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Ch. 12: Winning the Diamonds

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10 THE DIAMOND MINES OF SOUTH AFRICA
have become mixed with the blue ground during the process of mining, are picked out to be thrown away. Then the well-
disintegrated blue ground is taken from the floors in trucks by endless rope haulages to the washing machines and put through the first stage of concentration.
The ground is dumped from the trucks into hoppers, at the bottom of which are small revolving tables upon which the ground is divided and fed automatically into two revolving cylinders. This automatic feeder, which was devised by Mr. Robeson, late mechanical engineer to De Beers Company, not
only divides the ground equally between two rotating washing machines, but delivers it regularly, so that the machines can­not become overcharged, which would result in loss of diamonds.
Ch. 12: Winning the Diamonds Page of 396 Ch. 12: Winning the Diamonds
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