The boiler, heated with coke, paraffin, or even acetylene,
must naturally be placed in a separate room of the apparatus-house having
no direct (indoor) communication with the rooms containing the
generators, purifiers, &c. Instead of coils of pipe, "radiators" of the
usual commercial patterns may be adopted; but the immediate source of
heat should be steam, or preferably hot water, and not hot air or
combustion products from the stove. In exposed situations, where the
holder is out of doors, one branch of the flow-pipe should enter and
travel round the seal as previously suggested. Most large country
residences are already provided with suitable heating apparatus for
warming the greenhouses, and part of the heat may be capable of diversion
into the acetylene generator-shed if the latter is erected in a
convenient spot. In fact, if any existing hot-water warming appliances
are already at hand, and if they are powerful enough to do a little more
work, it may be well to put the generator-building in such a position
that it can be efficiently supplied with artificial warmth from those
boilers; for any extra length of main necessary to lead the gas into the
residence from a distant generator will cost less on the revenue account
than the fuel required to feed a special heating arrangement.
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