Abstract
MR. J. E. DEERING contributes a useful article on the origin of defects in copper conductors to the Electrical Review of October 3. When hard drawing became a common practice, copper wire became a practical substitute for galvanized iron wire for overhead telegraph and telephone lines. The effect of the process was to raise the tensile strength of copper from 6·5 tons to 20 tons per square inch, which is almost equal to that of wrought iron, whilst its resistance is only about one-sixth. The effect of the cold drawing of copper is to make its resistivity only about 3 per cent higher than that of standard annealed copper.
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Origin of Defects in Copper Conductors. Nature 144, 950 (1939). https://doi.org/10.1038/144950a0
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DOI: https://doi.org/10.1038/144950a0