DETAILS OF A STIFF-LEG DERRICK. 



471 



f ^ ' i*^-~ r,- ' ' - 



\ i i = / vy .y7-rf-.fr, 



&<&'.*%: * :-" 





FOOT BLOCK "H" 



***^" 



Counter Weight J/ 



' 



MAST CAP "E" 

 Weight 165* 



Lumber = 

 9./00 fard Feet. 



Weight of Lumber- 56, 300 /6s. _ 



^<? STANDARD I? Ton STIFF LKB*KK 



Tota/ Weight 46, 200 American Bridge Comp3ny 

 FIG. 21. DETAILS OF A STIFF-LEG DERRICK. 



