OBSERVATIONS FOR MAGNETIC INCLINATION. 



41 



We may now collect in one table the numerical values of the magnetic elements 

 as found in the preceding discussion. The units for the force are feet and grains. 

 -\- indicates west declination and north dip. 



The latitude of the Observatory is 39 58'.4 



And its longitude west of Greenwich . . . .75 10.1 

 Or, in time 5" 00 m 40.-3 



6 January, 1866. 



