258 



Abstracts of the Makekstoun Observations, 1843. 



TABLE XXXII. — Differences of the greatest and least Daily Means of Magnetic Declination, and 

 of the Horizontal and Vertical Components of Magnetic Force, from the Monthly Means for 

 each Month in 1843, together with the Monthly Ranges of the Daily Means. 



Month. 



Westerly Declination. 



Horizontal 



Z'ompontnt. 



Vertical C 



omponent. 





Ranges. 

































Day. 



Above 

 Mean. 



Day. 



Below 

 Mean. 



Day. 



Above 

 Meai;. 



Day. 



Below 

 Mean. 



Day. 



Above 

 Mean. 



Day. 



Below 

 Mean. 



Declina- 

 tion. 



Hor. 

 Comp. 



Ver. 

 Comp, 







/ 





/ 





o-oo 





0-rtO 





O-Oll 





o-on 



/ 



0-uo 



MO 



January 



20 



3-34 



12 



2-27 



16 



0614 



23 



0423 



11 



0200 



23 



0240 



5-61 



1037 



0440 



February 



24 



3-28 



6 



4-07 



4 



0628 



14 



0511 



24 



0223 



28 



0107 



7-35 



1139 



0330 



March 



7 



3-50 



29 



2-61 



22 



0528 



16 



0542 



7 



0663 



31 



0432 



611 



1070 



1095 



April 



6 



3-54 



20 



1-72 



29 



0453 



6 



0814 



5 



0527 



25 



0197 



5-26 



1267 



0724 



May 



30 



2-11 



6 



1-97 



29 



0952 



8 



1391 



12 



0139 



6 



0266 



4-08 



2343 



0405 



June 



14 



2-95 



20 



4-24 



10 



0596 



8 



0491 



17 



0199 



22 



0114 



7-19 



1087 



0313 



July 



8 



3-23 



24 



3-62 



24 



1176 



26 



0801 



25 



0744 



27 



0205 



6-85 



1977 



0949 



August 



22 



3-63 



24 



1-79 



3 



0689 



9 



0803 



22 



0487 



9 



0406 



5-42 



1492 



0893 



September 



28 



311 



21 



1-70 



18 



0637 



5 



0527 



11 



0147 



30 



0264 



4-81 



1164 



0411 



October 



3 



2-51 



19 



3-20 



19 



0518 



2 



0543 



17 



0377 



7 



0442 



5-71 



1061 



0819 



November 



6 



2-99 



30 



2-30 



24 



0741 



8 



0734 



15 



0156 



22 



0144 



5-29 



1475 



0300 



December 



6 



1-87 



1 



2-11 



25 



0465 



8 



0519 



2 



0163 



25 



0120 



3-98 



0984 



0283 



The Year 



Jan. 20 



6-50 



Nov. 30 



5-53 



Dec. 25 



2048 



Apr. 6 



1776 



Jan. 11 



1205 



Dec. 25 



0848 



1203 3824 



2053 



The last line in the above Table contains the diffez-ence of the greatest and least daily means from the 

 mean for the year. 



Westerly Declination. — In opposition to the result obtained for the single observations, Table XXXI., the 

 daily means deviate farther to the west of the mean than to the east of it. 



The mean of the greatest daily means in each month is 3'* 00 above the mean. 

 The mean of the least daily means in each month is 2'-63 below the mean. 



The greatest deviation of a daily mean to the west of the mean for the month is 3'- 63, occurring on 

 August 22 ; the greatest deviation of a daily mean to the east of the monthly mean occurs on June 24, 

 being 4'- 24. 



The greatest deviation of a weekly mean, as given Table I., to the west of the mean for the year, is 4'-ll, 

 occurring January 19 — 25 ; the greatest deviation of a weekly mean to the east of the mean for the year occurs 

 December 21—27, being 4'-30. 



The greatest range of the daily means for any month is that for February, being 7'" 3 5 ; the least is that 

 for December, being 3'"98. The whole range of the daily means for the year is 12''03. 



Horizontal Component. — The mean of the greatest daily means in each month is 0-000666 above the 

 monthly means, the whole horizontal component being unity ; the mean of the least daily means in each month 

 is 0-000675 below the monthly means. 



The greatest excess of a daily mean above the monthly mean is 0-001176, occurring July 24 ; the greatest 

 defect of a daily mean from the monthly mean occurs May 8, bemg 0-001391. The greatest excess of a weekly 

 mean, as given Table VIII. , above the mean for the year, occurs December 21 — 27, being 0-004500; and 

 the greatest defect of a weekly mean from the mean for the year occurs April 6 — 12, being 0-001304. 



The greatest range of the daily means for any month is that for May, being 0-002343 ; the least is that 

 for December, being 0-000984. The range of the daily means for the whole year is 0003824. 



Vertical Component. — The mean of the greatest daily means in each month is 0-000335 above the monthly 

 means, the whole vertical component being unity. The mean of the least daily means in each month is 

 0-000245 below the monthly means. 



The greatest excess of a daily mean above a monthly mean is that for July 25, being 00007 44 ; the 

 greatest defect of a daily mean from a monthly mean is that for March 31, being 0000432 below the meau 

 for the month. 



The greatest excess of a weekly mean, as given Table XV., above the mean for the year, occurs January 5 

 — ^11, being 0-001056 ; the greatest defect of a weekly mean from the mean for the year occurs December 21 

 —27, hemg 0-000792. 



The greatest range of the daily means for any month is that for March, being 0-001095 ; the least is that 

 for December, being 0-000283. The whole range of the daily means for the year is 0-002053. 



