112 Sullivan on the Revolving Engine. 
but its great utility will be found in facilitating water car- 
riage on those rivers, which are at times shallow, and those 
which are rendered more extensively navigable by canals 
around their falls 
am, very respectfully, — &e. 
Y . ry J. L. SULLIVAN. 
Boston, October, 1819. 
Py In the Hartford Boat, we used the Tar or Gas 
fire with good effect : but [ am not able to state yet, precise- 
ly the proportion of saving. The men about the engine 
— thought it equal to as much again wood as they 
sed. 
“When I have made some decisive trials I shall communi- 
cate the result. 
Remark. We understand that Mr. Sullivan and Mr. Mo- 
rey have in the investigation of the economy of the liquid 
fuel of steam engines, (or tar and steam fire,) made some 
discoveries and improvements which bid fair to be very use- 
ful and economical. They are in practice ina steam en- 
gine which carries the recently invented self directing lathe, 
which makes ships’-blocks, lasts and other irregularly form- - 
ed articles. 
Explanation of the plates referred to in the preceding communi- 
cation. 
Index to the annexed plate of the Revolving Steam Engine. 
aaa Boilers 
bb Cylinders 
ce Connterpese, {not preset necessary as the cylinders 
unte er.) 
coun 
dd Frames holding the cylinders, &e. 
ee Axes on which the frames rotate, 
ff Fixed cranks or centers, 
gg The pitman or bar, 
hh Cross — 
ii The Pisto 
ok ane Ribs isch preserve the parallel movement of the 
11 The yotat valve 
mm The fixed cinhtehyiati to the rotary valve, 
