contact 700 tines a minute. and depth of a mineral deposit, but also, to a great ten driving wheels, all coupled, are 4 feet 6 inches in By adjusting his earth connections the operator can diameter, and the rigid wheel-base, which is equally extent, its nature and characteristics. focus the waves… … More delicate instruments months to have located, traced, than the old galvanometer have ORE PROSPECTING BY MEANS OF ELECTRICITY. and mapped out metalliferous been employed in the measure- deposits of various natures which were quite invisible ment of earth resistance, and mining engineers and…
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