Sullivan on the Revolving Engine. 113 
an The springs which keep the valves together, 
90 The Throttle valve box and pipes leading steam to the cyl- 
inders, 
pp. Pipes leading from the cylinders, 
rr The intermediate shaft, 
s The clutch box, to connect the shaft and wheel, 
t The clutch box lever, 
uu Cog wheels communicating motion—the reverse of this 
proportion is found in experience preferable, 
ww The main shaft, 
xx The safety valves, 
zz The gear and crank for the supply pump. 
Wig. 2. ‘The inside or face of the valves shewing the grooves, 
The cross pipes and double passage cocks to produce the 
back motion, 
4. Wheels with moveable floats, 
5. ‘The gas fire apparatus aud pipes—not placed in this in- 
stance to the best advantage. The vessel should be 
placed on its head. 
6. Profile of a Boat the boilers above deck, (see note b.) 
7. The stern view of the revolving engine applied to the axis, 
cranks and stern propellers, 
8. Outline of the apparatus attached to the stern, 
10. Profile of the stern with paddles. 
Note a. By proportioning the revolutions of the engine to the 
motion of the paddles or wheels so that the engine will ordinarily 
move moderately and the wheels fast ; we are able when the vessel 
has speed, either from the wind or steam, to superadd the power of 
this engine to her acquired momentum, so that the maximum of 
effect may be attained. If the engine has power to go too fast for 
the paddles they may be made to take more hold of the water— 
and the reverse. 
Note 6. It being desirable that boilers should be placed as much 
a-part from the loading and passengers as possible, the recently 
invented fuel will permit of arrangements very favourable to the 
economy of room. 
Note c. The advantages of a double engine are perhaps very 
important in boats of the largest class, but a single engine applied 
to the stern propellers, is the most simple and lightest form of the 
engine; and is best adapted to those rivers of our country which 
flow tarough alluvial land, and consequently make their channels 
Vou. II.....No. 1. 15 
