[Illustration: FIG. 3.--THE TROMP.]
Since the air that is sucked in during the operation has constantly same
pressure, there is no valve for regulating the entrance of the water
into the vertical conduit. Upon issuing from the latter, the mixture of
air and water strikes the surface of the water in the chamber, b,
and the violence of the shock upon the bottom is deadened by the
interposition of a stone. While the water is escaping through a lateral
aperture in the chamber, b, the air is reaching the tuyeres through a
wooden conduit of square section which is fitted to an aperture in the
upper part of the chamber. This sorry arrangement, which obliges the
mixture of air and water to penetrate the water at the bottom of the
upright conduit, a, retards the separation of the two fluids, and
results in damp air being forced into the crucibles.
_The Trip Hammer_.--Fig. 4 shows the general arrangement of the
apparatus that go to make up the forging mill. The hammer and cam shaft
have their axes parallel, and the latter is placed in the prolongation
of the axis of the wheel.
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