1869.] Kew and Stonyhurst Declination Magnetographs. 237 



Dale 



i sec riaicji 



-L/lo LIU UclIlL C 



Duration, 

 in 



minutes. 



Amount of vertical dis- 

 turbance in units of 

 scale (hundredths of 

 an inch.) 



Abruptness repre- 

 sented by vertical 

 disturbance at Kew 

 in one minute. 



Stonyhurst 



TTilfltiS 

 IYt*\> UIMU1.- 



bance. 



loOo. 







Kew. 



Stonyhurst. 







Jan. 24. 



(1) to (2) 





52 



54 



Q." 

 O / 



1 o 



reo. o. 



\l ) lO \£ ) 



1 9 



51 



57 



4-9 



i a 

 ~r o 



» 



(2) to (3) 



; 7 



IS 



24 



2'6 





Mar. 6. 



(1) to (2) 



17 



107 



115 



6*3 



-1- 8 





(1) to (2) 



Inno* pAn. 



30 



31 



sslnvr mi rl pnrvPfl 

 jLVj \\ miu tu^vcii 



_i_ I 



■«■ 



1 1 n 11 PM 

 till UcU. 







LUo L LI X UclliLtr. 







(1) to (2) 



4 



30 



40 



7*5 



+ 10 





(3) to (4) 



12 



40 



45 



3*3 





21 (n\ 



(1) to (2) 





71 



73 



u ± 



4- 2 



21 c 



(1) to (2) 





41 



40 



OiUW allLl L III N LU. 



_ l 









LliolUI UailLc. 





21 fr^ 



(1) to (2) 



8 



30 



35 



3*5 





93 



(1) to (2) 



/ 



61 



72 





-4-11 





(3) to (4) 





doubtful. 









» • 



(5) to (6) 



3 



32 



57 





4-25 





(6) to (7) 



2-5 



30 



40 



12*0 



4-10 



I» 



(8) to (9) 



10 



70 



90 



7«ft 

 / U 



-4-90 



24. 



(1) to (2) 



12 



40 



44 



o o 



-4- X 



Apr. 1. 



(1) to (2) 



11 



57 



60 



c.o 



4- 3 



i> 



(3) to (4) 



10 



63 



70 



U O 



4- 7 



2 



(1) to (2) 



4 - 5 



21 



30 



4-7 



-r J 



»» 



(2) to (3) 



4 



11 



21 



2'8 



4-10 



» 



(4) to (5) 





30 



51 



o 



i 91 





(6) to (7) 



4 



45 



66 



11-9 

 1 X Ci 



-4-91 



>> 



(8) to (9) 



4-5 



43 



65 



J 



-4-22 





(10) to (11) 



5 



39 



63 



7.Q 

 / o 



4-24 



1 Q 



(1) to (2) 



5 - o 



35 



50 



-1 



i 1 ^ 



»» 



(3) to (4) 



55 



27 



38 



4«Q 



4-11 



>» 



(5) to (6) 



10 



74 



87 



7- t 



_U 1 ^ 

 "T" 10 



>» 



(6) to (7) 



23 



94 



99 



4*1 



_i_ 5 



27 



f 1 "\ tn (9\ 



16 



63 



60 





"3 



— O 



>» 



(0\ tn ("\\ 



\Jb) IU ^<J ) 



7 



22 



22 



1 



O 1 



o 



i> 



(4) to (5) 



6 



52 



60 



8-7 



4- 8 



May 11. 



H tr» ( 2^ 



17 



53 



53 



^•1 



o 



20. 



(1) to (2) 





20 



24 



9-Q 



4- 4 





(3) to (4 s ) 



12 



22 



23 



1 a 





20-21. 



(1) to (2) 



12 



90 



111 



7-5 



+ 21 



tf 



(2) to (3) 



1 4 



40 



65 



2-9 



+ 25 



>» 



(3) to (4) 



10 



20 



30 



2-0 



+ 10 



11 



(4) to (5) 



long con- 



65 



65 



slow and curved 









tinued. 







disturbance. 





It may be inferred from this Table that where the disturbances are slow 

 and long continued, that is to say, where there is scarcely any abruptness, 

 the amount of disturbance as represented by the traces is the same for 

 both places ; and this is quite confirmed by placing the curves the one over 

 the other, when they will be found to coincide even in their most minute 

 features. 



Let us now take the excesses of Stonyhurst over Kew for the various 

 disturbances, and endeavour to see if this element is in any way connected 

 with the abruptness of the disturbance. 



We may for convenience sake divide these excesses into four groups. 



