. Department bulletin. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. Washington, D. C. May 12, 1923 By Rolf Thelen, In Charge, Section of Timber Physics, Forest Products Labo- ratory, Forest Service. CONTENTS. Page. Purpose 1 Moisture in wood 1 General principles of drying wood 5 Heat in the kiln 6 Humidity in the kiln 14 Air circulation in the kiln 20 Page. Drying and drying stresses 23 Drying schedules 31 Kiln types 45 Piling lumber for kiln drying 53 Details of kiln operation 56 Air seasoning 63 The principal purpose of this bulletin is to present to the dry-kiln operat
. Department bulletin. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. Washington, D. C. May 12, 1923 By Rolf Thelen, In Charge, Section of Timber Physics, Forest Products Labo- ratory, Forest Service. CONTENTS. Page. Purpose 1 Moisture in wood 1 General principles of drying wood 5 Heat in the kiln 6 Humidity in the kiln 14 Air circulation in the kiln 20 Page. Drying and drying stresses 23 Drying schedules 31 Kiln types 45 Piling lumber for kiln drying 53 Details of kiln operation 56 Air seasoning 63 The principal purpose of this bulletin is to present to the dry-kiln operator, in condensed and convenient form, the fundamental facts about the drying of wood which he must know in order to get the most satisfactory results with his kiln. The major portion of the bulletin deals with the kiln drying of lumber, but there are also in- cluded specific suggestions concerning the drying of other forms of wood. The general information is applicable to all kinds of drying. * No attempt has been made to present detailed data in substantia- tion of the information given. The conclusions are for the most part based on extensive investigations and experiments by the For- est Products Laboratory of the Forest Service, Department of Agri- culture, Madison, Wis., tested out in commercial practice. MOISTURE IN WOOD. The purpose of drying or seasoning wood is to remove a certain amount of the moisture which is naturally present in it, and which if allowed to remain would interfere with its use for most construc- tion purposes. The exact amount of moisture to be removed de- Note.—Acknowledgement is made by the author to the members of the Section of Timber Physics, both past axid present, who are largely responsible for the development of the practical technique of kiln drying described in this bulletin. 23241°—23 1 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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