144 



Canadian Forestry Journal, November-December, 1912. 



[CourU'tiii Ameyiran Forestry. 

 Wood Preservation Room, U.S. Forest Products Laboratory. 



Open-tank tieatiuoiit on left; commercial treating plant in centre. 



gaged in investigating such prob- 

 lems as the analysis and grading of 

 (•ommercial creosote, the analysis 

 and grading of wood turpentine, 

 an<] methods of analyzing treated 

 wood to determine the kind and 

 quantity of preservative in it. 



The section of engineering has to 

 do with the design of machines and 

 apparatus to be used in saving wood 

 waste, and so complete tlie woik ( f 

 other hal'oratories which have found 

 that certain wood waste is capable 

 of beiiic utilized. Tliis section takes 

 up sucli work as the design of an ex- 

 perimental grinder for the manufac- 

 ture of ground-w^ood pulp from 

 woods other than spruce; the de- 

 sign of a dry-kiln for experimental 

 purnoses; the desi<'-n of a hack for 

 shallow chippina- in turpentine ex- 

 periments and the j>"enaration of 

 standard desisrns for differonl types 

 of treating plants. 



Some Results. 



The work of the laboratory has 

 shown good results. In little more 

 than a year after its establishment 

 important discoveries had been 

 made. It was found, by the wood 

 pulp section that jack pine and hem- 

 lock were satisfactory for ground- 

 wood pulp, with the ordinary com- 

 mercial equipment, slight variations 

 in the process of manufacture only 

 being necessary. Jack pine, dead 

 or green tamarack and wood waste 

 have been found satisfactory for 

 chemical pidp, and good Kraft i>ap- 

 er has been made from the clear 

 waste of Western yellow pine and 

 l^outhern yellow pine. 



Western yellow pine has been 

 tried for the ]irocluction of various 

 resinous products, and 's found to 

 nvoduce more resin per year tlian 

 the F^outhern yellow pine. A .•^tiM 

 lias been devised for the minnfa''- 



