. Seasoning of wood; a treatise on the natural and artificial processes employed in the preparation of lumber for manufacture . Fig. 31. Section through a typical Moist-air Dry Kiln. medium temperature is required. In Fig. 34 will be seenthe Vertical Type Heating Coils which is recommendedwhere exhaust or low-pressure steam is to be used, or maybe used with live or high-pressure steam when high tem-peratures are desired. These heating coils are usually installed in sections,which permit any degree of heat from the minimum tothe maximum to be maintained by the elimination of,or the addition of,
. Seasoning of wood; a treatise on the natural and artificial processes employed in the preparation of lumber for manufacture . Fig. 31. Section through a typical Moist-air Dry Kiln. medium temperature is required. In Fig. 34 will be seenthe Vertical Type Heating Coils which is recommendedwhere exhaust or low-pressure steam is to be used, or maybe used with live or high-pressure steam when high tem-peratures are desired. These heating coils are usually installed in sections,which permit any degree of heat from the minimum tothe maximum to be maintained by the elimination of,or the addition of, any number of heating sections. Thisgives a dry kiln for the drying of green softwoods, or byshutting off a portion of the radiating coils— thus re-ducing the temperature — a dry kiln for drying hard-woods, that will not stand the maximum degree of heat. In the Moist-air or Natural Draft type of dry kiln, any 190 SEASONING OF WOOD. ^ o3 <1 bC TYPES OF DRY KILNS 191
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