Engineering Wonders of the World
Volume I

34 ENGINEERING WONDERS OF THE WORLD. Fig. 8.—A QUADRUPLE-EXPANSION PISTON TYPE MARINE ENGINE. (Photo, IK. Parry and Son.) (For Explanation see Text.) the forward to the after end of th© engine, the cylinders are in the following order : high pressure, A; low pressure, b ; second interme- diate, c ; and first intermediate, d. Now let us trace the course of the steam through the engine. It first passes from the boilers through the main stop-valve on the top of each boiler, through the The Course main gteam piping, and enters of the Steam. , . ... the engine by the regulating- valve E. This valve, seen in the right-hand top corner of our illustration, is worked by the hand-wheel marked f, placed within conven- ient reach of the engineer standing on the platform at the front of the engine, and it is by means of this hand-wheel that the admis- sion of steam to the engine is regulated. The steam passes through the regulating - valve into the high-pressure steam-chest, G, and thence into the high-pressure cylinder, a, by the top and bottom steam ports alternately. The steam having completed its work in the high-pressure cylinder, a, it exhausts by the pipe marked q to the first intermediate valve chest, R, from which it passes to the first intermediate cylinder, d, where precisely the