Mr. Genet’s Reply to Dr. Jones. 931 
procured by the pressure of the water against the hydrostats, 
and their own levity being filled with gas or air, is superior 
to the force spent on the paddle-wheels, and on the pumps, 
and the rest of the machinery, the hydronant will be propel- 
led by its own self-created power, or rather by the artificial 
current of water created, and the transient usé made of its 
upward force. But, Sir, on this last hypothesis, and ow this 
one alone, as I mentioned in my last letter, several mechani= 
cians, who are far from being as adverse to my plan as Dr. 
Jones, raise doubts on the success of the iydronaut: They 
presume that the power of the hydrostats will be proportionate 
to the identical weight of the water admitted into the cylin- 
ders, and that the weight of the water discharged into the 
ower basin or recipient, being equal to the weight of the wa- 
ter in the cylinder, an equipoise, arid of course a stagnation 
will take place, after the first ascension of the hydrostat, as 
Dr. Jones predicts, without assigning any reason for it. 
There is, I admit, an apparent plausibility in that 6b+ 
jection, and I had guarded in my Memoir against the possi- 
bility of a saperabundance of water in the recipient, observing; 
that if the said recipient should retain more water than the 
true air pump, otherwise called forcing pump, could raise, 
extra pumps, similar to the best of those used on board ships, . 
could, without much additional trouble and expensé, be used 
to keep up the alternate action of the hydrostats.—T am not, 
however, converted to that opinion, and I am still melined to 
think, that the pressure of the water rising, in what I have 
hitherto in this letter called the cup, and now by its proper 
name the cylinder, against the inferior area or foot, Be hy 
the exterior columns of water, entering into the cylinder by 
nder valve called in my Memoir the discharging valve ; 
and that every foot in the elevation of the exterior columns of 
the weight o ne 
carpet subsequently into the recipients ; because, F repeat 
41 
VOL. XII.—NO. 2 
is 
