468 



ERECTION OF STRUCTURAL STEEL. 



CHAP. XIV. 



head will be imperfect. If the rivet is too long the rivet set (snap) will force the metal out under 

 the edge of the rivet set (snap) making a bad looking job. The rivet should be heated uniformly 

 so that it will be upset for its entire length. Riveters prefer to use rivets with scant stock so that 



ines j Guy Line rFdli 'Lines fGuyLine 

 ' 



Hook' 



JL. 



* Gas Pipe 



G/N POLE, 8 TONS 



*rBoom Lines 



SHEAR LEGS 



GUY DERRICK 



1% Manila 



Front 5i// 



Elevation Section B-B 



"A" DERRICK, 3 TONS 



clj: "Manila or j "wire fine 



E/ewtion ~" Plan 



STIFF LEG DERRICK, 12 TONS 

 " Manila or wire line 



Elevation Section A-A 



VIADUCT TRAVELER, REVOLVING MASTS 

 J2 TONS 



Elevation Section A-A 



BOOM TRAVELER WITH F/XED MASTS 



12 TONS 



FIG. 1 8. DERRICKS AND TRAVELERS. 



the rivet can be upset and a perfect head formed with little labor. To drive a rivet properly the 

 rivet should be upset by striking it squarely on the end, as side blows will upset the rivet without 

 filling the hole. 



