In this way the size of the lamp for a given
number of candle-hours would be reduced below that of any type of actual
generator, and the troubles of after-generation, always more or less
experienced in holderless generators, would be entirely done away with.
Dissolved acetylene is also very useful for acetylene welding or
autogenous soldering.
The advantages of compressed and absorbed acetylene depend on the small
bulk and weight of the apparatus per unit of light, on the fact that no
amount of agitation can affect the evolution of gas (as may happen with
an ordinary acetylene generator), on the absence of any liquid which may
freeze in winter, and on there being no need for skilled attention except
when the cylinders are being changed. These vessels weigh between 2.5 and
3 kilos, per 1 litre capacity (normal) and since they are charged with
100 times their apparent volume of acetylene, they may be said to weigh 1
kilo, per 33 litres of available acetylene, or roughly 2 lb. per cubic
foot, or, again, if half-foot burners are used, 2 lb. per 36 candle-
hours. According to Fouche, if electricity obtained from lead
accumulators is compared with acetylene on the basis of the weight of
apparatus needed to evolve a certain quantify of light, 1 kilo, of
acetylene cylinder is equal to 1.
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