Abstract
SUMMARY A number of experiments were carried out on the exchange of moisture between discs of 1/8th inch and 1/16th inch Birch veneer below the fibre saturation point. It appears from these experiments that the rate of moisture movement in wood below the fibre saturation point is dependent, not only upon the moisture gradient, but also upon the moisture content. But for this limitation, fair agreement was obtained with the law of diffusion. The values obtained for the coefficient of conductivity have no definite significance as they represent mean values over a period. The rate of moisture exchange between the discs was found to be approximately proportional to the square of their combined thickness and was within 15 per cent, of the demands of the law of diffusion for these particular experiments. From the few experiments carried out at a higher temperature it would appear probable that the change in the rate of moisture movement with rise in temperature is proportional to the change in the vapour pressure of water.
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