STEAM ENGINES 207 



Starting Simple Corliss Engine. In the Corliss engine, the 

 eccentric rod is so constructed and arranged that it may 

 be hooked on or unhooked from the eccentric pin on the wrist- 

 plate at the will of the engineer. After all the preliminary 

 operations have been attended to, the starting bar is shipped 

 into its socket in the wristplate and the throttle is opened. 

 The starting bar is then vibrated back and forth by hand, 

 by which the steam and exhaust valves are operated 

 through the wristplate and valve rods; as soon as the cylinder 

 takes steam, the engine will start. After working the starting 

 bar until the engine has made several revolutions and the 

 flywheel has acquired sufficient momentum to* carry the 

 crank over the dead centers, the hook of the eccentric rod 

 should be allowed to drop upon the pin on the wristplate. 

 As soon as the hook engages with the pin, the starting bar is 

 unshipped and placed in its socket in the floor. The way to 

 determine in which direction the starting bar should be first 

 moved to start the engine ahead is to note the position of the 

 crank, from which the direction in which the piston is to move 

 may be learned. This will indicate which steam valve to- 

 open first; it will then be an easy matter to determine in which 

 direction the starting bar should be moved. If the engine is 

 of the condensing type, the same course of procedure in starting 

 the air and circulating pumps should be followed as with the 

 simple condensing slide-valve engine. 



Stopping Simple Corliss Engine. A Corliss engine is stopped 

 by closing the throttle ahd unhooking the eccentric rod from 

 the pin on the wristplate; this is done by means of the unhook- 

 ing gear provided for the purpose. As soon as the eccentric 

 rod is unhooked from the pin, the starting bar is shipped into 

 its socket in the wristplate and the engine is worked by hand 

 to any point in the revolution of the crank at which it is desired 

 to stop the engine. The procedure is then the same as for the 

 simple slide-valve engine. After stopping a Corliss condensing 

 engine, the same course should be followed as with a slide- 

 valve condensing engine in regard to draining cylinders, closing 

 stop-valves, etc. 



Starting Compound Slide-Valve Engine. Before starting 

 a compound engine, the high-pressure cylinder is warmed up 



