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Scientific American, Vol. 84, No. 23 (June 1901) (1901)

leaf 3

An illustration from Scientific American, Vol. 84, No. 23 (June 1901), 1901, leaf 3
increase of production employed in making explorations, and power rock during practically every year since the inauguration prices and market conditions of late years may be drills are in almost universal use in mining oper- largely attributed to the growing foreign demand. ations proper. Instead… … United States was estimated at cast in the form oi "anodes"—slabs COFFER, BEADY FOR SHIFMEUT, LAKE SUFERIOR DISIBIOT. one hundred tons, of which Mich- about three feet in length,' with a hoisting buckets of rock by means of a windlass, as in hook at one end which facilitates the suspension of igan…

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