FIG. 3.--HALF PLAN OF FREEZER]
At present we shall occupy ourselves with the first of such
applications--the production of cold.
The apparatus serving for the production of cold by this material are
three in number: (1) the _freezer_ (Figs. 1, 2, and 3), in which is
produced the lowering of temperature that converts into ice the water
placed in carafes or any other receptacles; (2) the _pump_ (Figs. 4, 5,
and 6), which sucks the chloride of methyl in a gaseous state up into
the freezer and forces it into the liquefier; and (3) the _liquefier_,
which is nothing else than a spiral condenser in which the chloride of
methyl condenses, and from thence returns to the freezer to serve anew
for the production of cold.
[Illustration: VINCENTS ICE MACHINE. FIG. 4.--THE PUMP (Longitudinal
Section).]
_The Freezer_.--This consists of a rectangular iron tank, 1 meter x 1
meter x 1.5 meters, containing a galvanized plate iron cylinder, A, kept
in place by iron supports. This cylinder contains 24 horizontal tubes,
which are open at the ends and riveted to vertical plates like those of
tubular steam boilers. The tank is filled with a mixture of water and
chloride of calcium, forming, as well known, an incongealable liquid.
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