American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 630
aried by bending the wire back and forth upon itself.For copper this test is jjerhaps more valuable than the twist test, since it shows howmany bends and kinks it is likely to withstand without breaking. For making thelatter test a device somewhat resembling a lemon squeezer, without the… … DUCTILITY TEST. Wire Testing For Resistance and Conductivity. In the natural state, iron and copper are found, mixed more or less, with oxidescarbon,arsenicjphosphorous, etc., to remove which impurities is the object of the variousrefining, smelting and hammering processes to which the metals are…
Telegraph
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