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Experiments with reinforced concrete props at coal face
Seam was 3 ft 6 in. thick at depth of 500 yd and props were set on double unit strike face 285 yd long with dip of 1 in 7; it was demonstrated that reinforced concrete props set with release devices can be used over and over again on working faces under normal roof conditions. (See also - n 195 May 1940 p 129-30; Colliery Guardian v 160 n 4137 Apr 12 1940 p 534-6 and v 161 n 4154 Aug 9 p 152 and 154; Iron and Coal Trades Rev v 140 n 3763 Apr 12 1940 p 578 and n 3779 Aug 2 p 117-8)
Experiments with reinforced concrete props at coal face
Seam was 3 ft 6 in. thick at depth of 500 yd and props were set on double unit strike face 285 yd long with dip of 1 in 7; it was demonstrated that reinforced concrete props set with release devices can be used over and over again on working faces under normal roof conditions. (See also - n 195 May 1940 p 129-30; Colliery Guardian v 160 n 4137 Apr 12 1940 p 534-6 and v 161 n 4154 Aug 9 p 152 and 154; Iron and Coal Trades Rev v 140 n 3763 Apr 12 1940 p 578 and n 3779 Aug 2 p 117-8)
Experiments with reinforced concrete props at coal face
Colliery Eng
Coultas, J.K. (author) / Henshaw, H. (author)
Colliery Engineering ; 17
1940
2 pages
Article (Journal)
English
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Experiments with reinforced concrete props at coal face
| Engineering Index Backfile | 1940
Trials with concrete props at coal face
| Engineering Index Backfile | 1942
Trials with concrete props at coal face
| Engineering Index Backfile | 1942
Trials with concrete props at coal face
| Engineering Index Backfile | 1942
Engineering Index Backfile | 1940