Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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.
Aufsatz (Zeitschrift)
Englisch
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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