For albumen and glue drying, leather enameling, tobacco drying, and
purposes where a large space has to be very slightly and equally warmed
when the weather is unfavorable, steam-pipes are generally used, but,
not being always available, an exceedingly good arrangement may be made
by placing at intervals in the room gas burners, of any construction,
close to the floor, and surrounded with a sheet-iron cylinder, say 2 ft.
or 3 ft. high. The top of these cylinders must be connected throughout
with a fairly large flue, which will take the products of combustion
from the whole, and this flue must be carried either horizontally, or
with a slight rise, so as to utilize all the waste heat. The reason for
having a number of stoves at intervals is that the heat in a flue will
not carry, for any useful purpose, more than about 8 ft. or 10 ft., and
a single stove would give an irregular temperature in any except a very
small room. If all are not used at once, the flues of those not in use
may be closed by a damper to prevent down draught.
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