Surrounding the pipes are plates of sheet iron, inclined at the angle
shown in Fig. 2. The object of the plates is to prevent the heated air
of the room from passing up to the ceiling, and send it out into the
room. To prevent any of the pipes acting as chimneys, and bringing the
products of combustion back into the room, as well as to avoid any
back-pressure, a damper is attached to the outlet receptacle. The
heated gas becomes cooled so much (to about 100 deg. Fahr.) that water is
condensed and precipitated, and collects in the vessel below the
outlet. Each burner has a separate cock, by which it may be kept
closed, half-open, or open. To obviate danger of explosion, there is a
strip of sheet iron in front of the burners, which prevents their
being lighted when in a vertical position; so that, in case any
unburned gas gets into the pipes, it cannot be ignited, for the
burners can only be lighted when inclined to the front. In starting
the stove the burners are lighted, in the inclined position; the chain
from the damper pulled up; the burners set vertical; and, as soon as
they are all drawing well into the tubes, the damper is closed.
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