The water delivery from the water-tank _B_ then
takes place into a trough with outlets at different levels for each
generating chamber. By inspection of this trough it may be seen at once
whether the charge in any generating chamber is unattacked, in course of
attack, or exhausted.
[Illustration: FIG. 40.--THE "A1" GENERATING PLANT OF THE ACETYLENE
CORPORATION OF GREAT BRITAIN, LTD.]
(2) Automatic; water-to-carbide; contact.
The same firm also makes the "Corporation Flexible-Tube Generator," which
is less costly than the "A1" (_vide supra_). The supply of water to
the generating vessels takes place from the tank of the equalising bell
gasholder and is controlled by a projection on the bell which depresses a
flexible tube delivering into the generating vessels below the level of
the water inlet to the tube.
(3) Automatic; water-to-carbide; "drawer."
The same firm also makes a generator known as the "A-to-Z," which is less
costly than either of the above. In it water is supplied from the tank of
a bell gasholder to a drawer type of generator placed in the base of the
gasholder tank. The supply of water is controlled by an external piston-
valve actuated through the rise and fall of the bell of the gasholder.
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