MAGNETIC OBSERVATIONS. 



187 



ADMIRALTY STANDARD COMPASS. 

 Equations of Condition. 



Hence 



A,-. 



= + 0.0240 



Normal Equations. 



4- 49S3-3 



- = + 0.460 



- = + O.OOIO2 



f- = 0.0016 

 x 



? = + 0.006 

 -- = 0.00023 



+ 



AFTER BINNACLE COMPASS. 

 Equations of Condition. 



