The water-feed should
always be so disposed that the attendant can see at a glance which of the
two (or more) carbide receptacles is in action at any moment, and it
should be also so designed that the supply is automatically diverted to
the second receptacle when the first is wholly exhausted and back again
to the first (unless there are more than two) when the carbide in the
second is entirely gasified. In the sketches G, H, and K, the total space
occupied by the various carbide receptacles is represented as being
considerably smaller than the capacity of the decomposing chamber. Were
this method of construction copied in actual acetylene apparatus, the
first makes of gas would be seriously (perhaps dangerously) contaminated
with air. In practice the receptacles should fit so tightly into the
outer vessel and into one another that when loaded to the utmost extent
permissible--space being left for the swelling of the charge and for the
passage of water and gas--but little room should be left for the
retention of air in the chamber.
ACTION OF CARBIDE-TO-WATER GENERATORS.--The methods which may be adopted
to render a generator automatic when carbide is employed as the moving
material are shown at M, N, and P, in Fig.
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