240 Determination of Pressure of Granular Substances. [Jan. 31, 



or the area of the bottom of the bin in feet multiplied by the diameter 

 of its inscribed circle in feet, and the product multiplied by 54 lbs. 

 (the weight of grain per cubic foot), equal the pressure upon the 

 bottom of the bin in pounds, whatever height the grain in the bin 

 may be, exceeding two diameters of its inscribed circle. 



Following are the weights per cubic foot of various kinds of grain, 

 as determined by myself. The loose and close fillings of the measure 

 are given in each case, but the close or pressed filling is adopted as 

 the element W in the formula. 



Weight of grain per cubic feet. 



Loosely 

 filled into 

 measure. 



Wheat :— 



Red winter 



Bombay 



California 



Walla Walla . . . 



Bessarabia 



Peas : — 



American ...... 



Indian corn : — 



White American 



Mixed „ 

 Oats : — 



Russian 



Beans : — 



Egyptian 



Barley (English).. 



lbs. 



lbs. 



49 



53| 



49 



53 



49 



53 



46 



50^ 



49 



53 



50 



54 



43| 



47 



44 



47 



28 



33 



46 



50 



39 



44 



EXPLANATION OF THE FIG-URE. 



A. Aperture through which the grain is brought into contact with the top of 



the weighing machine. 



B. Brackets to support the levers. 



A. B. Apertures in the side and bottom of the bin. 



B. B. Floor of the bin. 

 S.B. Side of bin. 



F. Free space between bin and apertures. 

 S. Slide for admitting and shutting off the grain. 

 T. Top of weighing machine. 

 R. Best for lever. 

 S.W. Sliding weight. 

 W. Suspended weights. 

 L. Levers. 



C. Counterpoise weights. 

 F.W. Frame of machine. 



