The piston has a stroke of
320 millimeters. The two compressing cylinders are double acting,
and communicate with each other by valves so arranged as to prevent
injurious spaces. The gas drawn from the gasometer is first compressed
in the larger cylinder to a pressure of about 4 atmospheres; then
it passes into the second cylinder, whence it is forced into the
accumulators under a pressure varying from 10 to 12 atmospheres.
For a not very large production, the small pump suffices. This has a
single compressing cylinder connected directly with the piston rod, upon
which acts the steam coming from the boiler, K. This pump compresses the
gas to a pressure of 10 atmospheres, and is capable of storing seven
cubic meters of it per hour.
The carburets of hydrogen which separate in a liquid state through the
effect of the compression of the gas are retained in a cylindrical
receptacle, V, which is located between the pump and the accumulators,
T.
Besides the necessary safety apparatus, there is disposed in front of
the condensers a special valve, N, which allows the gas to escape into
the air if the retorts or the purifying apparatus get choked up.
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