521 



GAUSS' MAGNETIC CONSTANTS. 



The following is the type of these equations : 



X'ZgZ + X' n g m n + X'g + X'\g\ + &c. = x' m , 

 with similar equations for Y and Z : where 



X 'I = Xl cos $ + Z^ sin ^ and Z'% = - X sin \j, + Z cos i//. 



An explanation of the mode of formation of these equations is given at 

 the beginning of Section VIII. 



A. II. 



66 



