EXPLANATION OF THE PLATES. 



367 



Moloch of high pressure steam, than has ever occurred with low pressure steam during 

 the whole progress of steam navigation, extending now almost to a period of 40 years, 

 and in the course of which nearly 3000 steam vessels have been fitted out and suc- 

 cessfully worked. 



REFERENCES. 



A, The cylinder. 



B B, The sway beams. 



C, The cross head. 



D, Main gudgeon. 

 E E, The side rods. 



F, The fork head. 



G, The connecting rod. 

 H H, The cranks. 



I I, The shafts. 

 K K, The side frames. 

 L L L, The condenser, hot well, and 

 foundation plate, all cast in one piece. 

 M, The air pump. 

 N, The feed pump. 

 0, The sleepers. 

 P, The crank pins. 



a a, The steam nozle and valves, 

 b b, The eduction nozle and valves. 



c, The steam pipe. 



d, The throttle valve. 



e, Handle and rod of throttle valve. 

 f, Starting lever. 



</, Spill of steam valve. 



h, Spill of eduction valve. 



i i i i, Levers for working the 



valves. 



k, Rod to connect levers. 

 / 1, Parallel motion. 

 m, Snifting valves. 

 n, Blow through valve. 

 o, Eccentric rod. 

 p, Eccentric beam and balance. 



Speed of the engine 

 Diameter of wheel . 

 Diameter of the float 

 Diameter of cylinder 

 Length of stroke . 

 Weight of engines (two) 

 Dimensions of boiler 

 Length of paddle board . 

 Width of board . 

 Speed through still water 



DIMENSIONS. 



30 strokes. 



17ft. Gin. 



. . . 17 6 

 3 4 

 3 6 



80 tons. 

 18 feet long, 14 feet 2 inches wide, and 7 feet high. 



9 ft. 2 in. 



. . . . 15 inches. 



13-| miles. 



This boat has run four times a day to and from Gravesend six months, making 

 48,600 miles ; a feat never equalled. 



Beats Red Rover ... 10 minutes. 



Star ... . 



Mercury .... 27 



