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A platform for research: civil engineering, architecture and urbanism
Mechanization of timbering for roof supports
Description of machine to drill hitch holes, thus preventing falls of roof and reduce cost by not using leg timbers; use of steel rail crossbar, instead of timber roof support, is also illustrated. (see also Colo. School of Mines Mag., vol. 19, no. 2, Feb. 1929, pp. 41-42, 9 figs., and Coal Min. Mgmt., vol. 8, no. 1, Jan. 1929, pp. 33-35, 9 figs)
Mechanization of timbering for roof supports
Description of machine to drill hitch holes, thus preventing falls of roof and reduce cost by not using leg timbers; use of steel rail crossbar, instead of timber roof support, is also illustrated. (see also Colo. School of Mines Mag., vol. 19, no. 2, Feb. 1929, pp. 41-42, 9 figs., and Coal Min. Mgmt., vol. 8, no. 1, Jan. 1929, pp. 33-35, 9 figs)
Mechanization of timbering for roof supports
Coal Min
Coal Mining ; 6
1929
9 Figs.
Article (Journal)
English
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Mechanization of timbering for roof supports
Engineering Index Backfile | 1929
Mechanization of timbering for roof supports
Engineering Index Backfile | 1929
Steel roof supports cut timbering costs at Nemacolin and Dehue mines
| Engineering Index Backfile | 1939
Relation between timbering and roof action
| Engineering Index Backfile | 1931