witha4-in.Transit. This makes it possible also to supply extension legs 

 with which the planchette can be leveled and for the further pur- 

 pose of condensing bulk in shipment. This tripod is sufficiently 

 subtantial to support the largest planchette and standard alidade, 

 and with a special adapter, or with a separate metallic head, it can 

 be used for a 4-in. Transit or a 4>-in. Tachy meter. 



The head mechanism is rigidly designed with an entirely new 

 method of connecting the planchette with the tripod. By unscrew- 

 ing the larger knurled head the tension is sufficiently released so 

 that the key-bolt may be entered and nicely seated in the plate of 

 the planchette, as indicated in Fig. 25. The board can then be 

 rotated by hand until oriented, and the large knurled head tightened 

 to make the connection more secure. 



The No. 85 Traverse Tripod, a modification of Mr. Gannett's 

 or Mr. Bumsted's design, as illustrated in Fig. 26, has spindle legs 



