Nevertheless the production of a temperature somewhat exceeding 100 deg. C.
among the lumps of carbide actually undergoing decomposition can hardly
be avoided in any practical generator. Based on a suggestion in the
"Report of the Committee on Acetylene Generators" which was issued by the
British Home Office in 1902, Fouche has proposed that 130 deg. C., as
measured with the aid of fusible metallic rods, [Footnote: An alloy made
by melting together 55 parts by weight of commercial bismuth and 45 parts
of lead fuses at 127 deg. C., and should be useful in performing the tests.]
should be considered the maximum permissible temperature in any part of a
generator working at full speed for a prolonged period of time. Fouche
adopts this figure on the ground that 130 deg. C. sensibly corresponds with
the temperature at which a yellow substance is formed in a generator by a
process of polymerisation; and, referring to French conditions, states
that few actual apparatus permit the development of so high a
temperature. As a matter of fact, however, a fairly high temperature
among the carbide is less important than in the gas, and perhaps it would
be better to say that the temperature in any part of a generator occupied
by acetylene should not exceed 100 deg.
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