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 Coal Min vol. 6, no. 1, Jan. 1929 pp. 32-33 and 35, 9 figs; Colo. School of Mines Mag., vol. 19, no. 2, Feb. 1929, pp. 41-42, 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 Coal Min vol. 6, no. 1, Jan. 1929 pp. 32-33 and 35, 9 figs; Colo. School of Mines Mag., vol. 19, no. 2, Feb. 1929, pp. 41-42, 9 figs.)
Mechanization of timbering for roof supports
Coal Min. Mgmt
1929
3 pages
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