Extreme Positions. 



255 



XXIX. — Differences of the Extreme Readings of the Three Magnetometers from the Monthly Means 

 during the Extra Observations in 1843, together with the Ranges of the Three Magnetic Elements 

 during each of the Observed Disturbances. 



Date. 





Westerly Declin 



ition. 



Bifilar Magnetometer. 



Balance Magnetometer. 



Ranges. 



Greater than 



Less than 



Reading greater 



Reading less 



Reading greater 



Reading less 



Declina- 



Horizontal 



Vertical 







Mean. 





Mean. 



than Moan. 



th 



in Mean. 



th 



in Mean. 



than Mean. 



tion. 



component. 



component. 



1843. 



h. 



' 



h. 



' 



h. 



Sc 



.Div. 



h. 



Sc. Div. 



h. 



Mic. Div. 



h. 



Mic. Div. 



' 



X=l. 



Y=]. 



Jan. 2 



6 



+ 0-03 



6 



- 20-42 



6 



+ 



16-9 



6 



- 6-8 



6 



+ 105-6 



6 



+ 71-0 



20-45 



0-00242 



0-00031 



Jan. 11 



9 



+ 0-14 



9 



-17-42 



9 





1-4 



9 



- 32-2 



9 



+ 119-4 



10 



+ 36-3 



17-56 



-00314 



•00076 



Feb. 6 



8 



+ 6-15 



10 



-36-75 



10 



+ 



1-3 



10 



- 22-9 



10 



+ 77-4 



11 



+ 12-6 



45-81 



•00247 



•00059 



Feb. 13 



11 



+ 1-59 



10 



-13-58 



11 



+ 



2-6 



10 



- 11-0 



10 



+ 12-8 



11 



+ 7-0 



15-17 



-00135 



•00006 



Feb. 14 



10 



+ 1-61 



9 



-17-22 



9 



•f 



27-9 



10 



- 14-5 



8 



+ 20-3 



9 



- 24-5 



17-38 



-00438 



-00043 



Feb. 16 



6 



+ 1-42 



8 



-13-49 



8 



+ 



11-4 



8 



- 8-5 



8 



+ 7-8 



6 



- 5-8 



16-86 



-00203 



•00014 



Feb. 23 \ 

 Feb. 24) 

