Report upon the forestry investigations of the of agriculture1877-1898 . ith thatfinesse which would be required for a scientific demonstration of a natural law, that other influences, as crossgrain,unknown defects, and moisture conditions may cloud the results, and that in the averaging of results undue consid-eration may have been given to weaker or stronger, heavier or lighter, material, the relaxation is exhibited even bythis wholesale method with a remarltable degree of uniformity bordering on demonstration. An exception is apparent in the oaks in that they do not exhibit th
Report upon the forestry investigations of the of agriculture1877-1898 . ith thatfinesse which would be required for a scientific demonstration of a natural law, that other influences, as crossgrain,unknown defects, and moisture conditions may cloud the results, and that in the averaging of results undue consid-eration may have been given to weaker or stronger, heavier or lighter, material, the relaxation is exhibited even bythis wholesale method with a remarltable degree of uniformity bordering on demonstration. An exception is apparent in the oaks in that they do not exhibit this relation of weight and strength withreference to other species, and also with less definiteness among the various sjiecies of oak in themselves. Thestructure of oak wood being exceedingly complicated and essentially different from that of tlio wood of all otherspecies under consideration, it may reasonably be expected that it will not range itself with these. TIMBER PHYSICS STRENGTH AND WEIGHT. 367 Mesults of tests in lending^ at relative elastic limit.[Pounds per square iucli.]. JS 40 4S Weight ijer cubic foot in pounds. Fig. 95.—Eelation of strength in compression endwise to Tveight of materia!. The lig thereby represented. SO S5 oo at each point indicates the species 368 FORESTRY INVESTIGATIONS U. S. DEPARTMEKT OF AC4RICULTURE. moo\ moo /7000 moo /£P00 7 uooo /3000 /2000 I //ooo /oooo 9000 8000 7000 6^000
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
