UNSCIENTIFIC AND SCIENTIFIC DIVINING RODS. Fig. 2ROD FOR IRON AND PRECIOUS METALS. Fig. 3GOLD FINDER. Fig. 4MINER'S COMPASS. Fig. 7INSTRUMENT FOR DETECTING THE PRESENCE OF METALS UNDER WATER., scientific american, 1892-08-20
UNSCIENTIFIC AND SCIENTIFIC DIVINING RODS. Fig. 2ROD FOR IRON AND PRECIOUS METALS. Fig. 3GOLD FINDER. Fig. 4MINER'S COMPASS. Fig. 7INSTRUMENT FOR DETECTING THE PRESENCE OF METALS UNDER WATER., scientific american, 1892-08-20
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