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Electric mine hoists
1910
Proceedings of the American Institute of Electrical Engineers
Of primary importance in mine installations is the hoist, which has a very direct bearing on the successful operation of a mine. Conditions vary greatly with different mines, and especially in different localities. Such factors as depth, incline, the number of levels, permissible or desirable speeds, conditions of ore, etc., are always more or less special in each case. Veins of ore are never exactly duplicated, and the nature of the ground through which shafts are sunk may considerably modify
doi:10.1109/paiee.1910.6660524
fatcat:i2jnlrsrzzgmjl3n6lpgsqz7qm