-0. Resistance tubes E4OG CV 14 4 40 d.6 ' E4OTI CV 14 4 40. do E4OK 14. 4 40 do . 31

ELECTRICAL EQUIPMENT—Continued.

Piece Di- Draw- Remarks. mark. No. Class. vision. ing. Name of part.

P88G 2 14 5 88 Retaining rings 1E105FA 14 4 105 Ring, gland E109D 2 14 4 109 Rings, gland E21B 2 14 4 21 Screws E21G 2 14 4 21 do E21AA 14 4 21 do E24B1 2 14 4 24 do E105D 6 14 4 105 do E261) 4 14 4 26 do E22M 4 14 4 22 do P88B1 8 14 5 88 Screws, fillister head, 0.25 P89B 8 14 5 89 Screws, round head, 0.25 by 0.312. E1060 16 14 4 106 Screws, base E24Z2 2 14. 4 24 do MO5K 3 14 4 105 do E24T 1 14 4 24 Screw, cam securing E105P 1 14 4 105 Screw, chain END 8 14 4 26 Screws, cover E106S 24 14 4 106 do E36C 6 14 4 36 do E24L2 4 14 4 24 Screws, contact strip E106G 16 14 4 106 Screws, clip and short termi­ nal. E105X 3 14 4 105 Screws, clip E22F 4 14 4 22 Screws, terminal E105KA 3 14 4 105 do E105Z 3 14 4 105 do E109C 4 14 4 109 Screws, housing lock E21P . 6 14 4 21 Screws, terminal, 0.75 long.. E21() 2 14 4 21 Screws, terminal,0.875 long.. T97W 14 6 97 Screw, terminal Furnished by Water­ town. E241\12 4 14 4 24 Screws, terminal E10611 4 14 4 106 Screws, terminal, long E9G1 2 14 4 9 Springs E106F 2 14 4 106 &lips, connecting (short) EINE 2 14 4 106 Strips, connecting (long) E105W 3 14 4 105 Strips, connector E106P 8 14 4 106 Studs T97R 4 14 6 97 Terminals T97S 2 14 6 97 do T971J ii 14 do T97Z 6 97 14 6 97 do T97T 2 14 do E105GA 6 97 1 14 4 105 Terminal contact E241I1 2 14 Terminal springs. E24K1 4 24 2 14 4 24 Terminal strips 2 14 4 24 Terminal stuffing tubes. To be in accord­ ance with require­ ments for each carriage. E21W 2 14 4 21 Terminal tubes P85A 2 14 5 85 Tubes, terminal, insulating P88K1 8 14 5 88 Washers if,21R 8 14 4 21 do E105BA 9 14 4 105 do E2211 4 14 4 22 do 32

ELECTRICAL EQUIPMENT-Continued.

Piece Di­ Draw­ mark. No. Class. vision. ing., Name of part. Remarks.

E106D 12 14 4 106 Washers, base E]05L 3 14 4 105 do E24Q, 2 14 4 24 Washers,cam E106L 28 14 4 106 Washers, clip and terminal 8 14 130 Washers, lock

SHOT TRUCKS, TYPE GA, AND SHOT TRUCKS, TYPE UM.

