The methods necessarily adopted for purifying the crude gas are treated
of in Chapter V.; but it is manifest now that no purifying material can
prove efficient unless the acetylene passes through it at a uniform rate,
and at one which is as slow as other conditions permit. For this reason
the proper position of the holder in an acetylene installation is before
the purifier, and immediately after the condenser or washer which adjoins
the generator. By this method of design the holder is filled up
irregularly, the gas passing into it sometimes at full speed, sometimes
at an imperceptible rate; but if the holder is well balanced and guided
this is a matter of no consequence. Out of the holder, on the other hand,
the gas issues at a rate which is dependent upon the number and capacity
of the burners in operation at any moment; and in ordinary conditions
this rate is so much more uniform during the whole of an evening than the
rate at which the gas is evolved from the carbide, that a purifier placed
after the holder is given a far better opportunity of extracting the
impurities from the acetylene than it would have were it situated before
the holder, as is invariably the case on coal-gas works.
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