194 



REPORT ON 



directly from the table; while the coefficients 33 and g were obtained by means 

 of the formulae 



SW£taffl+f x-j+fXj 





where is the true magnetic dip; E the earth's magnetic horizontal force, expressed 

 in English units, namely, in feet, grains, and seconds; and t the time in days, 

 counted from November 1st, 1865. The results, expressed in parts of radius, are 

 as follows: 



Coefficients of the Deviations of the Admiralty Standard Compass. 



STATION. 



DATE. 



21 



33 



6 



© 



a 



Hampton Roads . 



November I, 1865 



0.000 



4- 0.162 



— 0.003 



4- 0.017 



— O.OOI 



St. Thomas . 







November 18, 1865 



0.000 



4- 0.004 



— 0.002 



4-0.017 



— O.OOI 



Bahia 









December 30, 1865 



0.000 



-j- 0.066 



— O.OOI 



4- 0.017 



— O.OOI 



Monte Video 









January 24, 1866 



0.000 



+ 0.048 



— O.OOI 



+ 0.017 



O.OOI 



Sandy Point 









February 10, 1866 



0.000 



+ 0.024 



0.000 



4- 0.017 



O.OOI 



Valparaiso . 









April 4, 1866 



0.000 



+ 0.031 



— 0.003 



+ 0.017 



O.OOI 



Callao . 









April 29, 1866 



0.000 



+ 0.037 

 4- 0.049 



— 0.005 



-j- 0.017 



O.OOI 



Panama . 









May 20, 1866 



0.000 



— 0.006 



+ 0.017 



O.OOI 











June 1, 1866 



0.000 



4- 0.052 



— 0.007 



-j- 0.017 



O.OOI 



San Francisco 









June 23, 1866 



0.000 



+ 0.085 



O.OII 



4- 0.017 



O.OOI 



Coefficients of the Deviations of the After Ritchie Compass. 







Coefficients of the Deviations of the After Binnacle Compass. 





STATION. 



DATE. 



21 



33 



e 



© 



<s 



Hampton Roads . . . 



November 1 , 



1865 



O.OIO 



4-0.128 



— 0.022 



4- 0.038 



— 0.002 









November 18, 



i«bs 





















December 30, 



1865 



O.OIO 



4- 0.096 



— 0.002 



4- 0.038 



— 0.002 



Monte Video 









January 24, 



1S66 



O.OIO 



4- 0.098 



4- 0.002 



4- 0.038 



— 0.002 











February 10, 



1 866 



O.OIO 



4- °-°97 



4- 0.009 



+ 0.038 



— 0.002 



Valparaiso . 









April 4, 



1866 



O.OIO 



4- 0.081 



4- O.OOI 



4- 0.038 



— 0.002 



Callao . . 









April 29, 



1 86b 



O.OIO 



-4- 0.067 



— 0.004 



+ 0.038 



— 0.002 











May 20, 



1866 



O.OIO 



4- 0.055 



O.OII 



4- 0.038 



— 0.002 



Acapulco . 

 San Francisco 









June 1 , 



1866 



O.OIO 



4- 0.051 



— 0.013 



4- 0.038 



— 0.002 









June 23, 



1866 



O.OIO 



4- 0.062 



— 0.025 



+ 0.038 



— 0.002 



STATION. 



DATE. 



21 



33 



6 



£) 



<S 



Hampton Roac 

 St. Thomas 



Monte Video 

 Sandy Point 



San Francisco 



Is 







November 1, 1865 

 November 18, 1865 

 December 30, 1865 

 January 24, 1866 

 February 10, 1866 

 April 4, 1866 

 April 29, 1866 

 May 20, 1866 

 June 1, 1866 

 June 23, 1866 



0.000 

 0.000 

 0.000 



0.000 

 0.000 

 0.000 

 0.000 

 0.000 

 0.000 



4- 0.211 

 + 0.131 

 4-0.113 



4- 0.080 

 4- 0.079 

 + 0.076 

 4- 0.080 

 4- 0.080 

 4-0.119 



— 0.018 



— 0.015 



— 0.020 



— 0.025 



— 0.017 



O.OII 



— 0.005 



— 0.003 



4- O.OOI 



4- 0.034 

 4- 0.034 

 + 0.034 



4- 0.034 

 4- 0.034 

 4- 0.034 

 + 0.034 

 4- 0.034 

 + 0.034 



O.OOI 



O.OOI 



- O.OOI 



O.OOI 



O.OOI 



O.OOI 



O.OOI 



O.OOI 



O.OOI 



