By W. J. Kape

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P L E N U M CHAMBERS Air velocity apart, the fact of air circulation is to serve several pur­ poses : (a) it carries heat to the wood; (b) it carries off moisture from the wood; (c) it allows moisture in the form of vapour to escape from the vents; and (d) it must be recirculated continuously. If the fans are situated to one side of the kiln, which is usual, then air will obviously enter one side of the stack and in a semi-saturated state emerge from the other. This means, of course, that one side of the stack would dry more quickly than the opposite side.

J . ( 1 9 5 0 ) . How Wood Dries. U . S . D e p t . Agr. 1642. B R O W N , W . H . ( 1 9 5 8 ) . Structure of W o o d and its Relation to D r y i n g . Timber Technology, 139. JANE, F . W . ( 1 9 5 6 ) . The Structure of Wood. Black, L o n d o n . 30 3 DRYNESS AND MOISTURE CONTENT O N E of the major factors, where trouble occurs in manufacture or in handling wood, is incorrect moisture content. Unless wood is seasoned to the proper moisture content, and stored under proper conditions, there are sure to be difficulties.

The Structure of Wood. Black, L o n d o n . 30 3 DRYNESS AND MOISTURE CONTENT O N E of the major factors, where trouble occurs in manufacture or in handling wood, is incorrect moisture content. Unless wood is seasoned to the proper moisture content, and stored under proper conditions, there are sure to be difficulties. If it is too dry, it will absorb more moisture and will swell, and if it is not dry enough, it will tend to split, distort and shrink. There is a recognized method by which moisture content is expressed as a percentage of the oven dry weight of wood.

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