(_m_) Every machine must be plainly marked with the maximum number
of lights it is designed to supply, the amount of carbide necessary for a
single charge, the manufacturer's name and the name of the machine.
16. GENERATING CHAMBERS.--(_a_) Must be constructed of galvanised
iron or steel not less than No. 24 U.S. Standard gauge in thickness for
capacities up to and including 20 gallons, not less than No. 22 U.S.
Standard gauge for capacities between 20 and 75 gallons, and not less
than No. 20 U.S. Standard gauge for capacities in excess of 75 gallons.
(_b_) Must each be connected with the gasholder in such a manner
that they will, at all times, give open connexion either to the gasholder
or to the blow-off pipe to the outer air.
This prevents dangerous pressure within or the escape of gas from the
generating chamber.
(_c_) Must be so constructed that not more than 5 pounds of carbide
can be acted upon at once, in machines which apply water in small
quantities to the carbide.
This tends to reduce the danger of overheating and excessive after-
generation by providing for division of the carbide charges in machines
of this type.
(_d_) Must be provided with covers having secure fastenings to hold
them properly in place and those relying on a water-seal must be
submerged in at least 12 inches of water.
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