An Elementary Course of Instruction for Mine Foremen And Pit Bosses
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In our eReader you can find the full English version of the book. Read An Elementary Course of Instruction for Mine Foremen And Pit Bosses Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Elementary Course of Instruction for Mine Foremen And Pit Bosses
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To quickly assess the difficulty of the text, read a short excerpt:
These braces either rest in notches cut in the studs or upon short props 72 placed on the sides for that purpose, while between the upper ends of the braces a short horizontal bar is used resting- against the under side of the cap as a means of central support.
Q. 200. In what way should the roof of the underground work- ing's be supported, and what may be said about timber-drawing in a mine?
A. The enormous weight of overlying strata in coal mines requires an efficient system of timbering and ...packing that will pro- vide safety for the miners; yet, as timbering is expensive, prudence demands that it shall de done economically, and there should be as little waste as possible. Knowledge of the condition of a roof can only be gained through experience, and this enables the miner to determine where props are required in his room, and freedom from accidents depends largely upon the intelligence and judgment of the workmen. Props should always be placed in line with the direction of the pressure, so as to secure the maximum resistance, and knowledge of where and how far apart supports should be placed can only come from study, careful observation and years of experi- ence.
What to read after An Elementary Course of Instruction for Mine Foremen And Pit Bosses?
You can find similar books in the "Read Also" column, or choose other free books by Floyd Davis to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
These braces either rest in notches cut in the studs or upon short props 72 placed on the sides for that purpose, while between the upper ends of the braces a short horizontal bar is used resting- against the under side of the cap as a means of central support.
Q. 200. In what way should the roof of the underground work- ing's be supported, and what may be said about timber-drawing in a mine?
A. The enormous weight of overlying strata in coal mines requires an efficient system of timbering and ...packing that will pro- vide safety for the miners; yet, as timbering is expensive, prudence demands that it shall de done economically, and there should be as little waste as possible. Knowledge of the condition of a roof can only be gained through experience, and this enables the miner to determine where props are required in his room, and freedom from accidents depends largely upon the intelligence and judgment of the workmen. Props should always be placed in line with the direction of the pressure, so as to secure the maximum resistance, and knowledge of where and how far apart supports should be placed can only come from study, careful observation and years of experi- ence.
What to read after An Elementary Course of Instruction for Mine Foremen And Pit Bosses?
You can find similar books in the "Read Also" column, or choose other free books by Floyd Davis to read onlineMoreLess
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