I'UH \< I 



THK fullnuiii^ Noli-* "ii IM.it. 

 been used )>y tin- author ? 



His thr 



essary to en:iM- them to make a design and 



'.-.I -ii.i i a throu-h j-l.it. .-ir-i.-r railway bridge, 



tin* plat.* -ir.lrr han been developed so 



that it may be appli-.l to such *' s for any duty. 



imtrs may easily be given to the average elaas in 



week for one semester of the college 



year. They )ia\<- ^n-atly fa< ilitatiil the computation and 



lra\\ inn-room \\rk with my own classes. 



It i> with thr hope that they may be useful to other 

 hers. un<! engineers, that thry an- puhlisl. 



\\ Hi I.H, 



POLrnamic Ixim-nmt. BMOOK 



January, 1J 



