By W. J. Kape
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Additional info for An Introduction to the Seasoning of Timber
E. distillation. A special apparatus designed by Dean and Stark may be obtained from firms dealing with scientific instruments. The method is to place the wood, in chip form, into a weighed flask, and then to weigh both so that the weight of the wood may be determined. Water saturated xylol is then added to the flask, which is then heated. The liquid boils and passes off in vapour form, carrying with it water from the wood chips as steam. The moisture rises into a condenser, and the water drops into a graduated receiver, where the volume may be read off immediately.
Is known. T h e question of steam pressure from the boiler related to heat in the kiln is best answered by the kiln engineer specialist, but the student operator should understand the significance of various factors. In small kilns, steam of medium pressure, about 20-25 Ib/in^ is usual, with higher pressures of 35-50 lb/in2 for medium to large kilns. A low-pressure boiler is not really suitable for drying kilns, owing to the constant loss of steam blown out of the humidifica tion pipes, and the continuous demand for make-up water, which lowpressure boilers are not expected to require.
Proper care in the case of timber, improves the quality. Lack of care reduces the value, and this costs money. In case the student is puzzled by the reference early in this chapter to "rain" being a drying element, let us make the point clear. It is necessary for some degree of humidity to be present during drying. If heat and air circulation alone are present, the wood will suffer in consequence, because of stress set up in the outer zone or skin. Moisture is required to assist in reducing stress during drying.
An Introduction to the Seasoning of Timber by W. J. Kape