At
length, by dint of great exertion, in about three months every thing
was in readiness, and we determined on the following night to set out
on our perilous expedition.
The machine in which we proposed to embark, was a copper vessel, that
would have been an exact cube of six feet, if the corners and edges
had not been rounded off. It had an opening large enough to receive
our bodies, which was closed by double sliding pannels, with quilted
cloth between them. When these were properly adjusted, the machine
was perfectly air-tight, and strong enough, by means of iron bars running
alternately inside and out, to resist the pressure of the atmosphere,
when the machine should be exhausted of its air, as we took the precaution
to prove by the aid of an air-pump. On the top of the copper chest
and on the outside, we had as much of the lunar metal (which I shall
henceforth call _lunarium_) as we found, by calculation and experiment,
would overcome the weight of the machine, as well as its contents,
and take us to the moon on the third day. As the air which the machine
contained, would not be sufficient for our respiration more than about
six hours, and the chief part of the space we were to pass through was
a mere void, we provided ourselves with a sufficient supply, by condensing
it in a small globular vessel, made partly of iron and partly of lunarium,
to take off its weight.
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