GRAIN PRESSURES IN STORAGE BINS. o 
Values for the pressure factors a and a may be tabulated for dif- 
ferent values of (See Table 1.) 
TABLE 1.—Pressure factors for wheat in round or other regular concrete bins. 
(Pounds per square foot in diameter.) 
H V L A Vv L 
D D D D D D 
Ons) 4.76 2.86 2.3 44.97 26.98 
Daal 9.06 5. 44 2.4 45. 46 27.28 
3 12.96 USUL 2.5 45.89 27.53 
4 16. 48 9.88 2.6 EB PY Mt Pala ht 
0 19. 67 11.80 2.7 46. 64 27.98 
6 22.56 13.53 2.8 46.96 28.18 
aU 25.17 15.10 2.9 47.25 28.34 
§ 27.53 16.52 3.0 47.51 28. 50 
9 29.67 17.80 Beal 47.75 28. 64 
1.0 31.61 18.96 3.2 47.96 28.77 
ital 33. 36 20.01 3.3 48.16 28.89 
12 34.94 20.96 3.4 48.33 28.99 
13 36.3 21.82 Ost) 48.49 29.09 
1.4 37.67 22.60 3.6 48. 63 29.18 
1.5 38. 84 23.30 3.7 48.76 29.26 
1.6 39.90 23.94 3.8 48.88 29.33 
° ILsidf 40.87 24.52 3.9 48.99 29.39 
1.8 41.74 25.04 4.0 49.08 29.45 
1.9 42.52 25. 51 5.0 49. 66 29.79 
2.0 43.23 25.94 6.0 49.88 29.92 
Bok 43.88 26. 32 7.0 49.95 29.97 
2.2 44.46 26. 67 10.0 49.99 29.99 
For use of this table see example 1, page 10. 
EXPLANATION OF PLATE I. 
The values given by Table 1 are plotted on Plate I, curve 1, showing 
the variation of vertical pressures, and curve 3, the variation of lateral 
pressures. Similar curves, 2 and 4, are plotted to show the variation 
of pressures when ¢é is assumed equal to 0.3. It is to be noted that 
values for zl when k=0.3, are to be taken from the upper line of 
figures, curve 2 being drawn to a horizontal scale of one-half the scale 
of curve 1. Curve 4, however, showing the variation of values for - 
when k=0.3 is drawn to the same scale as curves 3 and 1, and the 
values are to be read from the lower line of figures. 
It is evident from the curves that: 
A. After a height is reached of 3 to 4 times the diameter there is 
but little increase in the unit pressures, the additional weight going 
directly into the walls as a vertical load. 
B. There is considerable difference in the values obtained for the 
vertical pressures for different assumed values of £; the lateral pres- 
sures, however, are affected very little. 