AD7X 6 15 9A 7 Bolts Carriages 1 to 6. AD7A 10 15 9A 7 do Do. FE1X 4 15 9EA 1 do Do. FE1R 2 15 9EA 1 Braces, right, lower Carriages 1 to 4. GE2G 2 15 9FA 2 do Carriages 5 and 6. FE1S 2 15 9EA 1 Braces, left lower Carriages.1 to 4. GE2H 2 15 9FA 2 do Carriages 5 and 6. FElL 2 15 9EA 1 Braces, upper Carriages 1 to 4. GE1D 2 15 9FA 1 do Carriages 5 and 6. AD7K 2 15 9A 7 Bushings Carriages 1 to 6. AD7V 2 15 9A 7 do Carriages 1 to 4. AD7BA 2 15 9A 7 do Carriages 5 and 6. AD7E 2 15 9A 7 Caster wheels Carriages 1 to 4. AD7D 2 15 9A 7 do Carriages 5 and 6. FE1F 2 15 9EA 1 Caster-wheel pins Carriages 1 to 4. GE2F 2 15 VA 2 do Carriages 5 and 6. 16 15 9A 7 Crown nuts, 0.5 2 15 9EA 1 Crown nuts, 0.75 Carriages 1 to 4. 2 15 9FA 2 Crown nuts, 1 Carriages 5 and 6. AD7L 2 15 9A 7 Detachable rims Carriages 1 to 4. AD7AA 2 15 9A 7 do Carriages 5 and 6. AD7C 2 15 9A 7 do Carriages 1 to 4. AD7EA 2 15 9A 7 do Carriages 5 and 6. FE1T 2 15 9EA 1 End braces, top. Carriages 1 to 4. GE1E 2 15 9FA 1 do Carriages 5 and 6. FE1U . 2 15 9EA 1 End braces, bottom Carriages 1 to 4. GE1H 2 15 9FA 1 do Carriages 5 and 6. M.(4- 1 15 9EA 1 Handle Carriages 1 to 6. AD7T 2 15 9A 7 Main wheels Carriages 1 to 4. AD7Z 2 15 9A 7 do Carriages 5 and 6. FE1C 1 15 9EA 1 Main-wheel axle Carriages 1 to 4. GE2A 1 15 9FA 2 do Carriages 5 and 6. FEU' 2 15 9EA 1 Main-axle brackets Carriages 1 to 4. GE2C 2 15 9FA 2 do Carriages 5 and 6. 1 15 OK 3 Name plate No 3 Carriages 1 to 6. Q3C 4 15 9A 7 Oil plugs Do. 4 15 9A 7 Pins Do. 2 15 9EA 1 Rivets(special), handle Do. 9EA 1 }Rivets, round head, 0.5 . Do. 4 { 15 9FA 1 28 15 9EA 1 Rivets, 0.375 Carriages 1 to 4. 44 15 9FA 1 do Carriages 5 and 6. 15 9FA 2 }Split pins, 0.093 by 0.5 Carriages 1 to 6. 2 { 15 9EA 1 16 15 9A 7 Split pins, 0.125 by 1.25 Do. { 15 9FA 2 }Split pins, 0.156 byl1 Do. 2 15 9EA 1 2 15 9EA 1 Split pins, 0.156 by 1.5 Carriages 1 to 4. 33

SHOT TRUCKS,TYPE GA, AND SHIDT TRUCKS, TYPE%BB---=Continued.

Piece Di- aw mark. No., Class. vision. ing. Name of part. *Remarks. , , 2 15 9FA 2 Split pins,0.203 by 2...... _.. 'Carriages 5 and 6. GE1A 1 15 9FA 1 Shot plate_....--...-...„. Do. . FE1G 1 15 9EA 1 Shotsupport, right.. _..._. Carriages 1 to 4. GE1B 1 15 9FA 1 do_ Carriages 5 and 6. FElli 1 15 9EA 1 Shot support, left__ _...... Oarriages 1 to '4. GE1C 1 15 9FA 1 do..._ .....„..-...-...... Carriages 5 and 6. FEDI 1 15 9EA ,1 Stop,right.-.— -.------Do. FEIN 1 15 9EA 1 Stop, left...-..--..- --...-- Do. 2 15 OK 3 Screws, -name plate...... 'Carriages 1 to 6. PE1J . 2 15 9EA 1 Standards,right 'Carriages 1 to 4. GE1F 2 15 9FA 1 do 'Carriages 5 and 6. PE1K 2 15, 9EA 1 Standards,left Carriages 1 to 4. GE1G 2 15 9FA 1 .....do.. . Carriages 5 and 6. 2 f 15 9EA 1 1 15 9FA 2' }raperf pins,0.279 by 3.125 'Carriages fto 6. AD7A1 2 15 9A 7Tires 'Carriages 1 to 4. AD7PA 2 15 9A 7 ...._doCarriages5 and 6. AD7W 2 15 9A 7 do...... Carriages 1 to 4. AD7CA 2 15 9A 7 do 'Carriages 5 and 6. 2 15 9EA 1 Washers Carriages 1, to 4. GE2B - 2 15 9FA 2 do Carriages 5 and 6.

