1864] 



Magnetograph-traces at Kew and Lisbon. 



117 



It would thus appear that the decimation at Kew, judging from the waves, 

 is subject to greater disturbing forces than at Lisbon in the proportion of 

 r6 : 1. This ratio is not, however, quite so great as that for the hori- 

 zontal force. 



3. Vertical disturbing force. — The curves of vertical force are nearly 

 quite dissimilar. Sometimes the general march of the curves appears to 

 coincide during some time ; but in these cases we do not find an appre- 

 ciable general agreement for the majority of the various points of the wave. 



On the other hand, the small peaks and hollows of the Kew curves are 

 generally reproduced in those of Lisbon, but in the opposite direction, that 

 is to say, a sudden augmentation of the vertical force at Kew corresponds 

 to a sudden diminution of the same at Lisbon, and vice versd. 



In Table VI. we have a comparison of the principal points of the vertical- 

 force curves with respect to time. 



Table VI. — Comparison of the time of the principal corresponding points 

 of the Curves of Vertical Force at Kew and Lisbon. 





r Kew 



1 b 



m 



h m 



h 



m 



h 



m 



h 



m 



h ra 



July 15 ... 



< Lisbon ... 



\ No simi] 



arity. 

















|_ Differences 























r Kew 



2 



21 



21 17 

















16 ... 



< Lisbon 



I 



47 



20 45 



















[ Differences 







34 



32 



















TKew 



2 



45-0 



2 52 



3 



20 



7 



57 



16 



11-5 





17 ... 



< Lisbon 



2 



11-5 



2 19-5 



2 



49 



7 



23 



15 



39 







(_ Differences 







33"5 



32-5 







31 







34 







32-5 







fKew 



7^foo 



9^33 



21 



22 













18 ... 





6 



29 



9 GO 



20 



50 















[ Differences 







31 



33 







32 















r Kew 



0- 



;-io 



2 12 



2 



36-5 



3 



21 



17 



49'5 



17 58-5 



19 ... 



< Lisbon 





I 36-5 



2 



02 



2 



46 



17 



18 



17 25 





[ Differences 







32 



35"5 







34'5 







35 







31-5 



33-5 





fKew, 



3 



19-5 



18 51 



22 



03 













20 ... 



< Lisbon 



2 



46-5 



18 18-5 



21 



31 















|_ Differences 







33 



32-5 







32 















r Kew 



2 



10 



5 36-5 



6 



43 













21 ... 



< Lisbon 



I 



36 



5 oi'S 



6 



09 















[ Differences 







34 



35 







34 















fKew 



5 



06 



8 24 



12 



56 



19 



19 



19 



31 



21 38-5 



22 ... 



< Lisbon . , , 



4 



33 



7 51 



12 



22 



18 



46 



18 



57 



21 4 





[ Differences 







33 



33 







34 







33 







34 



34-5 





fKew 



18 



33 



18 37 



21 



54 













23 ... 





18 



01 



18 05 



21 



22 















[ Differences 







32 



32 







32 















fKew 



3 



29*5 



4 10 



5 



59 



16 



43 









24 ... 



■< Lisbon. . . , 



2 



56 



3 37 



5 



26 



16 



8-5 











[ Differences 







33'5 



33 ■ 







33 







34*5 









* Only the points marked with this sign are in the same direction, all the others are in 

 the opposite direction ; that is to say, an augmentation of force at Kew corresponds to a 

 diminution of the same at Lisbon, and vice versa. 



