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American travel diary of an unknown Englishman, 1864
095_Journal Page 95
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being given. The stamp machinery is very interesting, the ore is brought down from the mine shaft up the hill to the Stamps, there crushed by kind of iron monkeys & then various machines are used to separate the copper from the stone, one of the most curious is the percussion principle the powder after passing through a grating from the crushers runs over a platform AB this platform has a motion from B to A & A to B. (Sketch at left) the copper on account of its inertia being greater than that of the stone works upwards up the inclined plane & collects at A. Another principle is the [J?] jigger which
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being given. The stamp machinery is very interesting, the ore is brought down from the mine shaft up the hill to the Stamps, there crushed by kind of iron monkeys & then various machines are used to separate the copper from the stone, one of the most curious is the percussion principle the powder after passing through a grating from the crushers runs over a platform AB this platform has a motion from B to A & A to B. (Sketch at left) the copper on account of its inertia being greater than that of the stone works upwards up the inclined plane & collects at A. Another principle is the [J?] jigger which
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