The Ouick Leveling Head 



Rapid leveling for setting up in nearly all classes of mountain 

 and mining work is now accomplished quite generally with the 

 extension leg tripod. Those of our manufacture are very sub- 

 stantial, but some engineers object to the possibility of vibration in 

 a tripod leg which must mainly dei>end upon a pair of clamping 

 bands and set screws for its stability. 



To meet this demand the Quick Leveling Head can be used to 

 advantage with the more substantial one-piece leg, but it has not the 

 same capacity for centering the instrument over or under a certain 

 point beyond the limitation of the shifting center. For use with 

 a level and a split leg tripod in rough country, however, this point 

 cannot be raised. 



Pig. 123 



There have been many types of quick leveling heads designed, 

 mainly on the ball-ami socket principle alter the system used for 

 generations with a surseyor's compass, but the center of gra\ity is 

 too high above the point of support and instability is the inevitable 

 consequence. 



This design consists of two wedge shaped discs interposed be- 

 tween the level; and tripod nead. The system sacrifices 

 nothing to stability and \<\ the advantages of the sh 

 center. The wedge plates may be shifted from side to side by 



