94 Animadversions on Mr. GeneVs Memorial, tye. 



to a high altitude." (Memorial, p. 39.) This copper vessel, 

 is, in the example given, to be a spherical balloon of fifteen 

 feet in diameter, and it is said, will contain 15,000 feet of air, 

 and allowing the 30 per cent, before given in, and reckoning 

 nothing for the weight of the copper, the chain, &c. is to be 

 pressed by the upward force of water, with a power of 1 50,- 

 000 lbs. or 75 tons. This copper ball is to be placed in a 

 well into which water when wanted may be admitted. This 

 well iif to be 16 feet broad, and thirty feet deep ; in this, 

 the hydrostat is to be capable of rising to the height of ten 

 feet, and by means of a rope or chain, like that of the 

 (erostat, is to raise a canal boat, weighing seventy-five tons, 

 to the height of one hundred feet; its power being increas- 

 ed ten fold, by causing a wheel to turn a pinion y 1 ^ of its di- 

 ameter. Comment and reasoning are here unnecessary, to 

 those who would be capable of understanding them. 



Passing over several applications of this new . power, as 

 they are mere variations of that just given, I proceed to the 

 hydronaut, in which it is to be used as a substitute for the 

 steam engine. It will be seen from the remarks of Mr. Ge- 

 net in his ' reply, 1 that I had selected this as the pricipal ob- 

 ject of notice, in the Franklin Journal, for January last. I 

 beg leave to repeat a part of those observations, and to add 

 a few others on the same subject; but first let us hear our 

 author speak for himself. (Memorial, p. 62.) How can I 

 procure the same alternate motion of the hydrostat ? By 

 immersing it alternately in two different fluids, air and wa- 

 ter ; but as a single hydrostat could not accomplish that ob- 

 ject, and procure an alternate motion, rapid enough to per- 

 petuate the rotatory motion, two must be employed ; and 

 by doing so, there will be no disparagement between the 

 steam and the hydrostatic engine ; since it is well known 

 that it has been found necessary to introduce two cylinders 

 in the steam engine, to perfect the rotatory motion, and re- 

 plenish the deficiency of a single cylinder. 1 ' 



Mr. Genet, as usual, errs when speaking of the steam 

 engine, it being " well known' 1 that, although two cylinders 

 have been sometimes used, it has not been found necessary 

 to introduce them " to perfect the rotatory motion, and replen- 

 ish the deficiency of a single cylinder ;" and that they have 

 been abandoned, in nearly every instance, excepting in the 

 loco-motive carriage. This gentleman is perpetually haunt- 

 ed by the ghost of the atmospheric engine, and must in his 



