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Scientific American, Vol. 69, No. 8 (1893) (1893)

leaf 3

An illustration from Scientific American, Vol. 69, No. 8 (1893), 1893, leaf 3
y turned on its back with each re- region bore everywhere strong evidences of weather- verse motion of the device on the strop. The strokes ing, by means of which the mound had been weathered may be short or long, quick or slow, but it is quite im- out into relief. He had removed some twenty tons… … passes through a metal eye, the body of which is car- nearer the edge atone extremity than at the ried through to the bottom of the base, on the under other. He places the three cards upon a surface of which are oppositely disposed conducting Measuring 4 to 5 feet in length, and entirely perfect,…

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