478 



STEEL BOOM TRAVELER. 



EN*. NEWS 



Front Elevation 

 FIG. 28. TRAVELER USED IN ERECTION 



4 Washer under lower 

 goose neck; '-& / 



Planff // 



Side Elevation 



OF ARMORY, UNIVERSITY OF ILLINOIS. 

 Triple Block- 



ENS. NEWS 



FIG. 29. STIFF-LEG DERRICK USED ON ERECTION TRAVELER FOR ERECTION OF ARMORY, 

 UNIVERSITY OF ILLINOIS. (Two of these derricks were used on front of traveler.) 



