MAGNETIC OBSERVATIONS. 



195 



Coefficients of the Deviations of the After Azimuth Compass. 



Coefficients of the Deviations of the Forward Alidade Compass. 



STATION. 



DATE. 



21 



93 



6 



© 



@ 



Hampton Roa.ls . 



November I , 



1865 



— 0.025 



— 0.041 



— 0.026 



4- 0.024 



0.000 



St. Thomas 











November 18, 



1865 



— 0.025 



— 0.017 



— 0.018 



4- 0.024 



0.000 



Bahia . 











December 30, 



1865 



— 0.025 



0.000 



— 0.020 



4- 0.024 



0.000 



Monte Video 











January 24, 



1 800 



— 0.025 



+ O.OII 



— 0.021 



4- 0.0.14 



0.000 



Sandy Point 











February 10, 



18O6 



— 0.025 



4- 0.024 



— 0.021 



4- 0.024 



0.000 



Valparaiso . 











April 4, 



1 806 



— 0.025 



4- O.OI I 



— 0.023 



4- 0.024 



0.000 



Callao w . 











April 29, 



1866 



— 0.025 



4- O.OOI 



— 0.023 



4- 0.024 



0.000 



Panama. 











May 20, 



iSbb 



— 0.025 



O.OII 



— 0.023 



4- 0.024 



0.000 



Acapulco . 











June 1, 



180O 



— 0.025 



— 0.014 



— 0.023 



4- 0.024 



0.000 



San Francisco 











June 23, 



1 866 



— 0.025 



— 0.032 



— 0.034 



4- 0.024 



0.000 



Coefficients of the Deviations of the Forward Binnacle Compass. 



STATION. 



DATE. 



% 



33 



e 



£> 



<£ 



Hampton Roads . . . 



November I, 



1865 



0.000 



— 0.099 



— 0.032 



+ 0.037 



4- O.OOI 



St. Thomas 









November iS, 



1865 



0.000 



— 0.036 



— 0.020 



4- 0.037 



4- O.OOI 



Bahia . . 











December ?o, 



1865 



0.000 



4- 0.015 



— 0.020 



4- 0.037 



4- O.OOI 



Monte Video 











January 24, 



1866 



0.000 



4- 0.046 



— 0.019 



+ 0.037 



4- O.OOI 



Sandy Point 











February io, 



1866 



0.000 



4- 0.0S4 



— 0.016 



+ 0.037 



4- O.OOI 



Valparaiso . 











April 4, 



1 806 



0.000 



4- 0.046 



— 0.026 



+ 0.037 



4- O.OOI 



Callao . 











April 2Q, 



1866 



0.000 



4-0.015 



— 0.029 



+ 0.037 



4- O.OOI 



Panama . 











May 20, 



1866 



0.000 



— 0.022 



— °°33 



4- 0.037 



4- O.OOI 



Acapulco . 











June 1 , 



i860 



0.000 



— 0033 



— 0.035 



4- 0.037 



4- O.OOI 



San Francisco 











June 23, 



1 866 



0.000 



— 0.083 



— 0.056 



4- 0.037 



4- O.OOI 



Coefficients of the Deviations of the Forward Ritchie Compass. 



STATION. 



DATE. 



21 



23 



e 



£> 



(5 



Hampton Roads . . . 



November 1 , 



1S65 



0.000 



4- 0.032 



— 0.056 



4- 0.041 



O.OOI 



St. Thomas 









November iS. 



1S65 



0.000 



4- 0.032 



— 0.032 



4- 0.041 



— O.OOI 



Bahia . . 











December 30, 



1865 



0.000 



4- 0.04S 



— 0.026 



4- 0.041 



O.OOI 



Monte Video 











January 24, 



1866 



0.000 



4- 0.057 



— 0.022 



4- 0.041 



— O.OOI 



Sandy Point 











February 10, 



1 806 



0.000 



4- 0.067 



— 0.013 



4- 0.041 



— O.OOI 



Valparaiso . 











April 4, 



1866 



0.000 



4- 0.045 



— 0.032 



4- 0.041 



O.OOI 



Callao . 











April 29, 



1866 



0.000 



4- 0.028 



— 0.041 



4- 0.041 



O.OOI 



Panama. 











May 20, 



i860 



0.000 



4- O.OII 



— 0.051 



4- 0.041 



O.OOI 



Acapulco . 











June 1, 



1S66 



0.000 



4- 0.005 



— 0.056 



4- 0.041 



— O.OOI 



San Francisco 











June 23, 



i860 



0.000 



— O.OIO 



— 0.092 



4- 9.041 



O.OOI 



