GRAIN PRESSURES IN STORAGE BINS. 15 
Values of vp’ and k. 
As compiled by Ketchum, M. S., in The design of walls, bins, and grain elevators. N. Y., 1911, p. 346 
and 350, from experiments by J. Pleissner. : 
Lie k 
Wheat. Rye. Wheat. Rye. 
Ori bbecub ime ean oe te rea roi ene Ee eh 0. 43 0.54 |0.4 to0.5 | 0.23 to 0.32 
umeedeniopede bimigneee na wa ee cates ae ot oe Le 208 SS Week WO ASW 1h 8} O) | Gee 
Siaraimlemkelo ines ase ees la hae 2) Cet Wea woh Sages . 25 Ol) |-c04 tO. 462 23) tor 2745 
iLenees) jollevalltec | oyha ee ee aes eer a eee aes Bi Sy tae eag as 45 = 00. -3 2238 60° 228 
eimiorced concrete bite =—.c- ser ee ae ee ences et aul 58d; n280 tor 234 43 
Coefficient of friction between wheat and various materials of construction of bin walls. 
From Jamieson, J. A. Grain pressuresin deep bins. Canadian society ofcivilengineers. Transactions, 
1093. Vol. 17, part 2, pp. 554-607. Montreal, 1905. 
Coefficient 
Material. offriction. 
pe! 
Wsiten tromimwitea leer eres ee mre ia ee a eee 0. 532 
WieatoOnsvechtrongheplave ims 22 Nees OY Ue ceca da cass cs cck eave si obs ee ade ee . 468 
Miheatiomsteel tat plate riveted: to tie: bars?: 2.02.05. 2222 eco ee ee. 0.375 to .400 
NWiheatonisteclicn Minders, riveted. 2.25.30 ese eek oe ees de sence Sadie ec es eee .365to .375 
Wiheatoncementiconerete smooth to rough. 22205628220 2 sees ee 400 to .425 
KVhesromilc on prick SMmOOLn: tO TOUSD. /0 220. bees le eee ee ee ee ee -400 to .425 
PimearOmmeniMCMnmOOdeM PINS ase eee ee be oda oe ee ek -420 to .450 
k for wheat=0.596. 
SELECTED LIST OF REFERENCES ON THE PRESSURE OF STORED 
GRAIN. 
Airy, Wilfred. The pressure 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 itber 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. Isted. New York, 
1907; 2d ed. New York, 1911. 
Lufit, 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 seitenwanddriicke in getreide- 
silos. 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 getreidedruckes 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, 1§97.] 