 Feb. 25 



4 





9 





5 







8 





7 





20 



- 22-5 



1 25-70 

 15-04 



-00438 



•00169 



+ 16-03 

 + 2-38 



— 4-53 



+ 

 + 



19-9 



- 22-5 



+ 148-3 



11 



10 



-12-66 



10 



29-9 



11 



- 28-7 



11 



- 3-5 



10 



- 27-8 



•00602 



•00021 



Mar. 4 



11 



+ 1-38 



11 



- 8-78 



11 



+ 



5-3 



12 



- 11-2 



10 



+ 34-4 



11 



+ 3-5 



10-16 



-00169 



-00030 



Mar. 6 



14 



+ 11-24 



11 



-17-77 



14 



+ 



29-8 



17 



- 40-4 



9 



+ 37-7 



17 



-128-3 



29-41 



-00708 



•00168 



Mar. 7 



4 



+ 10-94 



8 



- 8-49 



5 



+ 



20-3 



8 



- 27-6 



8 



+ 292-7 







+ 31-1 



23-90 



•00510 



•00260 



Mar. 9 



8 



+ 1-87 



7 



- 2-68 



6 



+ 



2-2 



7 



- 16-3 



7 



+ 51-0 



6 



+ 20-3 



4-01 



•00200 



•00030 



Mar. 10 



9 



+ 2-01 



8 



_ 2-95 



8 



+ 



23-5 



10 



- 0-3 



10 



+ 14-6 



8 



- 10-4 



3-86 



-00254 



•00010 



Mar. 11 



8 



- 2-24 



10 



- 8-04 



9 



+ 



16-1 



9 



- 19-9 



10 



+ 13-6 



9 



- 16-4 



8-00 



-00367 



•00021 



Mar. 12 



13 



+ 8-02 



7 



-39-59 



5 



+ 



19-6 



14 



- 45-6 



7 



+ 37-3 



14 



-211-7 



45-02 



-00731 



•00519 



Mar. 18 



3 



+ 8-13 



6 



-11-23 



6 



+ 



32-1 







- 1-0 



6 



+ 51-0 



2 



- 6-5 



23-37 



-00465 



•00072 



Mar. 21 



8 



+ 1-96 



9 



- 8-03 



8 



+ 



22-6 



9 



- 2-4 



8 



- 24-1 



9 



- 33-2 



11-09 



-00260 



•00014 



Mar. 22 



3 



+ 7-80 







+ 1-82 



3 



+ 



19-8 







- 7-6 



4 



- 1-3 



1 



- 25-7 



7-98 



■00383 



•00029 



Mar. 29 



6 



+ 2-24 



11 



-20-76 



10 



+ 



18-2 



11 



- 31-1 



7 



+ 123-9 



10 



-142-5 



26-29 



•00506 



•00249 



Apr. 5 



7 



+ 35-43 



11 



-25-84 



5 



+ 



151-0 



13 



-125-7 



6 



+ 517-8 



13 



-259-1 



63-01 



•02927 



•00755 



Apr. 6 



3 



+ 13-32 



10 



-16-93 



4 



+ 



18-3 



14 



-115-6 



3 



+ 157-4 



14 



-386-8 



38-58 



•01445 



•00507 



Apr. 7 



18 



+ 3-44 



8 



-18-74 



8 



+ 



44-1 



9 



- 12-9 



6 



+ 43-5 



18 



- 36-2 



21-22 



•00609 



•00125 



Apr. 8 



4 



+ 0-87 



5 



-10-45 



6 



+ 



12-8 



7 



- 4-2 



6 



+ 63-5 



4 



+ 28-0 



13-48 



•00203 



-00062 



Apr. 12 



6 



+ 9-48 



9 



-15-00 



6 



+ 



17-9 



9 



- 14-9 



7 



+ 111-1 



2 



+ 6-7 



26-66 



•00423 



■00134 



Apr. 13 



20 



+ 4-78 



18 



+ 0-35 



20 



+ 



5-9 



19 



- 24-3 



18 



+ 15-0 



19 



- 51-9 



3-74 



•00303 



-00057 



Apr. 18 



6 



+ 1-66 



7 



-12-61 



7 



+ 



16-2 



7 



- 1-1 



7 



+ 98-1 



8 



+ 22-7 



15-14 



•00177 



•00073 



May 6 



12 



+ 12-85 



12 



-90-29 



8 



+ 



5-4 



11 



-417-0 



11 



+ 316-4 



11 



-685-5 



103-14 



-04278 



-00902 



May 7 



11 



+ 10-01 



14 



- 8-04 



11 





38-3 



13 



- 52-2 



11 



- 71-0 



14 



-154-3 



18-70 



•00155 



•00081 



May 10 



2 



+ 0-44 



6 



- 8-02 



6 



+ 



33-2 



3 



- 25-9 



7 



+ 40-6 



2 



+ 14-9 



13-63 



•00665 



•00048 



May 15 



8 



+ 0-28 



9 



-10-95 



8 



+ 



21-1 



9 



- 13-0 



9 



+ 175-6 



8 



+ 21-6 



11-78 



-00389 



•00129 



.June 2 



22 



+ 11-46 



20 



- 4-77 



20 







1-9 



21 



- 43-6 



21 



- 1-0 



22 



- 42-2 



19-06 



-00449 



•00038 



June 7 



10 



+ 7-35 



11 



-11-97 



11 



+ 



15-5 



12 



_ 28-1 



10 



- 26-6 



12 



- 90-0 



19-32 



•00429 



•00060 



June 13 



7 



+ 0-88 



6 



- 3-48 



7 



+ 



25-2 



6 



- 19-7 



6 



+ 53-7 



8 



+ 20-1 



3-95 



•00461 



•00032 



June 30 



18 



+ 3-45 



20 



- 4-16 



20 



+ 



0-2 



21 



- 16-2 



21 



- 12-7 



18 



- 80-0 



8-74 



•00200 



•00068 



July 1 



6 



+ 3-49 



8 



- 4-28 



8 



+ 



28-3 



9 



- 7-8 



8 



+ 13-8 



6 



+ 2-0 



9-44 



•00389 



-00014 



July 4 



8 



+ 3-67 



9 



- 8-64 



9 



+ 



22-8 



10 



4 5-5 



9 



+ 10-8 



10 



+ 13-7 



12-34 



•00205 



-00004 



July 24 



7 



+ 1-64 



10 



-29-20 



6 



+ 



51-4 



10 



- 32-0 



9 



+ 51-1 



10 



- 60-1 



33-73 



•00912 



-OOIOG 



July 24 

 July 25 



5 





11 





3 







22 

 11 



- 50-1 



- 80-3 



3 





11 







•00199 





+ 29-61 



-10-87 



+ " 



