Comparisons of Magnetic Standards, 1905-14 



245 



NO. 16.-MELB0URNE OBSERVATORY. AUSTRALIA. 



"\'arious comparisons have been obtained at the Melbourne Observatory since 1906, 

 but the final values for all the Observatory observations are not at present available. 



NO. 17. PILAR OBSERVATORY, ARGENTINA. 



During the series of comparisons, obtained in 1911 by the observers of the Carnegie, 

 4 stations were used, viz, Observatory stations Nos. 1 and 8 in the absolute house, and tent 

 stations B and C, approximately east of the absolute house and in line with Nos. 1 and 8. 

 Station No. 1 is the pier used by the Observatory for the absolute determination of declina- 

 tion and horizontal intensity, while station No. 8 is the pier for the determination of dip. 

 Station No. 8 is 9.02 meters east of pier No. 1, station B is 33.04 meters east of station 

 No. 8, and station C is 28.1 meters east of station B. The Observatory instruments were 

 hi 1911: for declination and horizontal intensity, Dover Kew magnetometer No. 138; for 

 inchnation, the mean of values as determined with Toepfer earth inductor No. 3 and with 

 Dover dip circle No. 216 (needles 1 and 2). 



The C. I. W. instruments used were: C. I. W. magnetometers Nos. 2 and 4, and Toepfer 

 earth inductor No. 2. The method of comparisons followed was that of simultaneous 

 observations with exchange of stations. 



Table 17A. Results of Declination Comparisons at the Pilar Observatory, 1911. 



'All values are referred to station B; B = No. 1 0'.9; B = C+0'.4. 

 -Mean result from both C. I. W. magnetometers, referred to standard. 



'AH values are referred to station B; B = No. 1 29.87; B = C+2.Sy. 

 ^Mean result from both magnetometers, referred to standard. 



