Comparisons of Magnetic Standards, 1915-21 



413 



Table 3C. Results of Inclination Comparisons at the Christchurch Observatory, 1915, 1916, 



and 1920 Concluded. 



'Values for 1915 and 1916 are referred to west pier, using the station-differences determined in November 1915, viz, 

 west pier=jarrah peg +0'. 23 =brass pipe+0'.23; for the work of February 27 and April 11, 1916, it is assumed that any 

 station-difference between east pier and west pier is negligible; values for 1920 are referred to west pier, using station-difference 

 then determined, viz, west pier=jarrah peg+0'.01. 



2 The Christchurch values are from the magnetograms which apply for west pier. 



SUMMARY. 



Table 3D summarizes the chief results as already published in Volume 11 and as 

 given above. 



Table 3D. Summary of Corrections on Standards for Christchurch Observatory. 



The observatory standard for inclination in 1906 and 1908 was Dover dip-circle No. 147, needles 

 1, 2, and 3; the standard for 1915 to 1920 was earth inductor No. 109 by Toepfer and Son. 



Hence, we obtain weighted mean values as follows: 



(3) I. M.S.- Christchurch (Kew magnetomerer No. I)= +0'.4 (1906-1920). 

 (3a) I. M. S.- Christchurch (Kew magnetometer No. 1) = +0.00073/Y (1906-1920). 

 Qb) I. M.S. -Christchurch (Dover dip circle No. 147, needles I, 2, 3)= - P. I (1906-1908). 

 (3c) I. M.S. -Christchurch (Toepfer inductor No. 109)= -O'.l (1915-1920). 



See Res. Dep. Terr. Mag., Vol. II, pp. 229-231. 



