The residua of distillation remain almost entirely in the
reservoir, O, from whence they are easily removed. The vapor from the
oil which is disengaged in the vessel, A, goes to the lower retort, D,
in which the transformation of the matter is thoroughly completed. On
leaving the latter, the gas enters the drum, E, at the lower part of
the furnace. To prevent the choking up of the pipe, R, the latter is
provided with a joint permitting of dilatation. The gas on leaving E
goes to the condenser, G G, where it is freed from its tar. The latter
flows out, and the gas proceeds to the washer, J, and the purifiers, I
and I, to be purified. The amount of production is registered by the
meter, L.
When the gas is to be utilized for lighting railway cars or buoys, it
is compressed in the accumulators, T, which are large cylindrical
reservoirs of riveted or welded iron plate.
Compression is effected by means of a pump, F or F', which sucks the
gas into a desiccating cylinder, M, connected with the gasometer of the
works The pump, F, which is used when the production is larger than
usual, has two compressing cylinders of different diameters, one
measuring 170 millimeters and the other 100.
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