00000nam 2200000za 4500 9.840250 CaOODSP 20221107151809 cr ||||||||||| 170725s1966 oncad o f000 0 eng d CaOODSP eng n-cn-ns M38-8/22E-PDF M38-8/22 Zorychta, H. (Herbert), 1922- Loads on friction props on a longwall face [electronic resource] / H. Zorychta, Fuels and Mining Practice Division ; G.S. Merrill, Dominion Coal Company Limited. Ottawa : Queen's Printer, 1966. 7 p. : charts, ill. Reprint series ; RS 22 Cover title. "Reprinted from the Canadian Mining and Metallurgical Bulletin, Vol. 58, No. 634, pp. 175-181, Feb. 1965." Historical publication digitized from print 2017 [by Natural Resources Canada]. "Based on underground measurements made at the Nova Scotia coal mines of the Dominion Coal Company, Limited, this paper presents a comparison between the physical properties of hardwood packs and steel friction props when used for longwall support. The probable loads supported by steel friction props on a longwall face at both the Dominion No. 20 Colliery and the Princess Colliery are delineated, and the results of the tests are presented in graphical form. It is concluded that the steel friction props are more efficient than the hardwood packs that they replaced as roof supports"--Abstract, p. 1. gccst Mining industry gccst Rocks gccst Physics Merrill, G. S. Canada. Natural Resources Canada. Canada. Department of Energy, Mines and Resources. Canada. Mines Branch. Reprint series - Dept. of Energy, Mines and Resources, Mines Branch ; RS 22 (CaOODSP)9.834843 PDF 3.88 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M38-8/M38-8-22-eng.pdf 300101