, EE a aared 
ee tees eee 
jada 
Genet’s Memorial. . 345 
ter, as far up as the water line; half the quantity, therefore, 
of all the water in the reservoir, which extends to the line C. 
This communicates with the trunks of two powerful air 
pumps, DD, from which the water raised by their suction will 
flow in a constant stream into a sink, E, entirely open to the 
main water under the vessel. “Below each cistern are slide 
valves, FF, regulated so as to open and shut at proper inter- 
vals, immediately discharging water, and cutting off the ex- 
ternal waters. e cisterns are of cast iron, open ended, 
and each fitted to receive, without much friction, the hydro- 
stats, GG, calculated to contain 160 cubic feet of air or gas, 
and which, being in an erect position, as a long spheroid, 
made of copper, braced and soldered, alike in weight and ca- 
pacity, will be calculated to receive on the surface of their in- 
ferior hemisphere, the forcing pressure of the intruding wa- 
ter, and to support a strong connecting rod, HH, fastened 
to the hydrostat by a joint, and affixed to the beam, I, bya 
similar joint. 
So far this hydraulic machinery is entirely ruled by that 
beam, 24 feet long, of iron, and supported at its centre by a 
strong fulcrum, J, upon w ich it will move according to the 
upward force that is to make it vibrate. It bears, also, on 
each of its arms, the legs of a rider, K, 14 feet high, to each 
of which is affixed a supplementary rod; and between the 
connecting rod of the hydrostats and the fulcrum of the 
beam, are affixed the two piston-rods, LL, and at the end of 
the supplementary rods, are the regulators of the valves, M, 
which by the means of a detent, N, must open or shut ac- 
cording to the ascension or fall of each hydrostat. The ri- 
der, therefore, is a lever, imparting motion by a bar, O, toa 
crank, P, which plays on a cog wheel, Q, and the said cog 
wheel, by the means of a small pinion, R, fastened on the 
centre of the wheel shaft, gives three revolutions to the water 
wheel, S, against one of the cog wheels. [i will happen, there- 
fore, that from seven ascensions of the hydrostats, the water 
wh [pees i ian tu tu. t 
- 
of the arms of the water wheel, T are loaded with cast iron 
buckets, instead of wooden ones, in order to counterbalance 
the dead point, U, and answer the same purpose as the arms 
of a fly wheel, to continue the motion when the power de- 
creases. ‘Two hand levers VV are affixed to a small bucket, 
W, that supports the detent and regulators of the slide 
VOL. XI,——NO. a 44 
