The Flow Of Gases In Furnaces

CEMENTATION FURNACES

115

building larger and larger kilns is merely to increase the height and diameter.
However, there are limits upon the height, due to the crushing of the lower
tiers and the difficulty of securing an even burn throughout the kiln. These
difficulties do not appear in the small kilns.)

VIII. CEMENTATION FURNACES

Mg. 87 shows an old type of cementation furnace cited in the
lectures of Professor Ledebur. The hot gases rising from the

FIG. 87.

PIG. 88.
firebox are subdivided immediately into ascending currents, which
are supposed to envelop and surround the boxes containing the
iron bars packed in charcoal. Much better results would be