9.]
[Illustration: Fig. 10.]
The distribution of the heated air in the kiln is rarely as uniform as
is supposed, the temperature of the malt on drying floor being very
different at different parts. In illustration of this, the following may
be taken from a statement by Mr. Stopes of the results of an examination
of the temperatures at different parts of a drying floor in a kiln in
Norfolk: "A malting steeping 105 qr. every four days has a kiln 75
feet by 36 feet; an average drying area of under 26 feet per qr. The
consequent depth of green malt when loaded is over 10 inches. The total
area of air inlets is less than 27 feet super. The air outlet exceeds
117 feet, a ratio of 13 to 3. The capacity of head room equals 44,550
feet cube. The area of each tile is 144 inches, with 546 holes, giving
an effective air area of some 32 inches. The ratio of non-effective
metallic surface to air space is thus 9 to 2." The Casella anemometer
gave no indications at several points, and fluctuating up and down
draughts were observable at many others, especially at two corners and
along the center.
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