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Collection: Directories and Documents

A Descriptive Treatise on Mining Machinery, Tools, and Other Appliances Used in Mining - Volume 1 (1877) (311 pages)

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20 MINING MACHINERY. 4 tons of coal brought down in twenty-five minutes. A workman in charge of the place was asked how long it would have taken him to have drilled the hole and fired the shot, according to the present system of blasting, and he considered that an hour would be required for the purpose, and a pound of gunpowder used, at a cost of 5d. The superiority of the machine was, therefore, evidenced by the saving of thirty-five minutes in time, and 5d., the cost of powder, and the work was done without the smallest danger to anyone. Two further trials of the machine were made in other parts of the workings, in both the Seven and Eightfeet seams, with results equally satisfactory. The mode of using the machine in the working of coal would be to provide each set of colliers with a pair of steel tension straps, and the machine could easily be carried about by a man like a double-barrelled gun under his arm, from place to place. It would thus be necessary to have only one press for a large number of these places: the entire cost of the machinery is very small.