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October, 1913 the conduit d runs to the operating members. The engine is started in the follow- ing manner: In Fig. 1 the compressed air vessel A is opened and either the operating member k or 1 actuated by the operating lever m. The air then flews through the operating member k or 1 into the conduit h or i, places the slide valve f or g in operative position with respect to the cam n or o and then flows through the conduit e into the casing of the starting valve a exerting a pressure on the piston c. The starting valve is opened and air can now flow through the conduit d into the motor cylinder M. According as the slide valve f- or g is operated. the machine will run forward or re- versed. Detail of Engine According to Fig. 2 an auxiliary member p is arranged in the conduit d between the compressed air vessel on the one hand and the slide valves and the starting valve on the other hand. This auxiliary member consists of a cut-off valve formed as a cone valve, and is intended to prevent loss of compressed air and thus to insure certain and speedy. operation of the several parts. The cut-off valve p consists mainly of the chamber valve q held in closed position by a spring b. A conduit r leads from the casing of the cut-off valve p to the operating members k and 1. These operating members k and 1 do not, however, as in Fig. 1, consist of a slide valve, but each operating member includes a valve s and t. In this case the en- gine is started as follows: The com- pressed air vessel A is opened, where- by the chambers u and v of the valve _q and the valves s and t of the oper- ating members k and 1 are placed un- der pressure: the compressed air has to pass a restricted passage w con- necting the chambers u and v. The operating lever m is set to one side or the other according as the engine is run forward or reversed, thereby displacing the member k or 1, with the result that the conduit x is con- nected with the conduit h or i. By continuing to act upon the lever m the valve s or t is opened and the chamber b becomes momentarily ex- hausted because sufficient air cannot Pass through the restricted passage w. Consequently the valve q opens and compressed air can flow through the main conduit d to the starting valve and through the conduits x and h or i to the slide valve f or g. The slide valve f or g is pressed onto its cam n or o and compressed aif then enters through the conduit e, THE MARINE REVIEW ing pressure against the piston c. the casing of the starting valve exert- The starting valve opens and will re- main open so long as the slide valve f or g permits of communication be- tween i or h and e. When the slide valve is pressed back by its cam n or o, the conduit e will be in communica- tion with the atmosphere, the start- ing valve will be relieved and closed under the pressure of its spring b. If the engine is running forward and it is to be reversed, the starting valve is actuated in the manner indicated os SECTION THROUGH by the reversing block. The lever m is arranged in such a manner that in addition to the reversing gear it ac- tuates the fuel pumps and enables the supply of fuel to be cut off during reversing. The starting air first acts in opposition to the movement of the engine, acting as a brake and then causes the engine to rotate in the op- posite direction. 'The operation of handling gear is as follows. (See Sketch V.): - The first operation is to open all valves in manifold-501, and high-pres- sure angle valve-970. In the manifold the left valve allows air to go to the 309 spray air relay valve-461. The middle valve opens to the compressors and the right-hand valve to the air-start- ing flasks. Air then backs up from the air-starting flasks to the top of the compressor piston. High-pres- sure angle-valve-970 allows air to go to the relay valve-985, to the pipe on the opposite side, air going to the top of brake valve-437 and under con- trol valve-424. At the same time air enters through a small hole shown in the valve-986, through pipe in cap nut- 988 to trip valve-431. All this has 2" STAGE DISCHARGE PIPE 2243 2" STAGE CYLINDER HEAO- 233 COOLING WATER OUTLET- 2/82 FLANGE COUPLING - 2442 2~" STAGE SUCTION PIPE -2439 2' STAGE PISTON HEAD- 527 e~P STAGE PISTON RINGS- 53/ REGULATOR VALVE HANOLE- 963 C~ STAGE CYLINDER - 22/ 2*? STAGE PISTON -526 AIR SUCTION REGULATOR VALVE- 957 /¥ STAGE PISTON -525 BRANCH ELL For 12) STAGE DISCHARGE -/55 INTAKE MUFFLER - 956 1¥ STAGE PISTON RINGS-530 AiR COOLER CovERS ~/50 WrisT PIN -5286 AIR COOLER BODY -/-474 1/2" STAGE CYLINDER -2/3 COOLING TUBES -/59 CONNECTING ROD-1/G /2 STAGE DORAIN- 280 HANO-HOLE COVER-/84 IAIN BEARING CAP- 43 CRANKPIN /87 CRANKSHAFT WEB-/87 BAFFLE PLATES- 65 GUARD PLATES - C@ AIR COMPRESSOR been accomplished by opening the three valves in air manifold-501 and high-pressure angle valve-970. The handling gear is now in position for operating the engine, and these valves are always open when the engine is operating or ready to operate. In order to start the engine in eith- er direction, turn the hand wheel-455 in the required direction. This wheel turns a worm-460 which operates worm wheel-459, to the axis of which the various cams, etc., are fixed. As this axis revolves, cam-420 lifts brake valve-437, the plunger underneath which first closes the brake-valve vent.