Bulletin of the of Agriculture . Post Oak, A White Oak (Radial Section, Magnified 50 Diameters). SP, springwood; SW, summerwood; MR, medullary ray; V, pores or vessels; X, wood pros-enchyrna (fibers, etc.); T, tyloses. RESISTANCE OF HARDWOODS TO Fig. 1.—Apparatus for making penetrance tests. 6 BULLETIN 606, U. S. DEPARTMENT OP AGRICULTURE. mirror D, placed at the back of the oven, it was possible to observeboth ends of the specimen during the test. The impregnation tests were made in a cylinder L| feet in diameterand 4 feet long. Temperature and pressure were controlle
Bulletin of the of Agriculture . Post Oak, A White Oak (Radial Section, Magnified 50 Diameters). SP, springwood; SW, summerwood; MR, medullary ray; V, pores or vessels; X, wood pros-enchyrna (fibers, etc.); T, tyloses. RESISTANCE OF HARDWOODS TO Fig. 1.—Apparatus for making penetrance tests. 6 BULLETIN 606, U. S. DEPARTMENT OP AGRICULTURE. mirror D, placed at the back of the oven, it was possible to observeboth ends of the specimen during the test. The impregnation tests were made in a cylinder L| feet in diameterand 4 feet long. Temperature and pressure were controlled by meansof steam coils and a pressure pump. The specimens were separatedfrom each other during treatment, so that all parts of the wood werein contact with the preservative. MATERIALS USED. CREOSOTE. The creosote used was a coal-tar product with a specific gravity at 140° F. (60° C.) and a viscosity, determined by the Englerviscosimeter, of at 160° F. (71° C). The distillation1 was asfollows: Temperature. Distil-lation. ° Per 22. 205-235 235-245 245-275 275-305 305-360 Residue Loss Total The creosote was obtained by distilling a by-product coke oventar (Semet Solvay) to a very hard pitch. The i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
