Into this liquid are plunged the receptacles containing the water to be
converted into ice. The chloride of methyl is introduced through the
cock, B, into the body of the cylinder, A, and surrounds and cools the
tubes, as well as the incongealable liquid uninterruptedly circulating
in the latter, by means of a helix, C, set in motion by a belt from the
shop. This liquid is thus greatly lowered in temperature and freezes the
water in the receptacles.
[Illustration: VINCENTS ICE MACHINE. FIG. 5.--VERTICAL SECTION OF THE
PUMP.]
_The Pump_.--The pump in the larger apparatus has two chambers of
unequal diameter, that is to say, it operates after the manner of
compound engines.
The machine under consideration, being one that produces a moderate
quantity of ice, has but a single chamber, as shown in Figs 4, 5, and 6.
It is a suction and force pump, whose piston, E, is solid and formed of
two parts, which are set into each other, and the flanges of which hold
a series of bronze segments.
[Illustration: VINCENTS ICE MACHINE. FIG. 6.--PLAN OF THE PUMP.]
The chamber, properly so-called, is of iron, cast in one piece, and is
surmounted with a rectangular tank, F, in which constantly circulates
the cold water designed for cooling the sides of the cylinder; these
latter always tending to become heated through the compression of the
methyl chloride.
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