Standard test specimens of zinc bronze (Cu88, Sn10, Zn2)--Parts I and II . Fig. 4.—Fractured test bars Standard Zinc-Bronze Test Bars 27 per square inch. Although not poured at the same time from thesame heat, the comparison is a fair one, because both were pouredat the same temperature. It is probable that where every othercondition is the same the cylindrical shape will yield a specimenfrom which might be expected a higher relative elongation inproportion to its tensile strength than could be obtained from thecast-to-size shape. In the three shapes representing the sixth series the barrel-sh
Standard test specimens of zinc bronze (Cu88, Sn10, Zn2)--Parts I and II . Fig. 4.—Fractured test bars Standard Zinc-Bronze Test Bars 27 per square inch. Although not poured at the same time from thesame heat, the comparison is a fair one, because both were pouredat the same temperature. It is probable that where every othercondition is the same the cylindrical shape will yield a specimenfrom which might be expected a higher relative elongation inproportion to its tensile strength than could be obtained from thecast-to-size shape. In the three shapes representing the sixth series the barrel-shape specimen shows its superiority in elongation and reductionof area to either of the other shapes, but, as might be expected,was inferior in tensile strength. In the sand-cast specimens representing the seventh series thesame relative high percentage of elongation in proportion to ten-sile strength is shown by the cylindrial specimen. The eighth series consists entirely of specimens which have beensubmitted to heat treatment. (See Sec. VIII.) The two specimens from
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