The
arrows show its descent through these flues, from which it obliquely
strikes and passes over the flue-plate, then under it, and then out
through the centre back-flue, which is open at the bottom, up into the
smoke-pipe.
The flue-plate is placed obliquely, to accumulate heat by forcing and
compression; for the back space where the smoke enters from the
corner-flues is largest, and decreases toward the front, so that the
hot current is compressed in a narrow space, between the oven-bottom
and the flue-plate at the place where the bent arrows are seen. Here
again it enters a wider space, under the flue-plate, and proceeds to
another narrow one, between the flue-plate and the bottom of the stove,
and thus is compressed and retained longer than if not impeded by these
various contrivances. The heat and smoke also strike the plate
obliquely, and thus, by reflection from its surface, impart more heat
than if the passage was a horizontal one.
The external radiation is regulated by the use of nonconducting plaster
applied to the flue-plate and to the sides of the corner-flues, so
that the heat is prevented from radiating in any direction except
toward the oven.
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