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Scientific American, Vol. 36, No. 9 (March 1877) (1877)

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An illustration from Scientific American, Vol. 36, No. 9 (March 1877), 1877, leaf 0
drawing. This, with the pointing and cleansing left to be finished in the cold plate by the wire drawer him- processes already described, are illustrated in the large engrav- tive progress at the factory of Mr. J. Lloyd Haigh, in South self. For extremely fine wire, the drawplates are sometimes… … ty which protrudes consists in dipping MAKING THE WIBE FOR THE EAST RIVER BRIDQE-Fig. 1. through, watching the coils in vats con- his chance to do so taining dilute sul- as the cam on turning allows the nippers t» be moved to the phuric acid until the surface is sufficiently attacked. Then steel,…

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