The
storage of quantities ranging from 300 to 2000 kilos is forbidden in
dwelling-houses and above the latter quantity the storage-place must be
isolated and specially selected. No special permit is required for the
storage of quantities not exceeding 300 kilos. Workmen exposed to carbide
dust arising from the breaking of carbide or otherwise must have their
eyes and respiratory organs suitably protected.
THE PURCHASE OF CARBIDE.--Since calcium carbide is only useful as a means
of preparing acetylene, it should be bought under a guarantee (1) that it
contains less impurities than suffice to render the crude gas dangerous
in respect of spontaneous inflammability, or objectionable in a manner to
be explained later on, when consumed; and (2) that it is capable of
evolving a fixed minimum quantity of acetylene when decomposed by water.
Such determination, however, cannot be carried out by the ordinary
consumer for himself. A generator which is perfectly satisfactory in
general behaviour, and which evolves a sufficient proportion of the
possible total make of gas to be economical, does not of necessity
decompose the carbide quantitatively; nor is it constructed in a fashion
to render an exact measurement of the gas liberated at standard
temperature and pressure easy to obtain.
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