Comparisons of Magnetic Standards, 1915-21 



435 



Table 9E. Results of Horizontal-Intensity Comparisons at Honolulu Observatory, 1921. 



' All values are referred to station Absolute Observatory; Absolute Observatory = .1 + 20.57, as determined from this series. 

 Table 9F.- Results of Inclination Comparisons at Honolulu Observatory, 1921. 



'All values are referred to station Absolute Observatory; Absolute Observatory = A 0'. 2, as determined from this series. 



SUMMARY. 

 The following weighted mean values result from the above series I and II : 



(9) I. M. S.-Honolulu (Cooke magnetometer C. & G. S. No. 36 a ) = 0'.0 (1915-1921). 

 (9a) I. M. S.-Honolulu (Cooke magnetometer C. & G. S. No. 36)= -0.00003// (1915- 



1921). 

 (9i) I. M. S.-Honolulu (Schulze inductor C. & G. S. No. 4-0'.26) = +0'.l (1915-1921). 



NO. 10. KEW OBSERVATORY, ENGLAND. 



Series I and II, 1915. 



The comparisons of 1915 were obtained by Dr. C. Chree, Superintendent, and Mr. 

 B. Francis, Magnetic Observer, of the Observatory staff, and Observer E. Kidson of the 

 Carnegie Institution of Washington. The observations were made in the old and new 

 absolute-houses in each of which there are 3 piers lying in an east- west line; only the 

 middle and west piers in each house were used. The stations in the old absolute-house 

 have been designated m and O w , and those in the new absolute-house have been des- 

 ignated N m and N w , the subscripts m and w designating respectively the middle and west 

 piers in each case. The declination and horizontal-intensity observations were made on 

 the piers O m and N m ; m is the station used regularly for the Observatory determinations 

 of declination and horizontal intensity. The inclination observations were made on 

 the piers W and N w ; N w is the station used regularly for the Observatory inclination- 



" See page 4.'S2 with reference to corrections adopted for declination to obtain Observatory standard. 



