MAGNETIC OBSERVATIONS 



The value q =0.000192 was used in the computation of horizontal intensity at Teplitz Bay. 

 Only the difference in temperature between oscillations and deflections is involved in this com- 

 putation, and it rarely exceeded 2". For this value of §' a value of {t' — ^) of 2° would affect the 

 value of H only \}{y (.0000125 C. G. S.), so it is evident that no revision of the computation 

 is required. For the reduction of the values of the magnetic moment to the same temperature 

 in order to obtain an estimate of the accuracy of the observations, a value oiq-= 0.00030 was 

 adopted as the best value to be obtained from the above varying values. It is probable that q 

 varies with the temperature, increasing as the temperature increases, but the observations are 

 not sufficiently accurate to determine the relation. 



The induction coefficient has been determined as follows : 



The first distribution coefficient, P, has been determined from deflections at two distances 

 as follows : 



The scale value of long magnet has been determined at var ious times,, t.he recent values 

 being : 



The constants adopted for magnet No. 4 of magnetoineter No. Illl for the reduction ot the 

 Teplitz Bay observations are as follows : 



