This has led to a change in the arrangement of the generator in the
apparatus designed for the use of chalk.
It consists in this case of a leaden vessel, D, having a hemispherical
bottom set into a cylindrical cast iron base, K, and of an agitator
similar to that shown in Fig. 11, for keeping the chalk in suspension in
the water. These latter materials are introduced through the mouth, B
(Fig. 3). Then a special receptacle, C, of lead, shown in detail in Fig.
10, and the cock, c, of which is kept closed, is filled with sulphuric
acid. The acid is not introduced directly into the vessel, C, but is
poured into the cylinder, C, whose sides contain numerous apertures
which prevent foreign materials from passing into the siphon tube c,
and obstructing it.
To put the apparatus in operation, the acid cock, c, is opened and the
wheel, A, is turned, thus setting in motion both the pump piston, P, and
the agitator, within S and D. Then the play of the pump produces a
suction in the washers and from thence in the generator and causes the
acid in the vessel, C, to flow into the generator through the leaden
siphon tubes, c. Coming in contact with the chalk in suspension, the
acid produces a disengagement of gas which soon establishes sufficient
pressure to stop the flow of the acid and drive it back into the siphon
tube. The play of the pump continuing, a new suction takes place and
consequently a momentary flow of acid and a new disengagement of gas.
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