"This much established, I proceed to the second part
of my apparatus. From the lowest part of my balloon,
which is hermetically closed, issue two tubes a little
distance apart. The one starts among the upper layers of the
hydrogen gas, the other amid the lower layers.
"These two pipes are provided at intervals with strong
jointings of india-rubber, which enable them to move in
harmony with the oscillations of the balloon.
"Both of them run down as far as the car, and lose
themselves in an iron receptacle of cylindrical form,
which is called the heat-tank. The latter is closed at
its two ends by two strong plates of the same metal.
"The pipe running from the lower part of the balloon
runs into this cylindrical receptacle through the lower
plate; it penetrates the latter and then takes the form of
a helicoidal or screw-shaped spiral, the rings of which,
rising one over the other, occupy nearly the whole of the
height of the tank. Before again issuing from it, this
spiral runs into a small cone with a concave base, that is
turned downward in the shape of a spherical cap.
"It is from the top of this cone that the second pipe
issues, and it runs, as I have said, into the upper beds of
the balloon.
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