GYROSCOPIC COMPASS METHODS OF SURVEYING 215 



[[ 



2 



-'ygf"4M 



in. 



Fig. 2.— The 

 gyrocompass. 



jPj(j, 1. — Fig. 3. — The dip Fig. 4. — Registra- 

 Complete measurer. tion section, 



instrument. 



Plate XIII. — The Kiel Nautical Instrument Co.'s gyroscopic compass borehole 



apparatus. 



