Comparisons of Magnetic Standards, 1915-21 



4-1 r, 



Table 12C. Results of Inclination ' 'omparisons at the Lmkiapang Observatory, 1917. 



' It is assumed that any station-difference between piers Dt, and D e is negligible. 



' Results by needle 6 of circle 178, viz, i 45 35'. 5 and +45 35'. 1, rejected in means because of erratic behavior. 



SUMMARY. 



Table 12D summarizes the chief results as already published in Volume II" and 

 as given above. 



Table 12D. Summary of Corrections on Standards for Zikawei and Lukiapang Observatories. 



' Results obtained at Zikawei Observatory. 



Standard in inclination in 1907 was Dover dip circle No. 33, needle 14; Schulze earth inductor No. 42 was standard 

 for subsequent work. 



Value as derived from magnetograph scalings based on absolute observations with Observatory standard Elliott 

 magnetometer No. 49 before accident to latter. 



< Instrumental change account of accident on August 20, 1917. 



Hence, we obtain weighted mean values as follows: 



(12) I. M. S. - Lukiapang-Zikawei (Elliott magnetometer No. 49)= - l'.3 (1907-1917). 

 (12a) I. M. S.- Lukiapang-Zikawei (Elliott magnetometer No. 49)= +0.00068// (1907- 



Aug. 1917). 

 (\2b) I. M. S.-Zikawei (Dover dip circle No. 33, needle 14)=-0'.4 (1907). 

 (12c) I. M. S.-Lukiapang (Schulze earth inductor No. 42) = 0'.0 (191 1-1917). 

 (12c/) I. M.S. -Lukiapang (Elliott magnetometer No. 49) = +0.001 75// (Oct.-Nov. 1917). 



NO. 13. PILAR OBSERVATORY, ARGENTINA. 



During the stay of the Carnegie in Buenos Aires in 1917, two series of comparisons 

 were obtained at the Pilar Observatory of the Meteorological Office of Argentina, the 

 first during March and April and the second during November. The Meteorological 

 Office of Argentina is under the direction of Mr. George O. Wiggin. The first series 

 consisted of absolute observations with interchange of stations at the wooden observa- 

 tories B and D, the former being the same station as that occupied in the comparisons 

 of 1913, 6 while D is the new wooden absolute observatory erected since the comparisons 

 of 1913. The observatory D takes the place of the combined office and absolute observ- 

 atory which was in use during the visit of the Carnegie in 1911; two piers in observatory 

 D are regularly used in the Observatory work for the control of the variometers. Pier 



" See Res. Dep. Terr. Mag., Vol. II, pp. 264-267. 



1 See lies. Dep. Terr. Mag., Vol. II, pp. 245-247. 



