Te eee 
Genet’s Memorial. 347 
like the wings of a bird, or the fins of a fish, they exercise a 
perpendicular and backward pressure by their form and con- 
struction. hese wheels are indeed like an expanded wing o: 
, K, when one half of them fastened to their axles b 
hinges, and liberated from a case, are acted on bya circular 
spring, L, they are compelled to expand a surface of 100 
square feet. The force and power of which in comparison 
with the incumbent weight and contingencies we now omit. 
But there are two other powers necessary to complete the 
analogy with birds and fish ; the one is in the head, the other 
in the tail. Inverting a little the order in which the author 
has described them, we will then say, that in imitation of the 
first, which with their neck and sharp bills, and of the other, 
which with their angular mouths, go where they please, he 
has provided the zeronaut, Ist, with an air cutter, hanging to 
hinges, O, in due length and breadth, and which may be 
raised or lowered. by cords in pulleys, to describe either an 
ascending, lowering, or horizontal line ; and, 2d, with a tail, 
or arudder, not only to steer the machine, but also to supply 
it with an additional force of propulsion, by the means of an 
oscillatory motion, like that of sculling a boat. This is pro- 
eured by a pilot wheel, N, turning over a barrel, &c.; or, 
according to very well known methods. 
But this is not alls; when birds want to alight they pause, 
or turn round, extending their wings very much to prevent 
too sudden a fall; and then, contracting more or-less one or 
the other wing, they alight exactly where they please. How 
this nice faculty is imparted to the zronaut, we will deseribe. 
Itis by means of two leeboards, or wings, P, 22 feet in 
width and 12 in length, fastened under deck by a ring and © 
bolt, moving within semicircular staples, and which may be 
hauled in and out by two ropes running through sheeves. 
These wings could also serve as parachutes, if the rostat 
should burst, and they may answer many obvious and excel- 
lent purposes. : 
At each end of the deck, are two laboratories, Q, to sup- 
ply the gas requisite to replenish the wxrostat by the stop- 
cocks, R ; the rest of the space is to be employed for the ac- 
commodation of freight and passengers. _'T, is the rudder or 
tail, and U, the discharge valve for the gas. 
Thus far we have succinctly described the seronaut of Mr. 
Genet, offering at the same time a view of all his plates. We 
