The technical educator, an encyclopædia

The technical educator, an encyclopædia

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A tramway laid along the gallery would connect the productive part of the mine with the outside world. ... operation, and before commencing it has to be well considered where to place it A Jeep shaft, including engine-power, has teen known to cost ilOO.OOO ... of the coal to the pita#39;s mouth ; though, if the workings became very extensive, a second shaft would have to be sunk. ... can then como up out of the way of danger, and all the charges be fired simultaneously by an electric battery.

Title:The technical educator, an encyclopædia
Author:Technical educator
Publisher: - 1880


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