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3. Strength of Wood with Relation to its Moisture 



Contents. 



To determine the relation of moisture content of wood to its strength 

 for every wood species one or two beams of every size and species were 

 tested after drying in a kiln. 



4. Strength of Wood in Relation to Steam Treatment. 



To determine the relation of steam treatment to the strength of 

 wood, one or two beams of every size and species to be tested were 

 steamed and tested after drying. 



II. Machine used for the Testing 



Buckton's 50 ton testing machine belong to the laboratory of the 

 Engineering College of the Tokyo Imperial University was used. Since 

 the machine is intended for use chiefly in testing the strength of iron, 

 the span is limited to 5 ft. but for our purpose special fitting were made 

 so as to make possible a span of 98 inches. 



III. Wood Tested 



The principal species used for building purpose such as Sugi 

 (Cryptomeria japonica), Hinoki (Chamaecyparis obtusa), Akamatsu (Pinus 

 densiflora) and Asunaro (Thujopsis dolabrata) were duly tested. Sugi 

 was obtained from Yoshino, Owashi and Kiyosumi; Hinoki from Kiso, 

 Yoshino and Owashi; Akamatsu from Mito, and Asunaro from Aomori. 



The beams tested were 9 ft. long, their cross-sections were either 

 square or rectangular, being 7 in. breadth with thicknesses of 2, 3, 4, 5, 

 6, and 7 inches respectively. These beams classified according to the 

 locality of production and forest features are as follows: — 



