e 
Doolittle on the Steam Engine. 101 
Art. IX. Remarks on “the neucnarnenay Steam Engine of 
Morey, by Mr. Isaac Doourrr 
YO THE EDITOR OF THE AMERICAN JOURNAL OF SCIENCE, &c. 
Paris, 26th March, 1819. 
Dear Sir, 
And first it may be piopers to state, that the intensity or 
elastic force of the steam is altogether unimportant in the 
point of view in which I shall consider it; it is indifferent 
whether it be fifteen pounds or five hundred to the inch 
area; as I shall only examine what portion of the force ap- 
plied to give the alternating motion to the piston is actually 
employed in producing the rotary movement of the cylin- 
der, and what portion is lost to all useful purposes. 
The enclosed diagram, Fig. L* is a vertical section of the 
machine, (as I understand it from the drawings) perpen- 
dicularly to the axes of rotatio 
he portion of the force which is employed in producing 
a rotary movement varies at every instant with the angle of 
its application, and consequently has a maximum and a min- 
imum. Its effect also, constantly varies with a perpetually 
varying lever at the extremity of which it is applied, the 
effect has therefore also a maximum and a minimum. ese 
last are the only points at which it would be necessary to 
examine the machine in order to appreciate its comparative 
merits; but the points of maximum, depending on the two 
above causes, are not easily determined without having re- 
e figures referred to by Mr. — will be mee on one of the 
: =*Phe 
plates iMustrating Mr. Sullivan’s Steam B 
* 
