A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Some information on timbering bituminous-coal mines
Falls of roof and coal caused 53.1% of all fatalities in bituminous coal mines (in United States) from 1929 to 1938 inclusive; in anthracite mines, 54.7% for same period; questions and answers are supplemented with sketches of mine timbers for support of immediate roof at working places; causes of falls; timbering and roof support in mechanical mining. (10¢)
Some information on timbering bituminous-coal mines
Falls of roof and coal caused 53.1% of all fatalities in bituminous coal mines (in United States) from 1929 to 1938 inclusive; in anthracite mines, 54.7% for same period; questions and answers are supplemented with sketches of mine timbers for support of immediate roof at working places; causes of falls; timbering and roof support in mechanical mining. (10¢)
Some information on timbering bituminous-coal mines
U S Bur Mines -- Miners' Cir
Forbes, J.J. (author) / Owings, C.W. (author)
1939
37 pages
Report
English
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Questions and answers on timbering bituminous coal mines
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