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Reel When two vert shafts with connecting workings are available , only a single wire in each shaft is needed , preferably hung near the center . Having determined the coordinates of the two wires by a closed surface traverse , set up ...
It is screwed to a board having a 1 1 / 2 - in hole , set in the shaft timbers . The mean position of the wire is calculated by observations on the two scales . The bob is then disconnected , and the wire threaded through a fine hole in ...
In metal mines , candles or other combustibles should not be stored on shaft landings , but in metal containers at a distance . Underground pump , engine , and transformer rooms , in all mines , should be arched , and floored with non ...
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LibraryThing ReviewUlasan Pengguna - wackyvorlon - LibraryThing
I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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