Neglecting the effect
of this carbon, which will be considered in the following paragraph, it
is manifest that the acetylene issuing from a hot burner--assuming its
temperature to exceed the minimum capable of determining polymerisation--
may emit less light per unit of volume than the acetylene escaping from a
cold burner. Proof of this statement is to be found in some experiments
described by Bullier, who observed that when a small "Manchester" or
fish-tail burner was allowed to become naturally hot, the quantity of gas
needed to give the light of one candle (uncorrected) was 1.32 litres, but
when the burner was kept cool by providing it with a jacket in which
water was constantly circulating, only 1.13 litres of acetylene were
necessary to obtain the same illuminating value, this being an economy of
16 per cent.
EARLY BURNERS.--One of the chief difficulties encountered in the early
days of the acetylene industry was the design of a satisfactory burner
which should possess a life of reasonable length. The first burners tried
were ordinary oil-gas jets, which resemble the fish-tails used with coal-
gas, but made smaller in every part to allow for the higher illuminating
power of the oil-gas or acetylene per unit of volume.
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