SHOT BARROWS.

NC22C 3 15 9 22 Guard supports, top and side NC22D 1 15 9 22 Guard support, lower NC23A 2 15 9 23 Handle supports NO23E 4 15 9 23 handle blades NC22G 1 15 9 22 Joint strap NC22F 1 15 9 22 Lower guard support web 1 15 9 23 Nut NC22E 1 15 9 22 Reinforce ring 30 15 9. 22 Rivets, 0.25 16 15 22 Rivets, 0.187. Guard supports. 8 15 9 22 do Support web. 14 15 22 Rivets,0.25 16 15 9 23 Rivets, 0.187 12 15 9 23 Rivets, handle NC22B 1 15 9 22 Screw box guard 1 15 9 23 Split pin, 0.062 NC2317 4 15 9 23 Split handles In halves. NO23B 1 15 9 23 Stop NC23C 1 15 9 23 Stop bolt NO23D 1 15 9* 23 Stop-bolt washer. NC22A 1 15 9 22 Tray.

GAS EJECTOR SYSTEM CARRIAGES 1 TO 4 ONLY.

19G 1 7 16 19 20C Air swivel­ 1 7 16 20 Angle valve, 0.75 Commercial. 19B 4 7 16 19 19D Bolls tap 6 7 16 19 .....do 20N 2 7 16 20 do 20K 2 7 16 20 do 2OR 2 7 16 20 do 62201-21--3 . 34

GAS EJECTOR SYSTEM CARRIAGES 1 TO 4 ONLY—Continued.

Piece Class. Di- Draw- Name of part. Remarks. . mark. • No. vision. ing.

2011 4 7 16 20 Bolts, tap 20E 4 7 16 20 Bolts 21B 2 7 16 21 Bolts and nuts 18L 1 7 16 18 Cam 18M 1 7 16 18 Cam block 18A 1 )7 16 18 Cam screw 1851 1 7 16 18 Cam spring . 18V 1 7 16 18 Cam stop 18E 1 7 16 18 Check valv.e 21G 1 7 16 21 Coupling Furnished by Engi­ neer Department. 190 1 16 19 Cover plate 19A 1 7 16 19 Flange ring 20M 1 7 16 20 Flexible hose support(rear) 1 7 16 22 Flexible metallic tubing 20D 1 7 16 20 Flexible tubing clamp 20G 1 7 16 20 Flexible tubing support 18W 1 '7 16 18 Gasket 18X 1 7 16 18 do 19L 1 7 16 19 Lock nut 20F 4 7 16 20 Nuts 205 1 7 16 20 Pipe support 20Q 1 16 20 Pipe support clamp 18J 1 7 16 18 Plunger guide 19111 1 7 16 19 Packing 19F. 1 7 16 19 Packing-box gland 19E 1 7 16 19 Packing-box nut 19M 1 7 16 19 Pipe,swivel,connection,0.75 20B 1 7 16 20 Pipe,valve connection,0.75 20A 1 7 16 20 Pipe,breech connection,0.75 2101 1 7 16 21 Pipe air supply 21F 1 7 16 21 do Do. 2111 1 7 16 21 do Do. 21E 1 7 16 21 Pipe support 20L 1 7 , 16 20 do 21D 1 7 16 21 Pipe-support clamp 20J 1 7 16 20 do 21A 2 7 16 21 Pipe supports 18G 4 7 16 18 Screws, countersunk, 0.375 18N 3 7 16 18 Screws, flat fillister' 18Q 4 7 16 18 Screws, valve body 4 7 16 20 Split pins, 0.093 by 1 18D 1 7 16 18 Spring, plunger 18B 1 7 16 18 Spring, valve 18K 1 7 16 18 Trip plunger 18P 1 7 16 18 Trip-plunger pivot 1811 1 7 16 18 Trip-plunger pivot pin 180 1 7 16 18 Trip lever 18T 1 7 16 18 Trip-lever pivot 18U 1 7 16 18 Trip-lever pivot pin 19K 1 7 16 19 Union plug 19J 1 7 16 19 Union-plug elbow 20T 3 7 16 20 Union nuts 20P 3 7 16 20 Union sleeves 18F 1 7 16 18 Valve body 181-1 1 7 16 18 Valve-body cap 19N 1 7 16 19 Washer PLATE L

