. The Forest products laboratory : a decennial record, 1910-1920. e and laminated Mood studies, thesection of preservation is also suitably equipped with glue mixing andspreading machines, hot and cold presses, strength test machines, anaircraft propeller manufacturing plant and a series of conditioningrooms where temperature and humidity are under control. The first efforts at wood testing in this country were strengthtests on timbers of several species of American woods. In this senseone may say that the study of timber mechanics of wood was the lead-ing field of research. Today the equipmen
. The Forest products laboratory : a decennial record, 1910-1920. e and laminated Mood studies, thesection of preservation is also suitably equipped with glue mixing andspreading machines, hot and cold presses, strength test machines, anaircraft propeller manufacturing plant and a series of conditioningrooms where temperature and humidity are under control. The first efforts at wood testing in this country were strengthtests on timbers of several species of American woods. In this senseone may say that the study of timber mechanics of wood was the lead-ing field of research. Today the equipment of this important partof the laboratory is especially complete, and most of the equipmentwas designed by the laboratory engineers. A timber thirty feet in length is readily accommodated in thecapacious jaws of the new million-pound testing machine recentlyerected as part of the equipment of the timber mechanics same giant of wood breakers will test the strength of horizontal,])uilt-up beams, trusses and girders with a length as great as eighty. ERECTION OF THE MILLION POUND TOIBEll TESTING MACHINE (1020) 18 The Forest Products Laboratory feet. While this indicates the niuxiiniini caj^acity of the Forest Prod-ucts Laboratory to test timbers and huge built-up members, the equip-ment for lesser parts is especially complete. Ten machines capableof applying breaking strains of from 10,000 to 200,000 pounds arealso available. Toughness and impact resistance are measured onother machines, while many special tools and rigs are here for specialtests, including those for testing plywoods. Most of these machinesare original devices that first saw the light of day in the la])oratoryas need for them arose in the progress of the development of thetechnique of testing wood. The box laboratory, a part of the work of timber mechanics, isequipped with two tumbling drums, the larger of which can take boxesMeighing as much as half a ton, and reduce them slowly or quickly toa shat
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