five years. Our coal pro- retain and secure the elevator at any point, as the duction, which was the main mining interest, was the level of a gallery, a simple hook, N, is slung by two result chiefly of foreign talent and labor, our own peo- The improvement il- lines, which keep it always in… … sel to be tilted or invert- ed. It is guided in its It can be easily seen that the devices for dumping ascent by the rails, B, from any gallery and for loading at any point, may and the lips, C. A por- be repeated indefinitely, so that the apparatus is tion of the front rail is adapted for mines…
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