DATA FOR DESIGN OF STEEL GRAIN BINS. 



L - k-V 



L - ~ (i - 



321 



(8) 



Now if w is taken in Ib. per cu. ft., and R in ft., the pressure will be given in Ib. per sq. ft. 

 For (Itvp bins with a depth of more than two and one-half diameters the last term of the 

 right hand member of (8) may be omitted, and 



L' 



w-R 



(9) 



Now both i/ and k can only be determined by experiment on the particular grain and kind of 

 bin. For wheat and a wooden bin, Janssen found /*' = 0.3 and k = 0.67, making k-n' = 0.20. 



Jamieson found by experiment that for wheat k = 0.6, and he found values in Table I for // 

 with wheat weighing 50 Ib. per cu. ft. and having <f> = 28, n = 0.532: 



TABLE I. 

 COEFFICIENTS OF FRICTION // FOR WHEAT ON BIN WALLS. 



JAMIESON. 

 Wheat Weighing 50 Ib. per cu. ft., and Angle of Repose </> = 28 Degrees. 



Pleisner obtained the values of y! as given in Table II, and of k as given in Table III. 



TABLE II. 

 COEFFICIENTS OF FRICTION OF GRAIN BIN WALLS. PLEISNER. 



TABLE III. 

 VALUES OF k = LfV FOR WHEAT AND OTHER GRAINS IN DIFFERENT BINS. PLEISNER. 



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