Comparisons of Magnetic Standards, 1905-14 



223 



'All values are referred to station A (observatory pier); A = B-l-3y. 

 Table 4D. Results of Inclination Comparisons at the Antipolo Obseruatory, I9t?. 



'AH values are referred to station A (observatory pier); 4 = C+5'.7. 



Assembling the chief results and referring them to I. M. S. (see p. 273), we obtain: 



(4) I. M. S.-Antipolo (Elliott magnetometer No. 28)= + l'.8 (1912). 

 (4q) 1. M. S.-Antipolo (Elliott magnetometer No. 28)= -0.00214// (1912). 

 (44) I. M. S.-Antipolo (Dover dip circle No. 7, needle 2)= +0'.6 (1912). 



NO. 5.-ATHENS OBSERVATORY. ATHENS. GREECE. 



The comparisons at the National Observatory of Greece, located at Athens, were 

 secured under difficulties, owing to the close proximity of electric-car lines and electric- 

 light and telephone wires; they were obtained in connection with Observer W. H. Shgh's 

 field work. It is not deemed worth while to give more than the mean results of the 

 comparisons made during the period August 11-22, 1911. The Observatory instruments 

 were of the small, portable type by Chasselon, viz: Chasselon magnetometer No. 22 and 

 Chasselon dip circle No. 16. The C. I. W. instruments were: C. I. W. magnetometer No. 7 

 and Dover dip circle No. 202 with needles 1 and 2, both instruments being referred to the 

 C. I. W. standards. The mean results for 1911, referred to I. M. S. (p. 273), are: 



(5) I. M. S.- Athens (Chasselon magnetometer No. 22)= -CM (12 sets. 191 1). 

 (5a) I. M. S.- Athens (Chasselon magnetometer No. 22)= -0.00236// (5^ sets, 191 1). 

 (54) I. M. S.- Athens (Chasselon dip circle No. 16)= +5'.7 (4 sets. 191 1). 



