228 Reports on Special Researches 



Table 7 B. Results of Horizontal-Iniensily Comparisons at the Cheltenham Observatory, 1908-1913. 



Series 



jLocal mean time Hor. int. obtained 



Date 



From 



1908 

 Feb. ; 



h m 



13 47 

 IS 55 



8 18 



10 25 



11 22 



14 43 

 8 44 



To 



h m 

 15 30 

 17 04 



10 07 



11 33 



14 09 



15 52 

 10 20 



C. I. W. 



7 

 19936 

 926 

 930 

 902 

 902 

 912 

 939 



Mean value of (C. I. W. Cheltenham) . 



Ill Mar. 24 13 28 15 10 i 19931 



940 

 930 

 947 

 956 

 938 

 938 

 922 



Mean value of (C. I. W. Cheltenham) . 



III 



1910 

 Apr. 



19817 

 831 

 810 

 790 

 816 

 822 



Mean value of (C. I. W. Cheltenham) . 



IV Nov. 18 13 14 15 01 i 19575 



564 

 568 

 567 

 580 

 575 

 574 

 570 

 562 

 568 

 579 



Mean value of (C. I. W. Cheltenham) . 



Cheltenham 



7 

 19951 

 946 

 946 

 919 

 925 

 935 

 954 



19950 

 965 

 954 

 964 

 976 

 960 

 949 

 933 



19831 

 846 

 824 

 806 

 826 

 838 



19589 

 579 

 579 

 585 

 595 

 594 

 593 

 583 

 582 

 587 

 596 



C. I. W.- 

 Cheltenham 



7 

 -15 

 -20 

 -16 

 -17 

 -23 

 -23 

 -15 



Remarks 



C. I. W. magnetometer 

 No. 5 used; observer, 

 J. C. Pearson. 



-18.47 or -0.00092g (weight, 1.0) 



-19 

 -25 

 -24 

 -17 

 -20 

 -22 

 -11 

 -11 



C. I. W. magnetometer 

 No. 7 used; observer, 

 H. W. Fisk. 



-18. 67 or -0.00093H (weight, 1.0) 



-14 

 -15 

 -14 

 -16 

 -10 

 -16 



C. I. W. magnetometer 

 No. 5 used; observer, 

 J. C. Pearson. (Since 

 this series, extensive 

 field work and repairs.) 



-14.27 or -0.00072g (weight, 0.5) 



-14 

 -15 

 -11 

 -18 

 -15 

 -19 

 -19 

 -13 

 -20 

 -19 

 -17 



C. I. W. magnetometer 

 No. 3 (standard) used; 

 observer, H. M. W. 

 Edmonds. 



16. 47 or -0.00084// (weight 2.0) 



'Two sets, one on March 26 and the other on March 27, were omitted because they were made during 

 a period of magnetic disturbance. 



Hence, we get from the four series the weighted mean value : C. I. W. Cheltenham = 

 -0. 00086 H (1908-1913). 



