A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
Factors governing falls of roof and need for regulations; mining conditions in districts studied; timbering regulations; draw slate immediately over coal is principal member of roof requiring special consideration; importance of supporting it temporarily; strict observance of regulation should reduce or prevent accidents from falls of roof material.
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
Factors governing falls of roof and need for regulations; mining conditions in districts studied; timbering regulations; draw slate immediately over coal is principal member of roof requiring special consideration; importance of supporting it temporarily; strict observance of regulation should reduce or prevent accidents from falls of roof material.
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
U. S. Bur. Mines -- Tech. Paper
Paul, J.W. (author) / Calverley, J.G. (author) / Sibray, D.L. (author)
1930
41 pages
19 Figs.
Report
English
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