THE ELEMENTS 



GRAPHICAL STATICS 



AND THEIB APPLICATION TO 



FRAMED STRUCTURES, 



WITH NTJMEBOUS PRACTICAL EXAMPLES OF 



CRANES BRIDGE, ROOF AND SUSPENSION TRUSSES BRACED 

 AND STONE ARCHES PIVOT AND DRAW SPANS- 

 CONTINUOUS GIRDERS, &C., 



TOGETHEB WITH THE BEST 



V 



METHODS OF CALCULATION', 



AND CONTAINING ALSO 



NEW AND PRACTICAL FORMULA 



FOB THE 



Pivot or Draw Span Braced Arch Continuous Girder, Eta 



BY 



A. JAY DU BOIS, C.E., Ph.D. 



BIGGIN PBOFESSOB OF DYNAMIC EMGINEEBING IN THE SHEFFIELD SCIENTIFIC SCHOOL GW 



TALE COLLEGE. 



WITH AN ATLAS OF THIRTY-TWO PLATES. 



Fourth Edition, Revised and Corrected. 



NEW YORK: 



JOHN WILEY & SONS, 

 15 ASTOB PLACE. 



1883. 



