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Genet’s Memorial: na 34 
& casement B wider than the larger boat, must be built, 
either in wood or stone, and at its base a basin C will be 
excavated lower than the water level of the canal, in order 
to receive the cradle upon which the boats are to a raised or 
lowered down. 
The said basin should of course be calculated to hold 
water enough to float the boats over the cradles, J; lift 
chains are fastened to this, right and left to the walls of the 
casement, and embrace the cradle and the boat at a common 
rgiieesting on very strong axles. 
_ It is now very well understood that this double strong lift 
chain is to coil round a drum, extending over the whole case- 
ment ; that the drum will be coupled, as said before, to a 
large vertical wheel, E, 30 feet in diameter, and that ee 
ous to the lower basin, and higher than its level, will be 
constructed a well, F, in the ground or and on 
sides 
of the well will be graduated sic 
charge the water, G. At the bottom of 
* tened a strong sheave or roller, and iiderir a will runa 
and force, up to the rim of the periphery of the large wheel, 
above where it will terminate and be fastened. If the lift 
is 100 feet perpendicular, an ascension of ten feet in the wel 
performed by the hydrostat, and a revolution of ten feet of 
the large wheel, will ecole it, and place the boat and cra- 
dle, I, on the platform 
é% EXPERIMENT. 
Of hydrostatic tractors to be established on a canal line. 
a strong scow, 20 feet square, A plate Ill, fig. 1, 2, 
brought close to the deposit or impediment, and partly sup- 
ported by it, is a cistern, B, with a sliding gate, C, to admit 
or exclude water. In that cistern is an adapted hydrostat, D, 
with a rack rod, E the teeth of which drive two segments 
cog wheels, vibrating on the same centre, F’, differing in = p 
the small one of the rack rod is a segment of a wheel, 
feet in diameter, and the large one of a wheel eighteen Pw 
in diameter. This meshes into a small cog wie 
adapted to a drum 20 feet in diameter, H, on which 
