A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Control of roof and prevention of accidents from falls of rock and coal
Since 1906, about 30,000 men have been killed by falls of rock and coal in bituminous coal mines, and more than 7000 in Pennsylvania anthracite mines; little improvement made during 40 yr; in majority of cases where roof has collapsed with injury to one or more persons, it was because pillars were unduly weakened or artificial support was inadequate.
Control of roof and prevention of accidents from falls of rock and coal
Since 1906, about 30,000 men have been killed by falls of rock and coal in bituminous coal mines, and more than 7000 in Pennsylvania anthracite mines; little improvement made during 40 yr; in majority of cases where roof has collapsed with injury to one or more persons, it was because pillars were unduly weakened or artificial support was inadequate.
Control of roof and prevention of accidents from falls of rock and coal
U S Bur Mines -- Information Cir
Forbes, J.J. (author) / Sloman, H.J. (author)
1948
8 pages
Report
English
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Control of roof and prevention of accidents from falls of rock and coal
| Engineering Index Backfile | 1948
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| Engineering Index Backfile | 1930
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| Engineering Index Backfile | 1930
Reducing accidents from falls of roof in coal mines
| Engineering Index Backfile | 1930
Reducing accidents from falls of roof in coal mines
| Engineering Index Backfile | 1930