. Hardware merchandising January-June 1898 . ng its elastic limit raised very consider-ably by the hardening process. For prac-tical purposes it may be said, in fact, thatthe elastic limit is raised up to the breakingpoint of the hard steel, and this point isunaltered by the hardening treatment. Thisis further confirmed by tests made on harddrawn piano wire, where the results obtain-ed ran up to 270,000 pounds per squareinch for the elastic limit, and from 290 to335,000 for the ultimate strength. Thebanner test was that of a wire broken at theWatertown Arsenal, which gave way at460,000 pounds
. Hardware merchandising January-June 1898 . ng its elastic limit raised very consider-ably by the hardening process. For prac-tical purposes it may be said, in fact, thatthe elastic limit is raised up to the breakingpoint of the hard steel, and this point isunaltered by the hardening treatment. Thisis further confirmed by tests made on harddrawn piano wire, where the results obtain-ed ran up to 270,000 pounds per squareinch for the elastic limit, and from 290 to335,000 for the ultimate strength. Thebanner test was that of a wire broken at theWatertown Arsenal, which gave way at460,000 pounds per square inch. Baus-chinger has proven that the elastic range ofa metal, and the safe working stress areintimately connected, and Dr. Poles obser-vation that the elastic range is increased byhardening as well as the elastic limit istherefore of great value. The whole processof tempering springs derives its advantagesfrom this fact. The only use for hardenedsteel so far in the arts has been for hard-drawn steel wires for cables on Dunlop Staff—F. H. Tippet, St. John, , Depot. / / HARDWARE AND METAL / 33
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