418 



Special Reports 



Table 4H. 



-Results of Inclination Comparisons at the Standardizing Magnetic Observatory of the Department of 

 Terrestrial Magnetism at Washington, 1915. 



All values are referred to station N ; N c =En0'.2, as deiived from this series. Observers: D. O. 1911, work at 

 Em, W. F. Wallis of the Department of Terrestrial Magnetism, work at N C. A. French of the Dominion Observatory: 

 C. I. W. No. 48, H. W. Fisk of the Department of Terrestrial Magnetism. 



> These are values obtained with C. I. W. No. 4S; I. M. S. C. I. W. No. 48 = 0'.0. 



8 A magnetic storm was in progress during these observations; extreme precautions were token to make the observa- 

 tions with the two instruments strictly simultaneous. 



Table 4 1. Results of Inclination Comparisons at the Standardizing Magnetic Observatory if the Department of 



Terrestrial Magnetism at Washington, 1915. 



' All values are referred to station A,; A', = ,S ( +0'.0, as derived from this series. Observers: D. O. No. 145, C. A 

 French of the Dominion Observatory; C. I. W. No. 48, H. W. Fisk of the Department of Terrestrial Magnetism. 

 i These are the values obtained with C. I. W. No. 48; I. M. S. C. I. W. No. 48 = 0'.0. 



Assembling the chief results, we obtain : 



(4) I. M. S. Dominion Observatory (Tesdorpf magnetometer No. 1977, magnet 10) = 



+ 1'.5 (1915). 

 (4a) I. M. S. Dominion Observatory (Tesdorpf magnetometer No. 1977, magnet 14) = 



-0'.5 (1915). 

 (4b) I. M.S. Dominion Observatory (Cooke magnetometer No. 15)= 0'.3 (1915). 

 (4c) I. M.S. Dominion Observatory (Tesdorpf magnetometer No. 1977)= -0.00253/Y 



(1915). 



