RESULTS OF THE MAGNETICAL OBSERVATIONS. 



MAGNETIC DECLINATION. 

 STATION No. I. VERA CRUZ. 



Magnetic azimuth of the mark A .... . N. 52 19 . 8 \V. 



Astronomical &quot; &quot; &quot; N. 44 2.9 W. 



Magnetic declination, 1850, August 7, at noon .... 8 10.9 E. 



STATION No. II. POTRERO. 



Magnetic azimuth of the mark A . . . . . N. 83 2 .8 W. 



Astronomical &quot; &quot; &quot; N. 74 23.0 W. 



Magnetic declination, 1850, August 17, 7 1 13 &quot; A. M. 8 39.2 E. 



STATION No. III. COCOLAPAM NEAR ORI/ABA. 



Magnetic azimuth of the mark A . . . . . . N. 79 32 . 8 E. 



Astronomical &quot; &quot; &quot; N. 88 1.1 E. 



Magnetic declination, 1850, August 27, 10 1 8 &quot; A.M. . 8 28.3 E. 



STATION No. IV. SAN ANDRES CiiAi,cim:oMui,A. 



Magnetic azimuth of the mark A .... . N. 10 40 .4 W. 

 Astronomical &quot; &quot; &quot; N. 2 27.0 W. 



Magnetic declination, 1850, September 17, O 1 40&quot; P. M. 8 12.8 E. 



STATION No. V. MIRADOR. 



Magnetic azimuth of the mark A . . . N. 101 49 .7 E. 



Astronomical &quot; &quot; &quot; N. 109 51.3 E. 



Magnetic declination, 1850, October 10, 7 h 12&quot; A. M. 8 1.0 E. 



STATION No. VI. CITY OF MEXICO. 



Magnetic azimuth of the mark A . . . . . . N. 100 22 .G W. 



Astronomical &quot; &quot; &quot; N. 97 30.1 W. 



Magnetic declination, 1850, December 11, 10 1 19&quot; A.M. . 8 40.5 E. 



STATION No. VIII. RANCIIO TLAMACAS. 



Magnetic azimuth of the mark A . . . . . . N. 145 7 .3 E. 



Astronomical &quot; &quot; &quot; N. 153 35.7 E. 



Magnetic declination, 1857, January 25, I 1 19 m P. M. . 8 28.4 E. 



HORIZONTAL INTENSITY. 



The constants K and &amp;lt;j for the magnet D 3, which was exclusively used in the experiments of vibrations 

 and deflections, had been determined in 1855 by Mr. CHAS. A. SCHOTT, U. S. Coast Survey, and found: 

 Moment of inertia .&quot; = 2.0072, at temperature 76.2. 

 Coefficient of temperature &amp;lt;j = 0.00022. 



