MAGNETIC OBSERVATIONS. 



197 



VALUE OF THE COMPUTED MINUS THE OBSERVED COEFFICIENTS OF THE DEVIATIONS OF THE 



AFTER AZIMUTH COMPASS. 



VALUE OF THE COMPUTED MINUS THE OBSERVED COEFFICIENTS OF THE DEVIATIONS OF THE 



FORWARD ALIDADE COMPASS. 



VALUE OF THE COMPUTED MINUS THE OBSERVED COEFFICIENTS OF THE DEVIATIONS OF THE 



FORWARD BINNACLE COMPASS. 



VALUE OF THE COMPUTED MINUS THE OBSERVED COEFFICIENTS OF THE DEVIATIONS OF THE 



FORWARD RITCHIE COMPASS. 



