APPENDIX] 



NOTE TO CHAP. I. 



357 



We see also from the table just what weights, and where 

 placed, give the greatest strain of each kind in any piece. 



. Strains in tlie Flanges. The method is precisely simi- 

 lar for the flanges. Thus we scale off from our diagrams 



Tabulating these, we obtain the following table : 



This table is obtained precisely as before. Thus for P 6 the 

 strains in X a, and X b are multiples of P 1} while those in the 

 other flanges are multiples of P 7 . So also for Y c and Y e. We 

 see at once that the greatest strains are for full load, since for 

 all loads the upper flanges are always compressed and the 

 lower extended.* The above is sufficient to illustrate fully the 

 application of our method to bridges. It is evidently appli- 



* A more convenient form of tabulation is to put the weights in the left 

 vertical column and the pieces in the top horizontal line. The numbers can 

 then be more easily added. 



