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Scientific American, Vol. 87, No. 19 (1902) (1902)

leaf 9

An illustration from Scientific American, Vol. 87, No. 19 (1902), 1902, leaf 9
he the reduced size enabling the parts to be fitted more superficial acres of gold-bearing ground a year. ladder consists of a heavy lattice girder with %4-inch perfectly, permitting the diminution of friction and The monthly profit of the larger dredgers, though side plates 3 feet deep. The bucket… … volving screen ticulars an@d is 4% feet in details concern- diameter and ing pumps, condenser, etc., may be obtained from $12,000. Values from the borings referred to are some- 25 feet long, perforated with %-inch holes. The water the Patent Office at Washington by ordering a copy times less than…

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