5i8 
Journal of Agricultural Research 
Vol. XI, No. io 
width of the slab 16 feet in span and 32 feet in width under the centrally 
applied concentrated load was 11.2 feet, and that this value remained 
unaltered when one edge was split off, reducing the total width suc¬ 
cessively to 29, 25, and 22 feet, although for these widths the load was 
eccentrically applied. When, however, the total width was reduced to ‘ 
18.5 feet, it will be observed that the effective width fell off abruptly to 
a lower value, which was only slightly reduced by splitting off sections 
from the other edge, so as to reduce the total width to 15.5,11.5 and 8.5 
feet, respectively. Finally, when the width was reduced to 5 feet, in 
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Fig. ii.—C urve showing effective width v, width of slab. 
which case the load again was applied at the center, another falling off 
in the value of the effective width is indicated. 
The curves superimposed on the curve of observed values represent 
what seems to be a logical interpretation of the somewhat peculiar 
shape of the curve. The regular dash-line curve is a graph of the values 
of the effective width for various total widths of a 16-foot slab subjected 
to a concentrated central load. It is based upon the values given in 
the foregoing table, showing the variation of effective width in slabs 
loaded in that manner. The dotted-line curve is based upon the assump¬ 
tion that the effective width of an eccentrically loaded slab (be) is equal 
to that (be) of a centrally loaded slab of the same total width when the 
distance from the load to the nearer edge (D) is greater than one-half 