121-5 



+ 321-4 



-129-4 



45-49 



-00409 



Aug. 3 



4 



+ 2-93 



6 



- 1-39 



4 



+ 



22-2 



6 



- 2-0 



6 



- 19-4 



4 



- 39-6 



8-00 



■00222 



-00030 



Aug. 3 1 

 Aug. 4/ 

 Aug. 8 



1 





6 





6 



-j- 



22-6 



22 



- 20-7 



6 



+ 133-2 







- 23-0 



23-66 



•00696 



•00169 



+ 6-75 

 + 24-00 



-11-23 



18 



20 



+ 1-01 



19 



+ 



16-6 



18 



- 42-0 



22 



- "se-'i 



19 



- 211-8 



24-31' 



•005.57 



•00166 



Aug. 22 



1 



+ 12-74 



6 



+ 4-47 



3 



+ 



28-0 



1 



- 20-8 



6 



+ 74-9 



5 



- 36-8 



13-95 



•00581 



•00106 



Sept. 1 

 Sept. 1 

 Sept. 2 

 Sept. 18 



3 



+ 7-40 

 + 13-00 



6 



- 4-17 



5 



+ 



21-4 



4 



- 21-7 











16-50 



-00409 





20 

 12 



6 

 10 





4 

 11 





20 

 12 



- 22-2 



10 





12 





1 12.19 

 22-58 



-00390 

 •00514 





- 0-93 

 - 12-48 



+ 

 + 



5-0 

 30-7 







-00083 



+ 10-10 



-"2i-4 



- 14-2 



-100-6 



Sept. 19 



10 



+ 6-60 



7 



-14-10 



11 



+ 



28-9 



10 



- 8-2 



7 



+ 32-7 



11 



- 58-3 



17-33 



•00361 



-00102 



Oct. 4 \ 

 Oct. 5 ) 

 Oct. 16 



23 

 10 



+ 8-77 



8 

 10 





8 

 10 







23 

 10 



+ 3-1 



6 

 10 







 11 





1 30-13 

 10-27 



•00664 

 -00348 



-00096 

 -00017 



- 17-92 

 - 6-41 



+ 

 + 



'24-7 

 38-1 



+ 26-8 

 + 14-9 



- 69-'6 



- 1-6 



+ 3-86 



+ "'2-8 



Oct. 17 



4 



+ 1-18 



2 



- 9-94 



4 





3-7 



2 



- 15-8 



2 



+ 80-2 



3 



+ 49-6 



8-59 



-00159 



•00023 



Oct. 26 



4 



- 1-15 



10 



-18-10 



7 



■f 



19-4 



7 



- 14-1 



6 



+ 90-8 



11 



+ 3-5 



22-32 



•00330 



•00095 



Nov. 2 



12 



+ 0-28 



11 



- 14-45 



U 



+ 



7-9 



11 



- 32-1 



10 



+ 16-2 



12 



- 88-8 



14-73 



-00.394 



-00096 



Nov. 3 



1 



+ S-57 



8 



- 4-22 



8 



+ 



3-9 







- 10-3 



2 



+ 32-6 



23 



+ 1-9 



13-90 



-00237 



•00035 



Dec. 6 



8 



+ 2-10 



8 



- 7-18 



8 



+ 



2-9 



10 



- 10-8 



9 



+ 12-0 



11 



- 22-2 



9-28 



•00153 



•0003S 



Dec. 8 



9 



+ 8-70 



9 



-22-07 



6 





4-2 



9 



- 46-5 



8 



+ 1-5 



10 



- 3-9 



30-77 



-00461 



•00104 



Dec. 11 



7 



+ 7-85 



8 



-11-22 



11 



+ 



23-4 



12 



- 5-0 



6 



+ 21-3 



12 



- 61-0 



20-30 



■00302 



•00082 . 



Dec. 12 



2 



+ 6-97 



6 



- 9-55 



7 



+ 



8-3 



2 



- 20' 9 



4 



+ 39-3 



10 



- 16-8 



19-21 



-00312 



•00055 



Dec. 13 



10 



+ 4-59 



8 



- 3-65 



10 



+ 



5-7 



8 



- 9-7 



8 



+ 28-0 



10 



+ 0-7 



7-66 



•00148 



-00034 



Dec. 27 

 Dec. 28 



3 





4 





23 



+ 



3-0 



2 





4 





23 



- 2-1 



I 9-59 



-00170 



i 



■00018 



+ 9-12 



+ 0-21 



- 13-9 



+ 33-2 





