The
blowpipe must be designed so that it remains sufficiently cool to prevent
polymerisation of the acetylene and deposition of the resultant particles
of carbon or soot within it.
It is important to remember that if a diluent gas, such as nitrogen, is
present, the superior calorific power of acetylene over nearly all gases
should avail to keep the temperature of the flame more nearly up to the
temperature at which hydrogen and oxygen cease to combine. Hence a
blowpipe fed with air and acetylene would give a higher temperature than
any ordinary (atmospheric) coal-gas blowpipe, just as, as has been
explained in Chapter VI., an ordinary acetylene flame has a higher
temperature than a coal-gas flame. It is likely that a blowpipe fed with
"Linde-air" (oxygen diluted with less nitrogen than in the atmosphere)
and acetylene would give as high a limelight effect as the oxy-hydrogen
or oxy-coal-gas blowpipe.
CHAPTER X
CARBURETTED ACETYLENE
Now that atmospheric or Bunsen burners for the consumption of acetylene
for use in lighting by the incandescent system and in heating have been
so much improved that they seem to be within measurable reach of a state
of perfection, there appears to be but little use at the present time for
a modified or diluted acetylene which formerly seemed likely to be
valuable for heating and certain other purposes.
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