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•••••••••••••••••••.•••••••••••••••••••••••••• 62201-21. (To face page 34.) No. .._ PLATE III.

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62201--21. (To face. page 34.) No. n PLATE TV.

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62201-21. k To face page 34.) No. 4 PLATE V.

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67S 4rA.04,ze CIfEWS pIty.ve4 Rieer..5* le'A'ONZE 7'01 9400401CL 0,4A711.1. S A Are-RAA,-.0 THIRTY ONE - NOZ ANO CLASS 7 DIYISION e FOI? C(27"1",f 62201-21. (To face page 34.) No. 5 PLATE VI.

- 1 437(,1) Cal"P" /Of L1908411 .375- # /O. -----­ -125 OfPROT&/NS 6eaISIN 2. 2.5 ).1 71 sc4ve. Of0/WWITE ,SC/SJAS \4*- c\!.onfr OfCrINDER .0900­ Js76.8­ 2.5P/STON .2,5-368 /48576 COM/,TE/7 RECO& 81/1712? OA(' 7081/V BRAVE /6.3 - 8e'&?/N(ISST2 Th//??..0 /74 FINISI/E.0 NO/NAL nrC0/1 fli5 ZZS /15. P/STOIY 77f 1-.73-4-/. STEEL 111/e3S,- hVOLI/D8/6 2EXTRA , Fa, 2 PgRriliL !Yew .75 TAP DITP Jo ecifiN.U55TP. r/YR:DS: 41,4/NER NENO(FfoNr) L, IS CYORE ./25- PEEP 75- h_ParR//s!as.5712 rAaRbs. r2t COPPER C.ASIII-T.062 / 711/0/,' ,. .75 TAR,' .06 PG/LOAN/ZED /-181-1? OASATT: •113( Zfa....) COPPER' 6:40E7 .062(41 THICK. / :34 41 6/11FLAW WiliffROGV- Llfwic PAc.41,-/- 2:51 -51i7N6S042.3- &gay)7/25 FoR7 7e,0/I49TE9 OARR/A6f. , • ' .PiwitwirAwrozffi, Aar 7PER/N. MS.572. PLATS - IZf FLATS £75 L2S I TIM'S. COPPITGASICE Nrm% *N\111% 2.7S - i2479 • .062MTIIICH ja 25 - alimileataireattgi ,4 -1 1:4._ limserawromo • • t,) MIIIM=Es )tg .56: cri Assmow 2.025-4 od, \ 'c,15 IloRTIAZ we* HZSAlgEllit) 4 'a N1 812ERiN.u.s.sro. IVO6HEZ/At Mint 1 THR'05. /0/YRINuSsrDrAwk)s.rafto. ­ 1==1111W'' . PereghvNe061Y0.47(ANC/NG4FG4W /4:CA',41Zt­ TRamv/oNs• 'Ap •N.004SW \ L875 ::.)375 - rly:re/vo TO8,44/6 .373­ 7//' iir 5-16 ­ VAWA- 11Frediazzarz #4551M • ..in• Tiff* izL/N6 325 3.7.5­ SECT/ON zs_ pszN- riz,/,N /95 71/#006// LINER .1­08610STEEL NO.3 SI/OW/N6 7W017Z/NO fOliVED STEEL NO3 evivofres. 