169 
Hydrostatic Engine . 
Or power will be 1 5 pounds upon every square inch of the piston. 
When the fall is sixty-six feet, the power is 30 pounds upon the 
square inch, and a fall of 132 feet will give a power of 60 pounds, 
Upon every square inch of the piston, and so on. In order to apply 
the power thus acquired to machinery, it is necessary that a rota- 
tory movement should be produced. The manner in which this is 
effected is shewn by Fig. 2 ; by which it appears that the rectiii- 
near movement bears the same relation to the rotatory, that a line 
of tangent does to its circle ; and this indeed is the only direction, 
in which a power acting in a right line, can produce a rotatory 
movement, without a very considerable loss. 
It may be objected that the unavoidable friction to which the 
engine is liable, is sufficient to counterbalance all the advantages 
it might otherwise have, over the wheel, but an undeniable fact, 
which we will here introduce, will place this point beyond all con- 
troversy. Ah engine has been erected, at Mr* Bayly’s brewery in 
Germantown, for the purpose of grinding malt. It is constructed 
on the original plan, viz. with sliders to regulate the movements of 
the rack. It is situated on a small stream of water, rising out of the 
ground, a few rods above the dam. The fall from the surface of 
the water in the dam, to the bottom of the machine, is equal to 25 
feet perpendicular height. With this fall, grinding at the rate of 
20 bushels per hour, the engine expends 100 gallons of water per 
minute. A grist-mill having an equal fall of water, and grinding at 
the rate of bushels of wheat per hour, requires about 400 gal- 
lons of water per minute, to turn it. 
Farther information on the subject and licenses may be obtain- 
ed, by applying to the patentees in Germantown, near Philadelphia. 
Mr . Hauto* s Hydrostatic Engine . I observe there has been a 
kind of newspaper controversy between the proprietors of this 
machine, and Mr. Perkins, in which the latter insists that the water 
is not so advantageously applied by Messrs. Long and Hauto, as 
if it fell on a common water wheel. I will not pretend to say but 
that the water power might so be managed with a water wheel per- 
fectly constructed, as to do equal work, with the machine contrive 
ed by Messrs. Long and Hauto ; but it seems to me, that their 
machinery could be placed in situations where a water wheel could 
not be employed — that in many cases it would be cheaper than a 
water wheel-*-and in all cases more efficacious where the stream of 
water from the top to the bottom of the fall was not preserved in 
Uniform continuity, which in waterwheels, is not, as I think, always 
Vol. III. Y 
