(_e_) The bell portion of a gasholder constructed on the gasometer
principle must be provided with a substantial guide to its upward
movement, preferably in the centre of the holder, carrying a stop acting
to chock the bell 1 inch above the normal blow-off point.
This tends to insure the proper action of the bell and decreases the
liability of escaping gas.
(_f_) A space of at least three-quarters of an inch must be allowed
between the sides of the tank and the bell.
(_g_) All water-seals must be so arranged that the water-level may
be readily seen and maintained.
19. WATER-SUPPLY.--(_a_) The supply of water to the generator for
generating purposes must not be taken from the water-seal of any
gasholder constructed on the gasometer principle, unless the feed
mechanism is so arranged that the water-seals provided for in Rules 18,
(_c_), (_d_), and (_e_) may be retained under all
conditions. This provides for the proper level of water in the gasholder.
(_b_) In cases where machines of the carbide-feed type are supplied
with water from city water-mains or house-pipes, the pipe connexion must
discharge into the regularly provided filling trap on the generator and
not through a separate continuous connexion leading into the generating
chamber.
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