GYROSCOPIC COMPASS METHODS OF SURVEYING 221 



-Wire Line 



■Wire Line 

 Socket 



Ball Bearing 

 / Swivel 



Shock 

 Absorber 



Jiminq 

 Device 



Box Level 

 6age 



Insfrumen+ 

 ■•''Rrofecfing 

 Casing 



Film Camera 



■Gyroscope 



Shock 

 "Absorber 



Gasket 



■Batteries 



■BaHery 

 Profecfive 

 Casing 



Shock 

 'Absorber 



Fig. 1. 



Fig. 2. — The box 

 level gage. 



Fig. 4. 



Fig. 3. — The camera. 



Fig. 5. — The pointer compass. 



Fig. 6. — Specimen photo strip from borehole. 

 Plate XIV. — The Sperry-Sun Well Surveying Co.'s gyroscopic compass device. 



