320 Mr. Genet’s Reply to Dr. Sones. 
of the said shells, converted now into tin hydrostats, a tin cup; 
open-ended, and having at the bottom two holes supplied with a 
sliding valve, as represented in my specifications ; the one 
communicating with the basin of water, and the other by a 
pipe or leader, with a lower empty basin. It is unquestiotiable 
that the first under valve communicating with the upper basin 
filled with water, being opened, the water will rush from the 
said basin into the tin cup, and, by its upward force, will raise 
one of the hydrostats appended to the beam. And it is also 
unquestionable, that when the ascension of the said hydro- 
stat is finished, by the elevation of the water in the cup to the 
level of the water in the upper basin, if the valve communi- 
cating with the lower empty basin is opened, and the valve 
communicating with the basin of water is shut, the water will 
flow from the cup into the under basin, by the same cause 
which makes water invariably drop from an upper level into 4 
lower one, and which operates in the same way upon the sy- 
phon. It is also unquestionable, that t hydrostat rais- 
ed, ceasing to be pressed upward by the water rising in the 
cup, will return with the beam to its former state of equili- 
3. ‘That if, as soon as the first hydrostat returns, the under 
valve is shut, and the same operation, est on this first 
hydrostat, is repeated upon the second, an alternate or recip- 
rocal vibration will be given to the beam by its ascent. 
4. Thatif the water discharged into the inferior basitj, is 
drawn out, or pumped out, and returned to the upper basin, 
or if fresh water is put into the said basin, and the water dis- 
charged into the lower basin is thrown away, the motion of 
the beam will be continued as long as the manual operation 
which sds aad it, is not suspended. 
at if to the beam is appended ‘an apparatus caleula- 
ted to open and shut alternately, at proper intervals, the two 
valves, and to draw out the water from the lower basin, ‘les is 
more fully explained in my } Memorial,) it seems also evident 
that the hydrostats will rise alternately, and the valves will 
- open and ee as ey as long as water is sapplied to the 
upper basin or drawn out of the lower one, just as well as if 
manual ibor had eaatabated to raise the tumblers against 
the shells of Dr. Jones. ras 
at if that simple machinery being enlar. “ed 
ced Teak a Bash pee water, ona f best Pad © a large 
and deep body of water, ‘and if to the said machinery are 
