Synopsis of a Report On Mining in California And Nevada Usa
Synopsis of a Report On Mining in California And Nevada Usa
G Thureau
The book Synopsis of a Report On Mining in California And Nevada Usa was written by author G Thureau Here you can read free online of Synopsis of a Report On Mining in California And Nevada Usa book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Synopsis of a Report On Mining in California And Nevada Usa a good or bad book?
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Is deducted for the distance between the engine, sheaves, and mouth of shaft, leaves 43 cwt. In the shaft ; this weight changes continually, so that when the bottom cage reaches the surface the weight of rope will be reversed. During the first part of the winding the power much exceeds that required half-way up, and at the latter end the engines have actually to be "braked" in order to meet the increasing and more than counterbalancing weight of the descending- cage and longer rope together. Wh...at strikes one as most unusual, was the extreme care which the mine superintendents generally bestowed on these wire ropes, and the observation of these officials, that " they (the ropes) formed the only link by means of which many valuable lives could hope to see daylight ^again" appears very appropriate under the circumstances. All these ropes are stored in a drying shed, after each rope had run "four months" over the sheaves ; they are then taken off, cleaned, and carefully repaired wherever necessary, and finally they are given a good coat of coal tar mixed with asphaltum warmed to liquidity.
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