148 Magnetic Disturbance on September 2Bth and 26t7i, 1841. 



OBSERVATORY AT TORONTO, CANADA. 



Abstract of Observations taken during a remarkable disturbance on the 

 25th and 26tli September, 1841. 



Horizontal-Force Magnetometer. 



Gott. 

 Mean 

 Time. 



12 



m s 

 17 



m s 



22 



m s 

 27 



m s 

 32 



37 



m s 

 42 



m s 

 47 



25 



26 



IOa.m 



11 » 



12 „ 



1 P.M. 



2 „ 



3 „ 



4 „ 



5 „ 



6 „ 



7 „ 



8 „ 



9 » 



10 „ 



11 » 



12 „ 



1 A.M, 



2 „ 



3 „ 



4 „ 



•00850 



000 



•00428 



•00642 



•00336j 



■005651 



•01026J 



•013251 



•01412: 



•01588: 



•01449 



•01474 



•01856 



•024371 



•01667 



•010741 



•00848 



•00680 



•01316 



•00827 

 •00138 

 •00332 

 •00629 

 •00276 

 •00400 

 •01074 

 •01173 

 •01474 

 •01537 

 •01453 

 •01598 



•00906 

 •00896 

 •00170 

 •0035.' 

 •00493 

 •00219 

 •00428 

 ■00913 

 •01126 

 •01494 

 ■01571 

 ■01385 

 •01640 



•02372 

 •01735 

 •01191 

 •00966 

 •00643 

 •01292 



•02131 

 •01618 

 •01292 

 •01058 

 •00850 

 •01342| 



■00953 

 •01050 

 •00440 

 •00547 

 •00364 

 •00347 

 •00400 

 •00975 

 •01071 

 •01497 

 •01591 

 ■01423 

 •01676 

 •01767 

 •02154 

 •01686 

 •01263 

 •01060 

 •01067 

 •01347 



•00869 

 •00923 

 •00510 

 •00609 

 •00362 

 •00375 

 •00482: 

 •01048 

 •01202' 

 •01531 

 •01475 

 •01479 

 •01733 

 •01709 

 •02316 

 •01825 

 ■011171 

 •0ill4| 

 ■01325 

 •01346 



•00777 

 •00812 

 •00456 

 •00671 

 ■00397 

 •00358 

 •00604 

 •01117 

 •0l394j 

 •01434 

 •01464 

 •01491 

 •01790 

 •01660 

 •02099 

 •01752 

 •01191 

 •00985 

 •01173 

 •01279 



•00780 

 •00789 

 •00607 

 •00833 

 •00471 

 •00323 

 ■00809 

 •01142 

 •01480 

 •01428 

 •01475 

 •01479 

 •01702 

 •01659 

 •01973 

 •01807 

 •01423 

 •00920 

 •01372 

 •01243 



•00739 

 •00506 

 ■00668 

 •00759 

 •00461 

 •00346 

 •00811 

 •01 185 

 •01419 

 •01689 

 •01452 

 •01458 

 •01797 

 •01870 

 •01859 

 •02337 

 ■01374 

 •01078 

 •01144 

 •01247 



Changes of Total Intensity. 



26 



•00724^ ^00698 

 •00501, ^00467 

 •00606. ^00597 



•01213 

 •00903 

 •00770 

 •00647 

 •00346 

 •00614 



•01169 

 •00953 

 ■00779 

 ■00516 

 •00336 

 •00607 



■01144 

 ■00933 

 ■00927 

 •00606 

 •00335 

 •00630 



■011491 01151 

 •01026 00961 

 •00857 •OOSOl 

 ■00508 •00191 

 •00409 ^00394 

 •00633' 00652 



The changes of horizontal and vertical force, and of the total intensity, are expressed in 

 terms of tlie wliolc forces, and are uncorrected for variations of teuiperature, the precise cor- 

 rections for which liave not been yet determined, but the extreme coiTcctions on this account 

 •would probably fall short of •0003 in the horizontal, and •0005 in the vertical force. 



Increasing numbers denote an increase of force. 



