The cylinder heads are hollowed out in the middle, and carry the seats
of the suction valves. Each of the latter communicates with a chamber, G
G, in which debouches the pipe, H, communicating with the cylinder, A,
of the freezer (Figs. 1, 2, and 3).
[Illustration: VINCENTS ICE MACHINE. FIG. 7.--THE LIQUEFIER.]
Above the cylinder there are two delivery valves which give access to
the chamber, D, communicating with the worm of the liquefier (Fig. 7)
through the pipe, J.
The piston of the pump is set in motion by a pulley, K, and a cranked
shaft actuated by a belt from the shafting. The piston head is guided by
a slide keyed to the frame.
[Illustration: VINCENTS ICE MACHINE. FIG. 8.--SECTION OF FLANGE OF THE
WORM.]
_The Liquefier_.--This apparatus consists of a cylindrical tank, L, of
3 mm. thick boiler plate, mounted vertically on a masonry base and
designed to be constantly fed with cool water. It contains a second
cylindrical tank, M, of 6 mm. thick galvanized iron. This latter tank is
provided with a cast-iron cover, on which are mounted the worm, N, and a
pipe, O, connected with the tube of the pressure gauge. To the base of
the tank, M, there is affixed, on a cast iron thimble, a cock, P, for
setting up a communication between the tank and the pipe, R, which
returns to the freezer through the cock, B (Fig.
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