The elasticity and resistance of the materials of engineering . The theory of the flow of solidsto be given is that developed byMons. H. Tresca in his Memoiresur rEcoulement des Corps So-lides, 1865. He made a largenumber of experiments on hardand soft metals, ceramic pastes,sand and shot. These different materials allmanifested the same characteristicsof flow, which are well shown inFig. 2. ABCDy Fig. i, is supposedto be a cylindrical mass of leadwith circular horizontal section, con-fined in a circular cylinder, MNyclosed at one end with the excep-tion of the orifice O. This cylinder


The elasticity and resistance of the materials of engineering . The theory of the flow of solidsto be given is that developed byMons. H. Tresca in his Memoiresur rEcoulement des Corps So-lides, 1865. He made a largenumber of experiments on hardand soft metals, ceramic pastes,sand and shot. These different materials allmanifested the same characteristicsof flow, which are well shown inFig. 2. ABCDy Fig. i, is supposedto be a cylindrical mass of leadwith circular horizontal section, con-fined in a circular cylinder, MNyclosed at one end with the excep-tion of the orifice O. This cylinder is supported onthe base PNy while the face AB ofB the lead receives external pressurefrom a close-fitting piston. Whenthe pressure is sufficiently increased,the face AB in Fig. i sinks to AB in Fig. 2, while the column hkHK,in the latter figure, is forced to flowthrough the orifice O. In Trescas experiments with°D lead, the diameter AB was inches ; the diameter///^of theorifice, from in. to ins., while the length of the columnor jet /^iT varied fr


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