162 Steam-Engine—Physics, §c. 
When those who are acquainted with the steam-engi 
atmospheric kind only, are told that Morey’s cylinder r 
their imaginations may suppose a moving mass as large as 
enormous cylinders they have been accustomed to see+ butit is 
not so; the elastic force of steam requires machinery but 
comparatively small dimensions. 
The revolving engine makes up in activity what in o 
gines is supplied by magnitude. iat 
We will take for example the engine working at the 
manufactory in this vicinity, the cylinder of which has: 
foot stroke and nine inches diameter, and is at leasta ten horse 
power, working with fifty pounds—or, the engine now buildin, 
for the Hartford boat. This engine will have two cylinders 
seventeen inches diameter and eighteen inch stroke; they will 
revolve fifty times a minute. The area of the piston i 
being 227 inches, steam at fifty pounds, will give an 
horse power. : . 
This boat is seventy-seven feet long, twenty-one feet ™ 
and measures one hundred and thirty-six tons. The en 
with its boilers, will occupy sixteen feet by twelve, or one-eighth 
only of the boat; the cylinders being hung on the timbers of 
the deck over the boilers. She is principally intended to 
vessels up the river to Hartford. a 
In towing, it is of importance that the engine adr it of any 
inferior velocity or power, till some momentum is had. An 3 
engine working by atmospheric pressure does not admit of ah 
And as the boat herself, at the moment of commencing the oP? a 
conspicuous labours and enterprise in the estab 
steam-boats, the public duly honours. His active ! 
conceived of its utility; and he would have obtained @ 
had not the previous employment of steam in this way 
the award of arbitrators on the question been in my favo 
