IV PREFACE 



The author wishes to aokmwlrdur hi- mdcbtcdnr to 

 tin American Bridge Company for material assistance, and 

 in particular to Mr. O. E. Hovey, Assistant ( 'liief Engim-n 

 of this company, for his encouragement and help. The 

 author also desires to acknowledge the valuable suggestions 

 made in the revision of the original text by Professor F. H. 

 Constant, of the ( i\ il Engineering Department of Princeton. 

 To Professor William H. Burr of Columbia University, tin 

 writ T i- permanently indebted for the logical and thorough 

 instruction received from him as a student. 



G. E. B. 



I'UINCBTON UNIVERSITY 

 December. I'.H.V 



