Finally, the storage of the gas has
to be provided for.
The Retort.--To get very good results, the retort should be of cast iron,
and have a removable air-tight cover; but, to keep down expense, we will
use an ordinary 2-pound self-opening coffee tin. A short piece of brass
pipe is soldered into the lid near one edge to carry off the gas as it is
generated. To get a fairly gas-tight joint, red-leaded asbestos string
should be rammed tightly between the lid and the tin. The tin may be laid
on an open fire on the slant, the lid end uppermost, and the pipe at the
top, where the gas will collect; or, if you wish to make things more
realistic, you may easily construct an oven with sides and back of
fire-brick, and front of sheet iron, through the hole in which the tin is
pushed horizontally, so that only half an inch projects. This is a.
suitable arrangement for out of doors.
[Illustration: FIG. 191.--Vertical section of condenser.]
The Hydraulic Main.--This is represented in Fig. 190 by a double-necked
bottle, B, standing in a bowl of cold water. The pipe from the retort
passes through the cork in one neck and dips half an inch below the surface
of the water inside.
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