MAGNETIC OBSERVATIONS. 



183 







Coefficients of the Deviations of the After Ritchie C 



OMPAnS. 







STATION. 



DATE. 



A, 



B, 



( 





IJ . 



E, 



Hampton Roads . 



November I, 



186^ 



4- 7° 4o'.o 



+ li° 26'.5 



— 1° 



44'. 1 



4- o° >5'-5 



— o° 



54'. 5 

 37- 2 



St. Thomas 







November 1 8, 



iSbs 



+ 3 '4-4 



+ 8 .26.9 



+ 



40.4 



4-1 54-2 



— 



Bahia . . 









I >ecember 30, 



iSb:; 



+ 8 47-' 



+ 6 55. b 



— 



57-2 



4- 1 59-7 



4-0 



14.2 



Monte "Video 









January 24, 



1 Sob 

















Sandy Point 









February 10, 



1866 



+ 8 1S.4 



+ 4 3-2 



— 3 



25.6 



4- 1 14 i 



+ 



S8-S 



Valparaiso . 









April 4, 



iSbb 



+ 4 21.9 



4- 3 49-i 



+ 5 5°- 1 



+ 



12.4 



4- 2 21.0 



4-o 



7-5 



Callao . 









April 29, 



iSbb 



+ 4 19-1 



+ 



14. 1 



4 1 3°-5 



4-0 



52.0 



Panama . 









May 20, 



1866 



+ 5 20.6 



+ 4 3-' 



— 



10.2 



4- 1 170 



— 1 



33-° 



Acapulco . 









June I, 



i8bb 



+ 4 o.b 



4-4 29.1 



4- 1 



12.8 



4- I I2.S 



4- 



47.0 



San Francisco .... 



June 23, 



1866 



+ 4 11. 6 



4- 6 A (,.2 



— 1 



31-4 



4-2 28.5 



+ 



21.2 



Coefficients of the Deviations of the After Azimuth Compass. 



station. 



DATE. 



A 





B, 



c, 



D, 



E, 



Hampton Roads . 



November 1, 



1S65 



[0 



5'.o 



— 4° 



53'o 



— 0° 



9'. 1 



4- s° 



35'- 2 



4-o° 



i7'o 



St. 1 hoinas 









November 18, 



:8bS 



— I 



I7-S 



— 3 



0.9 



4- 1 



20.0 . 



4-0 



49.2 



4-0 



12.2 



Bahia 











December 30, 



i8bs 



— 3 



3 6 -9 



— 4 



28.6 



— 



19.5 



4-7 



22.0 



— 1 



5-5 



Monte Video 











January 24, 



iSbb 























Sandy Point 











February 10, 



I8b6 



— 



5-6 



— 2 



57-8 



— 



47-2 



4-7 



10.2 



— 



25-5 



Valparaiso . 











April 4, 



1806 



— 2 



16.2 



— 4 



54- 1 



4-0 



20.9 



+ S 



52-5 



4-o 



37-5 



Callao . 











April 29, 



iSbb 



— 3 



56,2 



— 2 



0.6 



— 



49. 6 



4-S 



6.S 



4-0 



35-7 



Panama . 











May 20, 



180b 



— 2 



0.9 



— 3 



47-2 



4- 1 



44.6 



4-6 



21.2 



— 



34° 



Acapulco . 











June I, 



iSbb 



— 3 



11. 2 



— 3 



25.8 



— 



0.8 



4-5 



54-2 



4-o 



2^S 



San Francisco 











June 23, 



186b 























Coefficients of the Deviations of the Forward Alidade Compass. 



station. 



DATE. 



A, 



B : 



c, 



D, 



E, 



Hamilton Roads . 



November 1 , 



1861; 



4-2° 



8'. 1 



— 2° 



2S'. 4 



— 1° 



52'.o 



4- 



4'. 2 



0° 



.0 



St. Thomas 







November iS, 



i86q 



4-o 



50.9 



— O 



35-1 



— 



46.2 



4- 



■5-7 



4-0 



20.5 



Bahia 









December 30, 



i86<; 



4-2 



9-4 



— O 



6.0 



— 



34- 1 



4- 



15.0 



4-0 



145 



Monte Video 









January 24, 



1 86b 



4-2 



71 



4-0 



57-2 



— I 



5-o 



4- 



23.0 



— 



9.8 



Sandy Point 









February 10, 



1866 



4-2 



25.6 



4-0 



58,5 



— I 



54-4 



4- 



47.0 



— 



20.2 



Valparaiso . 









April 4, 



1 86b 



4- 1 



55-2 



4-0 



30.0 



— 



53-9 



4- 



4.2 



— 



5-2 



Callao . 









April 29, 



1866 



4-o 



21.0 



4-0 



40.9 



— I 



,6.4 



4- 



29.0 



— 



6.8 



Panama . 









May 20, 



1866 



4-2 



15.2 



4-0 



1.1 



— I 



22. 1 



4- 



21.0 



— 



6.8 



Acapulco . 









June 1, 



1866 



4- 1 



8.1 



— I 



2S.4 



— 



33- 1 



4- 



52.S 



4-0 



10.2 



San Francisco 









June 23, 



i8bb 



4-0 



40.6 



' 



54.2 



— 2 



25.1 



4- 5S.0 



4-0 



21.5 



Coefficients of the Deviations of the Forward Binnacle Compass. 



STATION. 



DATE. 



A, 



B, 



c, 



D, 



E , 



Hampton Roads . 



November I, 1S65 



4- 0° 49'.o 



— 5° 



40'. 8 



— 2° 



33'-4 



4-2° 



i/'-7 



4-0° S'.2 



St. Thomas 









November 18, 1S65 



— 44-4 



— 1 



S b.2 



— O 



12.4 



4- 1 



59-5 



O 7.2 



Bahia . . 











December 30, iS6s 



4- 57.9 



4-o 



26 



5 



— 



33-8 



4-2 



6.5 



O II. 2 



Monte Video 











January 24, 1S66 



4-0 17.8 



4-2 



55 



4 



— O 



41. 1 



4- 1 



45-2 



— O 2.2 



Sandy Point 











February 10, 1866 



-I 16.5 



4-5 



16 



9 



2 



11. 



4- 2 



0.5 



— O 3.2 



Valparaiso . 











April 4, 1866 



— 14.6 



4- 1 



47 



9 



— O 



46. 1 



4- 1 



33-7 



O 9.0 



Callao . 











April 29, 1866 



— 1 3-4 



4- 1 



10 



2 



2 



6.8 



4-2 



8.2 



4- 24.7 



Panama . 











May 20, 1866 



— 2 31.9 



— 1 



1 



5 



— I 



33o 



4-2 



6.5 



— 23.5 



Acapulco . 











June I, 1S66 



— 2 31.2 



— 2 



2 



4 



— I 



41.1 



4- 2 



39-2 



4- 10.7 



San Francisco 











June 23, 1S66 



— 3 9-o 



— 4 



41. 1 



— 3 



34-9 



4- ■ 



56.5 



4- 30.2 



