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L:R. Perino Page 7 -il 27, 1993 <br /> Table 1. Friction factors for selected rocks on concrete (Kvapil, <br /> 1965, p 284) <br /> TABLE I:+FOR.2tATIVE VALUES OF ANGLES OF FRICTION it ALONG THE WALL OF THE <br /> DISCHARGE HOMER FOR VARIOUS COARSE MATERIALS <br /> Type of Friction of coarse Corresponding angle Coefficient of <br /> coarse material material against a friction along wall friction along wall <br /> wall composed of 01 h <br /> Dolomite, limestone, Steel 30'-40' 0•58-044 <br /> Marble Concrete 334-43' 0.65-0.93 <br /> Wood 37' 0.73 <br /> Granite. Steel 31'-42" a60-0-90 <br /> Graywacke, Concrete 33'-42' 0-70-a90 <br /> .%lagnesite <br /> Iron ore Steel 33"-42' 0.67-0.90 <br /> (compact and Concrete 36'-43' 0.72-0.93 <br /> very compact) Wood Q. 0$4 <br /> Rock salt Steel 25'-4V 0-47-0-87 <br /> Concrete 30• -42' 0•58-0-90 <br /> Gypsum Stec] 31"-38' 0.61 -0.78 <br /> Concrete 32- -41- 0.62-0.87 <br /> Sandstone Steel 32 -42' 0.62-0.90 <br /> Concrete 34'-42' 0-61-0-90) <br /> Solid shale Steel 28--40' 0-33-0.841 <br /> Concrete N -42• 0-55-0.90 <br /> Coal Steel -'0"-40. 0.36-0.84 <br /> Coke Steel 24•-37• &45-0-75 <br />