This combustion of 612 grammes of
combustible per effective horse hour is remarkable, and fully shows what
may be expected of the gas motor supplied by a gas generator in putting
to profit certain improvements that will hereafter be possible, such,
for example, as the lightening of the movable parts of the motor, the
bettering of its organic rendering (now quite feeble), the use of better
oils, the reduction of the consumption of water, the superheating of the
steam injected into the gas generator, etc.
A well constructed steam engine, carefully kept in repair and as much
improved as it is possible to make it, would certainly consume twice as
much coal to produce the same quantity of effective work, say at least
1,200 grammes per horse hour. But, as has been objected with reason, it
does not suffice to compare the figures as to the consumption of fuel in
order to institute a serious comparison between the steam engine and the
motor using poor gas.
The gas generator requires the use of English anthracite, while a steam
boiler is heated with any kind of coal. The prices of unity of weight
are therefore very different.
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