COAL HEADING MACHINE.
There has been fitted up in the Gateside coal pit at Sanquhar a Jeffery electric coal heading machine, the first of its kind, it is understood, to be used in any Scottish pit. From a dynamo at the pithead an insulated copper wire is carried through the pit being hung from the roof or sides or coiled on drums for convenience of shifting or extending. This is attached to a motor placed on a telescopic framework of angle iron, round which there runs an endless chain, fitted with a series of knives, each projecting an inch and a-half, and three-quarters of an inch broad. These knives are set at different angles, so as to make a cut 4|in deep. These knives are driven into the seam for a distance of 6tt, making a cutting 44ft in width, then the machinery automatically reverses and returns. It is then shifted sideways, and another cut made alongside the first; and this is repeated until the full breadth of the working has been undercut, and so prepared for bringing down the mass of coal by blasting. Each cut occupies about four minutes, and the machine is attended by three men.
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Greymouth Evening Star, Volume XXXI, 4 November 1901, Page 4
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199COAL HEADING MACHINE. Greymouth Evening Star, Volume XXXI, 4 November 1901, Page 4
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