The gas, on meeting the water, is cooled, and some of
the steam in it is condensed, also most of the tar present, which floats on
the top of the water. From the bottle the gas passes on to the Condensers,
where the process of cooling is completed gradually. The condenser (Fig.
191) is so designed as to cause the gas to pass through several pipes in
succession. The base consists of a tin box, 6 inches long, 4 wide, and
1-3/4 deep. This is divided longitudinally down the centre by a 1-1/2-inch
partition, soldered to the bottom and sides; and the two divisions are
again subdivided, as shown in Fig. 192, by shorter cross partitions.
[Illustration: FIG. 192.--Plan of condenser.]
For the condensing pipes, "compo" tubing of 1/2-inch outside diameter is
convenient. The amount required will, of course, depend on the number of
pipes used and the length of the individual pipes. The design shows 6
pipes, each 3 feet long, bent to a semicircular curve (Fig. 191) at the
middle to form very long, narrow horse-shoes. The pipes are supported at
the curve by the crossbar, S (Fig. 191), of a frame, and their ends enter
short pieces of brass tubing soldered into holes in the bottom of the tin
box.
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