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Scientific American, Vol. 57, No. 22 (November 1887) (1887)

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An illustration from Scientific American, Vol. 57, No. 22 (November 1887), 1887, leaf 0
arrel and haps one of those simple operations tank hoops, it finds its legitimate ap- which would hardly be considered a plication. It also finds an extensive subject for improvement; but the in- application in shops, for lengthening vention of Professor Thomson not screw taps, drills, reamers,… … Fig. l.-ELECTRIC WELDDTG AT THE AMERICAN INSTITUTE FAIR, NEW YORK.-PROFESSOR ELIHXJ THOMSON'S PROCESS. © 1887 SCIENTIFIC AMERICAN, INC.

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