Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Props on longwall faces
Requirements of ideal prop discussed; various types of prop examined, from standpoint of their suitability for longwall support; condition of strata at coal face; wood props; steel girder and tubular steel props; yielding props (Continental types); concrete props; replacement of wood by steel. (See also - n 191 Jan 1940 p 13-6)
Props on longwall faces
Requirements of ideal prop discussed; various types of prop examined, from standpoint of their suitability for longwall support; condition of strata at coal face; wood props; steel girder and tubular steel props; yielding props (Continental types); concrete props; replacement of wood by steel. (See also - n 191 Jan 1940 p 13-6)
Props on longwall faces
Colliery Eng
Colliery Engineering ; 17
1940
Aufsatz (Zeitschrift)
Englisch
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