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Neuere Betriebsergebnisse ueber den Moll'schen Streckenausbau
Experience with Moll supports; difficulties experienced with roof of 3 1/4-3 3/4-ft seam; material is brittle slate clay, forming Trompeter zone 16 to 20 ft in height; satisfactory control of roof conditions effected by use of Moll system of curved steel supports; small saving in first cost and large saving in maintenance, compared with timber frames. (see also brief English abstract in Colliery Guardian v 10 n 110 Apr 1933 p 143)
Neuere Betriebsergebnisse ueber den Moll'schen Streckenausbau
Experience with Moll supports; difficulties experienced with roof of 3 1/4-3 3/4-ft seam; material is brittle slate clay, forming Trompeter zone 16 to 20 ft in height; satisfactory control of roof conditions effected by use of Moll system of curved steel supports; small saving in first cost and large saving in maintenance, compared with timber frames. (see also brief English abstract in Colliery Guardian v 10 n 110 Apr 1933 p 143)
Neuere Betriebsergebnisse ueber den Moll'schen Streckenausbau
Neuere Betriebsergebnisse ueber den Moll'schen Streckenausbau
Pfeifer, F. (author)
Bergbau ; 46
1933
5 pages
Article (Journal)
German
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