American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 624
WIRE DRAWING. the latter to the drum r. r is revolved by machinery not shown in the figure. Thedrawing is repeated until the wire is reduced to the desired size, a smaller die beingused at each drawing. During the drawing process the wire becomes hardened and,consequently, it is necessary to anneal…
Telegraph
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