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-peratures, common to marine work. The steam 'mechanism consists of four stout -pieces only, 'and it is the only inside valve gear that is large air chamber is placed directly over the TAE MarINE REVIEW | | 41 thrusts of the links from coming on the piston rods and wearing out the stuffing boxes, the cross head is provided with adjustable bronze shoes which bear on a heavy guide bar, taking up all the side thrust. To permit constant running, a continuous oiling system is provided consisting of stationary sight feed oil cups with separate pipes leading to all working parts. Drain cocks are located at all necessary points, affording quick and easy drainage; suitable provision is made for holding up the vacuum cylinder covers, pistons and followers when packing the pump. All parts requiring to be re- moved or handled are provided with forcing screws and - lifting bolts. The boilers are fed by Cameron vertical boiler feed pumps of the marine piston type. The main feed pumps, size 12 x 8 x 16, are installed in the engine room. There are also two auxiliary feed pumps, one in each boiler room, of the same type but of the size 10 x 6 x 13. The sanitary pumps, size 6 x 8 x 8, are of the Cameron vertical marine type, having entire bronze water cylinders, and are used for delivering sea water into.a 100-gallon pressure tank, in which a constant water pressure of 20 lb. is maintained. The fresh water pump, size 5 x 4 x 7, is of the Cameron regular horizontal piston pattern, and supplies the drink- ing fountain coolers and toilet rooms, maintaining an even water pressure of 20 lbs. There is also installed in the engine room of each boat a 6 x 10 x 12 Cameron combined air pump and jet condenser. The steam ends of all of these vertical marine pumps are of the standard vertical Cameron type designed to withstand the high steam pressures and tem- none of them exposed to injury. The plunger is reversed by means of two plain tappet valves, absolutely reliable. The steam cylinders and chests are lagged with non-conducting ma- terial, securely encased in sheet izon jackets. The water cylinders are fitted with removable composition bushings which may be readily and quickly removed or replaced without dismount- ing the pumps or disturbing the piping. The water valve chest is cast in one piece with the cylinder, reducing the number of gaskets to the minimum, and special provision is made against air pockets. The pump valves are of the Cam- eron type, the seats being driven in on a taper and one valve stem passing through both the suction and discharge valve, valve seats, springs and spring holders, making it impossible for any part to become loose or disarranged; yet by the removal of this stem all these parts may be taken out. The lift of the» valves is limited by a positive stop. One bonnet covers the entire front of the chest and when removed exposes its whole interior and gives access to every part of it. The area through the valves and passages is made very large to allow the pumps to run at a high speed, but the number of valves has been kept as few as possible to reduce the liability of breakage and to facili- tate replacing them as quickly as possible. A valve chest where it is most efficient and avail- able, by not taking up any floor space and not interfering with the piping. The steam and water ends are connected rigidly by four heavy steel rods secured directly to the cylin- ders by means of substantial lugs, thus allowing the cylinder heads to be removed or replaced without dismantling the pump. The steam piston is secured to the rod by a taper fit and a bronze nut and split pin, and. has removable follower, spring and bull rings; these parts being removable without disturb- ing the piston rod nut. The follower is secured by wrought iron studs, provided with brass nuts and brass split pins. The spring rings, (of which there are two) have scarf joints, and are turned off to size after being cut out and sprung together. The water piston and follower are of composition, secured to the rod by screwing home against a shoulder and with a jam bronze nut and split pin. The piston may be packed from the upper end of the water cylinder. The ring follower is secured by Tobin brass studs, nuts and split pins. The piston rod is made amply large and is in two parts, the steam end being of steel and the water end being of Tobin bronze; they are fastened together by screwing into a clamp nut made in halves, facilitating disconnecting -- the rods. Either piston and its rods can be taken out between the tie rods without dismounting the pump or disturbing the piping, which is a decided advantage where the head room is limited. The steam cylinder stuffing box is bushed with bronze thimble and is fitted with metallic packing suitable for high steam pressure and temperature. The water cylinder stuffing boxes are of ample depth and are fitted with soft packing, and are bushed with bronze thimbles, as are also the glands. MAIN FEED PUMP, STEAMER MANHATTAN,