GEAIN PKESSTJKES IN STORAGE BINS. 



15 



Values of fjL^ and h. 



As compiled by Ketchum, M. S., in Tlie design of walls, bins, and grain elevators. N. Y., 1911, p. 346 

 and 350, from experiments by J. Pleissner. 



Wheat. 



Eye. 



Wheat. 



Bye. 



Cribbed bin 



Kinged cribbed bin 



Small plank bin 



Large plank bin 



Reinforced concrete bin 



0.43 



.58 

 .25 

 .45' 

 .71 



0.54 

 .78 

 .37 



0.4 to 0.5 

 .4 to .5 

 .34 to .46 



.3 

 .30 to .34 



0. 23 to 0. 32 

 .3 to .34 

 .3 to .45 



.23 to .28 

 .3 



Coefficient of friction betiveen ivheat and various materials of construction of bin walls. 



From Jamieson, J. A. Grain pressures in deep bins. Canadian society of ci\'il engineers. Transactions, 

 1093. Vol. 17, part 2, pp. 554-607. Montreal, 1905. 



Material. 



Coefficient 



offriction. 



*t' 







(). 532 





.468 



0. 375 to 



.400 



. 365 to 



.375 



.400 to 



.425 



. 400 to 



.425 



.420 to 



.450 



Wheat on wheat 



Wheat on steel trough-plate bin 



Wheat on steel flat plate riveted to tie bars. 



Wheat on steel cylinders, riveted 



Wheat on cement concrete, smooth to rough 



Wheat on tile or brick, smooth to rough 



Wheat on cribbed wooden bins 



fc for wheat= 0.596. 



SELECTED LIST OF REFERENCES ON THE PRESSURE OF STORED 



GRAIN. 



Airy, "Wilfred. The pressui'e of grain. Institution of civil engineers. Minutes of 



proceedings. Vol. 131, pp. 347-358. London, 1898. 

 Bovey, H. T. Experiments in grain pressures in deep bins and the strength of 



wooden bins. Engineering news. Vol. 52, no. 2, pp. 32-34. New York, July 



14, 1904. [Originally presented as discussion of paper by J. A. Jamieson. See 



Canadian society of civil engineers. Transactions, 1903. Vol. 17, part 2, pp. 



609-635. Montreal, 1905.] 

 Cain, William. Concerning grain bin pressures and the theory of retaining walls. 



Engineering news. Vol. 51, no. 19, pp. 451-452. New York, May 12, 1904. 

 Jamieson, J. A. Grain pressures in deep bins. Canadian society of civil engineers. 



Transactions, 1903. Vol. 17, part 2, pp. 554-607. Montreal, 1905. [Also printed 



in Engineering news. Vol. 51, no. 10, pp. 236-243. New York, March 10, 1904.] 

 Janssen, H. A. Versuche iiber getreidedruck in silozellen. Der zeitschrift des 



vereins deutscher ingenieure. Vol. 39, no. 35, pp. 1045-1049. Berlin, 1895. 

 Ketchum, M. S. The design of walls, bins, and grain elevators. 1st ed. New York, 



1907; 2d ed. New York, 1911. 

 Lufft, Eckhardt. Tests of grain pressure in deep bins at Buenos Aires, Argentina. 



Engineering news. Vol. 52, no. 24, pp. 531-532. New York, Dec. 15, 1904. 

 Pleissner. J. Versuche zur ermittlung der boden- und seitenwanddrucke in getreide- 



sUos. Zeitschrift des vereins deutscher ingenieure. Vol. 50, no. 25, pp. 976-986; 



no. 26, pp. 1017-1022. Berlin, June 23, 30, 1906. 

 Prante. Messungen des getreidedruck es gegen silowandungen. Der zeitschrift 



des vereins deutscher ingenieure. Vol. 40, p. 1122. Berlin, 1896. [For abstract, 



see Prante. The measurement of grain pressure in silos. Institution of civil 



engineers. Minutes of proceedings. Vol. 129, pp. 481-482. London, 1897.] 



