Galvanising is strongly recommended as a protection against oxidation,
and it may to advantage be reinforced by a thorough coating of asphaltum
or similar material.
(_b_) Must contain no copper or alloy of copper in contact with
acetylene, excepting in valves.
(_c_) Must be so arranged that generation will take place without
overheating; temperatures in excess of 500 deg. F. to be considered
excessive.
(_d_) Must be provided with means for automatic removal of
condensation from gas passages.
(_e_) Must be provided with suitable protection against freezing of
any water contained in the apparatus.
No salt or other corrosive chemical is permissible as a protection
against freezing.
(_f_) Must in general comply with the requirements governing the
construction of apparatus for isolated installations so far as they are
applicable.
(_g_) Must be so arranged as to insure correct procedure in
recharging and cleaning.
(_h_) Generators of the carbide-feed type must be provided with some
form of approved measuring device to enable the attendant to determine
when the maximum allowable quantity of carbide has been fed into the
generating chamber.
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