Water-seal chambers for covers
depending on a water-seal must be 1-1/2 inches wide and 15 inches deep,
excepting those depending upon the filling of the seal chambers for the
generation of gas, where 9 inches will be sufficient.
(_e_) Must be so designed that the residuum will not clog or affect
the working of the machine and can conveniently be handled and removed.
(_f_) Must be provided with suitable vent connexions to the blow-off
pipe so that residuum may be removed and the generating water replaced
without causing siphoning or introducing air to the gasholder upon
recharging.
This applies to machines of the carbide-feed type.
(_g_) Feed mechanism for machines of the carbide-feed type must be
so designed that the direct fall of carbide from the carbide holder into
the water of the generator is prevented at all positions of the feed
mechanisms; or, when actuated by the rise and fall of a gas-bell, must be
so arranged that the feed-valve will not remain open after the landing of
the bell, and so that the feed valve remains inoperative as long as the
filling opening on the carbide hopper remains open. Feed mechanisms must
always be far enough above the water-level to prevent clogging from the
accumulation of damp lime.
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