Component of the Eartlis Magnetism at Oxford, 443 



advantage of smaller magnets that this determination occupies 

 less time. 



The results of the whole work are exhibited in the following 

 Table. We may particularly notice the continual fall of the 

 moments*. The magnets were prepared about Feb. 8. In 

 view of this continual change it seems unlikely that measuring- 

 instruments, depending on permanent magnets, can be relied on. 



Date. 



T 

 uncorr. 



Dis- 

 tance. 



Mean 

 M. 



H. 



Diff. 



Mean H. 



("Feb. 13, morning 

 Small I 

 circle. 1 „ afternoon 



Feb. 16, evening .... 



Feb. 18, morning , 



Feb. 19 



f(l) 1m 



1 (2) afternoon . . 



f(l) 11 a.m 



Feb ' 21 (2) 12.30 p.m... 



Feb. 25, morning 



Feb. 26, morning 



March 5, afternoon . 



I morning ., 

 a. 

 afternoon 



March 9, morning . . 



21-882 

 21-899 



21 '789 



21-838 



21844 



21-909 

 21-896 



21-895 



21-897 



21-954 

 21-983 



22086 



22-111 

 22126 



21-990 



(55 



50 

 65 

 50 



100 



75 



100 



75 



100 



75 



100 

 75 



100 

 75 



100 

 75 



100 



75 



100 



65 



100 

 80 

 65 



100 



75 



100 

 75 



100 

 75 



100 

 75 



12083 

 12056 



12037 



12023 



11983 



11969 

 11974 



11977 

 11971 



11897 

 11868 



11735 



11737 

 11691 



11827 



17900 1 

 17895 J 

 17935 | 

 17886/ 



18073 1 

 18099 j 



18022 1 

 18026 f 



18081 1 



18088 f 



17963 1 

 18011/ 

 17983 1 

 18014/ 



179991 

 18000/ 

 17991 1 

 18011/ 



18015 1 

 18002 j 



18009 1 

 18007 I 

 18025 J 



18043 | 



18048/ 



18003 1 



17997/ 

 18047 | 

 18033 J 



18070 \ 

 18066/ 



- 5 

 -50 



+ 26 



4- 4 



+ 7 



+48 

 +31 



+ 1 



+20 



-13 



- 2 



+ 18 



+ 5 



- 6 

 -14 



•17897 

 •17910 



•18086 



•18024 



•18085 



•17987 

 •17998 



•17999 

 •18001 



•18008 

 •18014 



•18045 



•18000 

 •18040 



•18068 



Mean of all. 



•18011 



All. 



+ Diff. 



-Diff. 



142 



Ill 



* See Joule, Eeprint, i. p. 591 



Excluding 



Feb. 13, afternoon, 



Feb. 20 (1), (2). 



63 

 61 



