The kiln drying of lumber; a practical and theoretical treatise . the stickers should run inthe direction of the air current. The boards shouldnot be placed so as to baffle the air currents. Other-wise the air will short circuit the piles and not passthrough them. For example, in a progressive kiln in which the airenters at one end and passes out at the other, so thatthe general movement of the air is in a somewhathorizontal path through the kiln lengthwise, flat piling,crosswise, is a satisfactory method, provided that theboards are spaced sufficiently far apart to allow the airto sink downwa
The kiln drying of lumber; a practical and theoretical treatise . the stickers should run inthe direction of the air current. The boards shouldnot be placed so as to baffle the air currents. Other-wise the air will short circuit the piles and not passthrough them. For example, in a progressive kiln in which the airenters at one end and passes out at the other, so thatthe general movement of the air is in a somewhathorizontal path through the kiln lengthwise, flat piling,crosswise, is a satisfactory method, provided that theboards are spaced sufficiently far apart to allow the airto sink downward at the same time that it moves throughthe pile. This condition is diagrammatically illustratedin Figure 32, where the ends of the boards are visiblein the view, the stickers lying horizontally and length-wise of the kiln. Piling Methods Contrasted.—Where the air move-ment is in a general vertical direction, as is usually thecase in compartment kilns, with condensers or withventilators along the middle or the sides, flat piling 158 THE KILN DRYING OF LUMBER. THE CIRCULATION AND METHOD OF PILING 159 is not at all satisfactory, for the reason that the boardsbaffle the air currents. An actual test was made withtwo large kilns, in one of which the motion of the airwas lengthmse from end to end, and in the other it wascrosswise and vertical. Flat crosswise piling was usedin both cases; and although the measured circulationwas more than fifty times as great in the kiln with thevertical, transverse movement, the insides of the pilesdried no better in the kiln with the enormously in-
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Keywords: ., bookcentury1900, bookdecade1910, bookidkilndry, booksubjectlumber
