So far as mere dissolution of gas is concerned, the loss may be
reduced by having a circular disc of wood, &c., a little smaller in
diameter than the boll, floating on the water of a plain tank.
EFFECT OF STORAGE IN GASHOLDER ON ACETYLENE.--It is perfectly true, as
has been stated elsewhere, that the gas coming from an acetylene
generator loses some of its illuminating power if it is stored over water
for any great length of time; such loss being given by Nichols as 94 per
cent, in five months, and having been found by one of the authors as 0.63
per cent. per day--figures which stand in fair agreement with one
another. This wastage is not due to any decomposition of the acetylene in
contact with water, but depends on the various solubilities of the
different gases which compose the product obtained from commercial
calcium carbide. Inasmuch as an acetylene evolved in the best generator
contains some foreign ingredients, and inasmuch as an inferior product
contains more (_cf._ Chapter V.), the contents of a holder are never
pure; but as those contents are principally made up of acetylene itself,
that gas stands at a higher partial pressure in the holder than the
impurities.
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