Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers
Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers
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In our eReader you can find the full English version of the book. Read Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers 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 Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers
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To quickly assess the difficulty of the text, read a short excerpt:
Davey differential Underground 36 4, 300 41, 360, 000 c. Davey differential- compound Surface /33-in. H. P. C. ) 1 52 L. P. C. / / 9, 1 112, / 200 69, 705, 890 d. Duplex differential Underground 22 2 ;, 300 41, 360, 000 e. Compound Bull , /28 H. P. C. 1 \ 48 . , L. P. C. / 12 168 35, 827, 200 /. , Davey differential /34 H. P. C. I 164 L. P. C. / 7 2J in.
100, 800, 000 a, b and d, Leven Colliery ; c and/, Davey's ; e, Wellsgreeu.
Mr Henry Davey states that the greatest efficiency of double- acti...ng rotative pumping engines does not exceed 30 to 40 million foot-lbs. Per cwt. Of coal burned.
Arrangement of Pumps. As already stated, it is usual to make the bottom lift in the shaft a bucket pump, and the other lifts forcing or plunger sets, which arrangement is found to work satis- factorily in most cases.
Many, however, prefer to have all the lifts as forcing sets, especially if there is no likelihood of the lower lift being flooded by a sudden inflow. Where pumps are operated with rods in the shaft, it is almost an invariable custom at coal mines to work the rods with a pair of bell-cranks, unless they are worked by a direct acting engine, such as a Bull engine.
What to read after Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers?
You can find similar books in the "Read Also" column, or choose other free books by George L Kerr to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Davey differential Underground 36 4, 300 41, 360, 000 c. Davey differential- compound Surface /33-in. H. P. C. ) 1 52 L. P. C. / / 9, 1 112, / 200 69, 705, 890 d. Duplex differential Underground 22 2 ;, 300 41, 360, 000 e. Compound Bull , /28 H. P. C. 1 \ 48 . , L. P. C. / 12 168 35, 827, 200 /. , Davey differential /34 H. P. C. I 164 L. P. C. / 7 2J in.
100, 800, 000 a, b and d, Leven Colliery ; c and/, Davey's ; e, Wellsgreeu.
Mr Henry Davey states that the greatest efficiency of double- acti...ng rotative pumping engines does not exceed 30 to 40 million foot-lbs. Per cwt. Of coal burned.
Arrangement of Pumps. As already stated, it is usual to make the bottom lift in the shaft a bucket pump, and the other lifts forcing or plunger sets, which arrangement is found to work satis- factorily in most cases.
Many, however, prefer to have all the lifts as forcing sets, especially if there is no likelihood of the lower lift being flooded by a sudden inflow. Where pumps are operated with rods in the shaft, it is almost an invariable custom at coal mines to work the rods with a pair of bell-cranks, unless they are worked by a direct acting engine, such as a Bull engine.
What to read after Practical Coal Mining a Manual for Managers Under Managers Colliery Engineers?
You can find similar books in the "Read Also" column, or choose other free books by George L Kerr to read onlineMoreLess
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