Patent for improvements in dry-kiln furnaces by using “a series of furnaces alternating with a series of heating or radiating drums parallel to and on a plane above the furnace,” (Lines 116-119, p. 2) and valved connected flues. This arrangement allowed the “heat being regulated and so distributed through the kiln as to produce a varying temperature, highest at the end where the lumber is introduced and gradually diminishing toward the opposite end, where it is taken out.” (Lines 21-26) Illustration is included.