At the present time, when the average burner has a smaller hourly
consumption than 1 foot per hour, it is customary in Germany to quote the
mean illuminating value of acetylene in self-luminous burners as being 1
Hefner unit per 0.70 litre, which, taking
1 Hefner unit = 0.913 English candle
1 English candle = 1.095 Hefner units,
works out to an efficiency of 37 candles per foot in burners probably
consuming between 0.5 and 0.7 foot per hour.
Even when allowance is made for the difficulties in determining
illuminating power, especially when different photometers, different
standards of light, and different observers are concerned, it will be
seen that these results are too irregular to be altogether trustworthy,
and that much more work must be done on this subject before the economy
of the acetylene flame can be appraised with exactitude. However, as
certain fixed data are necessary, the authors have studied those and
other determinations, rejecting some extreme figures, and averaging the
remainder; whence it appears that on an average twin-injector burners of
different sizes should yield light somewhat as follows:
_______________________________________________________
| | | |
| Size of Burner in | Candle-power | Candles |
| Cubic Feet per Hour.
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