\fdO'^ - Old Forge Coal Mines

224 STRENGTH OF MATERIALS.
(597) {a) The graphic solution is shown in Fig. 51.
On the vertical through the support 0-1 is laid off equal to
the uniform load between the support and F^ ; 1-S is laid off
Scale of forces 1^800 Ih.
Scale of distance 1^4^
Fig. 51.
lb.
-g^^---^
to represent F^. 2-3 represents to the same scale the remainder
of the uniform load, and 3 in represents F^. The
pole P is chosen and the rays drawn. The polygon a b c cfJi is then drawn, the sides being parallel, respectively, to the
corresponding rays. If the uniform load between F^ and /^,
be considered as concentrated at its center of gravity, the
polygon will follow the broken line c e f. It will be better
in this case to divide the uniform load into several parts,
^-.4> -4-^, ^-^, etc., thus obtaining the line of the polygon