2.375 ,.7 23.75 L sz5­ ,st .92.5 /.3:RE-Cal - st--r 7/ER/N. s49. _ IF/IN oliicir/s1,7'.14'r j%1915/ Tr°117*. I _ „2/cw/NG ROD h' / t-ORGEO 7/WO/W:1 ..9rEez NO.30 Z/NER HEAD Z/NE/f 1'117g4/ ilef /D TOY Xt712 RAD Iiir9,0/(8//44),2 (82) ­ .625-1 ONE-f0/F6E0 STEEL aNr--PCWOED STEEL 0.3. oNf-11,517_41ZE ehr-/ar67,9- STEEL Av.? ORE-rafe,L­.0 STEEL NO 2. ‘:t) 5,PRIN6 Caill'RE-5544' itiLli r f/NUM /7NiShf, 545/6 17 1741/SH 1747SH. f/hi/S11. -TX/VI TWO -Frei:, TEST &TOPE43-517.18LiA6 liv CERDLE --.625 75. __.... _tril _____J----). I . 1:,...i./0-..35 . ------L 7377.777-7 -7-77-777,, , #4. woo Aro liree.ardetaanir 4.4.41 ,- /-NaT-Te,f6£13 STEEL #0.3 s. ',,%_ -7---t",k 4t. 4, atilirtir re.1. pe,f.//v: B75 tc:, 4 Ile .11 4 0 #04,4 tt s.sra rig/42s . /OS ------..T. 11. t a • I ------y-­ _ ---.,:-.\------4------y- 4., i --- Ni • ------­ ' --- \ nu ''''' .4 4 10 ITYRNI! ,5: 0 fta. Oie * AFASO,NA‘ , iNit.-MI AVIZIOragrAIMAM 1.4611yrogionly maw • vmkot 295 TO Thr/NN/ONS - - 4.95 27. 413.5ASSE4657.10­ NE/SAIT _ . - 58.875- 6.25 _ -5.625 ' /1,-­ ,5P/#7/Ve; SPIT'//Y' A'OD OOTIF 3/W1'a .274, o-fonviD sTLYI No.43 . .1) .3-zx_s7yy.-Jy.!oc______zy,o 20/T H4No. _544- -.57-/NEENLE-8;406::17,0/Aliff 1, 4NO. orcm viDER ,va 41­ TiN/SWED T//4N /0.26' fiPiAcriti SOLID 1/E/C71/7- NOT /v/0/71- 501/0 NE/v//ITNOT NOM- 71/A/V SEC7/ON Self/NO rehi­ ,ISSIA1.6yr.D 1/Z761/T/.5:9/6* UNDO?NOTLESSTHAN2.2/61115. A55E/V8L1:01/1161/17.57- 9/6ZINGENNDT 11,,,y,V.A9N/072185 sALLVIK* , L1 NOT LESS THAN -1902 /NS/DEDP7M ,ONE--farsai SiTEL NO 2. € /NS/DED/A/W. I-7?fe, ThTE, NOTLESS TI/AN-1,-1/ cc, 01/7S/z7E.014/r1 S0Z/z7, NOT4108t- TI/9N 6.908 Oeirsswf0/4/e SQL/Di NO/NONE 7**,04,4'2 IniLL AR9ILELOWNY ESVAPIE L1)IF AD i FINISHED RIEHILL AHD CLOA" ...... ___ --...... C:11/NeR/VET LE TTERS /NO FL/INGEs TO BE Potwar° REVISIONS RAISED AN) DOFFED BR/AI/7: 98.6 -eAcil .P.-i7ifi.5z-7-7z- c4fir7 sf Z1-71:iirFir A,itA if NOV..215 /-9.V. _ 4/w-4207,: ASIL Or ,,,%,..' en),,9L'i_I - - .25 iNSTNacTiON PL/VIE0 .0E7XiiS ------ii_Azy -- ­ ONE-BRONZE ------OC77.2,i / ------78;) - APRIL S,1.9/0 2,2fA. lirRaYIE .SCREWS RYETEO WM.

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LI5TOF TITLE /9.55.EMEILE17 WEWS /7//f 14.7Z ke"WO DETAILS, SIR SWIVEL. AND'DETAILS PZ,VP/6 AND 12ETA/LS PIPING ACIO DETAILS

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