24:2 CONTINUOUS GIRDEB. [CHAP. 



bring the subject fairly within the reach of the practical engi- 

 neer, and should they be the means of calling more general at- 

 tention to this important class of structures, will not, we hope, 

 be considered as out of place in the present treatise. 



For the influence of difference of level of the supports, as well 

 as for variable cross-section and the relative economy of the 

 continuous girder, see Arts. 17 and 18 of the Appendix. 



