Sullivan on the Revolving Engine. iii 
sufficiently free from objection. 
he combination however, of two cylinders at right an- 
gles, has the same effect. 1ey produce a continuity of 
the power, whatever that is; and enable the engine to 
work with equable motion, without a balance wheel, objec- 
tionable in navigation on account of its weight, as well as 
eats i 
know that it has heretofore been done in a form or manner 
ost. - ; 
We are enabled by this form of the engine to give the 
power of steam to canal navigation, and shallow inland wa- 
ters; to apply the power directly to the axis of the water 
wheel of the boat which is thus made the connecting axis of 
the engine. No form of the Steam Boat can be more sim- 
pie. 
The boats for this purpose have a peculiar form, which 
gives a recess or chamber at the stern, for the play of the 
wheel, or crank paddles of a peculiar construction, so that 
nothing encumbers the sides. 
The boilers when the boat is large, stand on or above 
the deck, covered from the air and weather. The whole 
body of the vessel being unincumbered and free for the use 
of loading or of passengers. = ~ , 
n important saving of expense may be made in conse- 
quence of the reduced size of the machine ; for its complete 
adaptation to the use of high steam admits of a great power, — 
thus exerted in a small compass. Expense is also saved in 
the manner of attaching the engine to the boat or vessel, so 
as not to depend on the stiffness or firmness of the bottom ; 
the center of reaction being the centre of the engine. 
When this kind of engine shall be applied to steam bat- 
teries, it will be found capable of propelling them perhaps 
with more than usual velocity, and at much less expense : 
