Employing the data
given in previous tables, it appears that 38.5 candles can be won from
plain acetylene in a self-luminous burner, and 103 candles therefrom in
an incandescent burner at the same price as 25.5-29.1 and 78-87 candles
can be obtained from carburetted acetylene; whence it follows that at
English prices petrolised acetylene is more expensive as an illuminant in
either system of combustion than the simple gas, while benzolised
acetylene, burnt under the mantle only, is more nearly equal to the
simple gas from a pecuniary aspect. But considering the calorific value,
it appears that for a given sum of money only 363 calories can be
obtained from plain acetylene, while petrolised acetylene yields 516, and
benzolised acetylene 658; so that for all heating or cooking purposes
(and also for driving small motors) carburetted acetylene exhibits a
notable economy. Inasmuch as the partial saturation of acetylene with any
combustible vapour is an operation of extreme simplicity, requiring no
power or supervision beyond the occasional recharging of the carburettor,
it is manifest that the original main coming from the generator supplying
any large establishment where much warming, cooking (or motor driving)
might conveniently be done with the gas could be divided within the
plant-house, one branch supplying all, or nearly all, the lighting
burners with plain acetylene, and the other branch communicating with a
carburettor, so that all, or nearly all, the warming and cooking stoves
(and the motor) should be supplied with the more economical carburetted
acetylene.
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