Magnetic Declination. 



227 



TABLE VI. — Diurnal Range of Magnetic Declination for each Civil Day, as deduced from the Nine 

 Daily Observations, w^ith the Mean for each Week and for each Month in 1843. 



Civil 

 Day. 



January. 



February. 



March. 



April. 



May. 



June. 



July. 



August. 



September 



. October. 



November 



December. 



1 



[ ] 



3-19 



3-60 



11-05 



10-54 



15-41 



17-36 



11-00 



14-29 



[9-35] 



9-22 



11-80 



2 



4-84 



4-05 



5-29 



[12-78] 





14-88 



[13-93] 



11-95 



21-77 



6-91 



8-17 



9-37 



3 



7-27 



3-47 



4-50 



15-84 



6-83 



17-63 



15-03 



12-62 



[14-75] 



12-79 



12-74 



[6-71] 



4 



2-56 



3-54 



9-77 



12-18 



12-23 



[12-75] 



8-97 



19-10 



13-28 



9-00 



5-65 



406 



5 



2-38 



[12-79] 



[10-38] 



19-49 



9-75 



7-75 



7-84 



7.16 



11-89 



21-48 



[7-94] 



5-25 



6 



3-60 



49-03 



15-14 



33-38 



25-50 



8-80 



7-63 



[13-30] 



13-29 



9-77 



9-29 



6-43 



7 



3-94 



9-70 



21-85 



13-78 



[12-85] 



12-05 



8-17 



9-46 



9-64 



7-06 



4-65 



5-38 



8 



[4-32] 



6-93 



5-72 



14-37 



7-87 



7-73 



10-56 



13-47 



11-02 



[9-44] 



7-17 



16-91 



9 



6-06 



8-77 



5-35 



[15-70] 



9-18 



9-04 



[9-81] 



18-02 



16-44 



8-07 



5-87 



14-54 



10 



5-31 



7-86 



5-10 



7-97 



12-55 



16-20 



14-32 



10-01 



[12-13] 



3-55 



3-26 



[12-78] 



11 



4-66 



5-81 



12-07 



13-36 



6-62 



[10-77] 



10-25 



12-96 



13-17 



6-71 



5-42 



17-39 



12 



4-41 



[10-72] 



[7-59] 



11-33 



12-68 



8-64 



7-92 



15-51 



8-75 



8-61 



[6-55] 



13-09 



13 



5-02 



22-54 



9-42 



10-22 



6-36 



13-72 



12-35 



[11-61] 



13-74 



9-63 



9-50 



9-37 



14 



4-39 



11-18 



7-26 



11-29 



[9-17] 



9-31 



9-55 



13-03 



10-34 



10-98 



7-78 



6-26 



15 



[5-59] 



8-18 



6-34 



13-43 



13-27 



9-39 



11-70 



10-98 



9-01 



[10-41] 



7-50 



3-09 



16 



9-42 



15-25 



8-67 



[10-87] 



8-85 



9-25 



[10-77] 



7-19 



8-07 



14-97 



6-02 



2-97 



17 



4-87 



4-57 



7-82 



11-36 



7-23 



9-43 



10-26 



10-56 



[13-06] 



6-91 



4-64 



[4-52] 



18 



5-45 



5-69 



21-56 



8-38 



9-87 



[9-70] 



10-87 



8-27 



21-83 



11-39 



4-00 



5-13 



19 



6-51 



[7-23] 



[12-47] 



10-55 



9-32 



7-00 



9-91 



11-77 



15-92 



8-84 



[4-70] 



3-98 



20 



4-85 



4-78 



14-19 



10-22 



8-17 



11-70 



8-98 



[10-83] 



13-18 



7-97 



3-09 



5-67 



21 



5-81 



6-59 



7-80 



10-38 



[9-51] 



11-45 



10-00 



10-28 



17-99 



4-27 



6-67 



12-33 



22 



[6-75] 



6-48 



14-80 



5-30 



7-31 





11-61 



14-27 



12-86 



[6-96] 



3-79 



3-19 



23 



9-25 



6-19 



8-69 



[9-26] 



9-35 





[16-04] 



9-85 



11-03 



5-92 



5-45 



3-36 



24 



6-86 



23-44 



8-29 



9-82 



13-05 



13-98 



32-85 



8-77 



[12-72] 



8-74 



4-87 



[5-84] 



25 



7-22 



12-30 



8-61 



10-05 



15-02 



[14-34] 



17-92 



10-76 



9-89 



6-00 



2-82 



4-61 



26 



6-32 



[9-68] 



[11-47] 



9-80 



16-33 



16-49 



14-88 



11-83 



15-57 



25-14 



[4-04] 



5-29 



27 



4-98 



3-81 



8-36 



12-13 



13-57 



13-79 



12-95 



[11-09] 



8-98 



6-06 



2-68 



6-27 



28 



11-85 



8-74 



19-12 



12-02 



[13-25] 



13-12 



11-84 



10-17 



11-04 



5-18 



4-10 



8-18 



29 



[5-93] 





25-78 



11-74 



15-17 



8-76 



14-86 



12-87 



9-30 



[11-77] 



4-31 



8-49 



30 



5-85 





9-22 



[10-65] 



9-16 



25-60 



[12-29] 



12-12 



7-07 



9-60 



3-38 



5-99 



31 



3-40 





8-92 





10-27 





11-14 



13-99 





15-43 





[7-92] 



ilean 



5-66 



10-09 



10-12 



12-38 



11-00 



12-13 



12-30 



11-78 



12-67 



9-65 



5-85 



7-63 



Monthly Means of thk Diurnal Ranges. 



The means of the diurnal ranges for January, November, and Deceinber, do not differ much from each 

 other, but they differ considerably from the means for the remaining nine months, which differ little from each 

 other. The means for the four seasons are : — 



Winter ; January, November, and December, mean of diurnal ranges, 



Spring ; February, March, and April, 



Summer ; May, June, and July, 



Autumn; August, September, and October, 



The Year, 



= 6-38 

 = 10-86 

 = 11-81 

 = 11-37 

 = 10-10 



The quantities in Table VI. shew that the monthly means are much affected by irregular disturbing 

 causes, and that if some of the larger diurnal ranges were removed, the monthly means would differ little from 

 the ranges of the monthly means of the diurnal variations. Tt is obvious that the means of the diurnal ranges 

 only differ from the diurnal ranges of the means in that the minimum or maximum of certain days does not oc- 



