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MAGNETIC OBSERVATIONS ON THE BOUNDARY LINE 



magnetic moment of the magnet, to X, the horizontal component of the earth's form, 

 by the expression ^ = i '"^ sin u, and obtain at 



Initial Point, 

 Carrizalillo, 

 San Luis, 

 Los Nogales, 



0.0477, temp. 52° 

 0.0481, " 64° 

 0.0476, " 65° 

 0.0466, " 82° 



K 



Computing for the same stations the product m X = ^^ , where T is corrected for 

 torsion, and reduced to the temperatui-e of the corresponding deflections, and eliminat- 

 ing X, we get the following values of m. 



Although the difierence in these values of m may be in a great measure due to errors 

 of observations, rather than to fluctuations in the magnetism of the magnet, still the 

 best results appear to be obtained by using the above values of m for the respective 

 stations, and assuming a unifoiTU rate of change during the inteiTals. 



Computing, lastly, m X for each of the stations, and dividing by m determined in the 

 manner indicated and reduced to the temperature of the \ibrations, we obtain the 

 values of X given in the subjoined table, which exhibits collectively the results ob- 

 tained. 



General Table of Results. 



