CONTEX T S . 



Computation of the coefficients $(, 33, (£, fl\ G, for each c pas.-, at each station, from tin- 

 constants, J., c , £, ** f, 9, ±Q t $) and g 



XX X X X X 



Comparison of the coefficients thus computed with those found directly from the observation 



at each station ...... 



Resulting probable errors ..... 



Does the theory accurately represent the semi-circular deviation ? 



Tables showing the most important features of the deviations of each compass during the 



cruise . . . . . . . 



Hard and soft iron forces ..... 



Magnetic moment of magnets used for measuring horizontal force on board slu 

 Observations for absolute force at the Admiralty Standard Compass 

 Observations for absolute force at the After Azimuth Compass 

 Values of x 



Values of g, h, k, R and aB, for the Admiralty Standard and After Azimuth Compasses 

 Values of a, b, e, and d, for the Admiralty Standard and After Azimuth Compasses . 

 General equations for the determination of the deviations of the Admiralty Standard Compass 

 General equations for the determination of the deviations of the After Azimuth Compass 

 Variations of the hard iron force, during the cruise, at the Admiralty Standard and Aftc 



Azimuth Compasses ...... . . 



Computation of the coefficients A v B v C',, D„ E v for each compass, at places where th' 



deviations were observed on less than thirty-two points .... 



Recapitulation of results ........ 



Final conclusions ......... 



193 



196 

 198 

 199 



199 

 201 



202 

 205 

 206 



207 

 2(17 

 209 

 210 

 211 



211 



211 

 219 



220 



