e._, not to a greater
degree than will allow easy detection of escaping gas through its odour.
(2) The purifying material shall not yield any products capable of
corroding the gas-mains or fittings.
(3) The purifying material shall, if possible, be efficient as a drying
agent, but the Association does not consider this an absolute necessity.
(4) The purifying material shall not, under working conditions, be
capable of forming explosive compounds or mixtures. It is understood,
naturally, that this condition does not apply to the unavoidable mixture
of acetylene and air formed when recharging the purifier.
(5) The apparatus containing the purifying material shall be simple in
construction, and capable of being recharged by an inexperienced person
without trouble. It shall be so designed as to bring the gas into proper
contact with the material.
(6) The containers in purifiers shall be made of such materials as are
not dangerously affected by the respective purifying materials used.
(7) No purifier shall be sold without a card of instructions suitable or
hanging up in some convenient place. Such instructions shall be of the
most detailed nature, and shall not presuppose any expert knowledge
whatever on the part of the operator.
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