This is intended to prevent the dangerous escape of gas.
(_d_) The water or carbide supply to the generating chamber must be
so arranged that gas will be generated long enough in advance of the
exhaustion of the supply already in the gasholder to allow the using of
all lights without exhausting such supply.
This provides for the continuous working of the apparatus under all
conditions of water-feed and carbide charge, and it obviates the
extinction of lights through intermittent action of the machine.
(_e_) No valves or pet-cocks opening into the room from the gas-
holding part or parts, the draining of which will allow an escape of gas,
are permitted, and condensation from all parts of the apparatus must be
automatically removed without the use of valves or mechanical working
parts.
Such valves and pet-cocks are not essential; their presence increases the
possibility of leakage. The automatic removal of condensation from the
apparatus is essential to the safe working of the machine.
U-traps opening into the room from the gas-holding parts must not be used
for removal of condensation. All sealed drip connexions must be so
arranged as to discharge gas to the blow-off when blown out, and the
seals must be self-restoring upon relief of abnormal pressure.
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