Vertical Component of Magnetic Force. 



387 



TABLE LII. — Mean Difference of a Single Observation of the Balance Magnetometer from the 

 Monthly Mean, at the corresponding hour, for each Hour in each Month of 1844. 



Mak. 

 M. T. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Year. 



h. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



12 



13-6 



12-6 



46-5 



33-8 



33-7 



13-2 



12-3 



29-7 



31-8 



27 



3 



22-6 



13-7 



24-2 



13 



12-9 



. 10-9 



50-9 



23-6 



31-7 



18 



2 



15 



7 



24-8 



29-5 



27 



3 



19 



7 



13-8 



23-2 



14 



11-2 



10-5 



60-8 



24-3 



30-3 



18 



4 



13 



1 



27-4 



28'0 



33 



3 



13 



7 



8-4 



23-3 



15 



120 



14-3 



50-3 



29-8 



31-0 



15 



8 



11 



6 



20-4 



30-9 



39 







13 



6 



8-9 



23-1 



16 



151 



136 



41-5 



31-3 



30-3 



13 







11 



5 



14-2 



26-7 



56 



3 



13 







9-0 



23-0 



17 



18-5 



150 



43-5 



32-1 



25-3 



16 



7 



11 



7 



12-0 



23-9 



43 



8 



11 



7 



9-4 



22-0 



18 



16-3 



140 



36-5 



24-7 



211 



15 



9 



15 



9 



13-4 



22- 1 



30 



8 



11 



5 



10-6 



19-4 



19 



140 



11-9 



23-8 



151 



18-6 



14 



6 



14 



7 



10-2 



18-2 



21 



6 



10 



5 



101 



15-3 



20 



11-9 



10-7 



15-1 



130 



17 5 



14 



3 



15 



3 



8-1 



14-7 



16 







10 



1 



9-6 



130 



21 



11-5 



12-4 



11-3 



11-4 



17-3 



13 



3 



14 



3 



6-4 



120 



11 



7 



11 



7 



9-6 



11-9 



22 



123 



136 



9-8 



9-6 



160 



12 



5 



12 



8 



7-7 



110 



13 



3 



11 



1 



9-4 



11-6 



23 



111 



160 



12-3 



13-4 



150 



14 



8 



13 



9 



10-9 



8-3 



13 



4 



12 



3 



9-1 



12-5 







8-4 



151 



13-5 



29'2 



14-2 



13 



9 



12 



8 



12-1 



9-7 



23 



8 



20 



5 



9-3 



15-2 



1 



9-6 



14-3 



17-2 



190 



13-4 



12 



8 



12 



7 



13-3 



10-6 



21 



7 



19 



3 



10-4 



14-5 



2 



11-0 



16-3 



24-7 



19-6 



14-0 



13 



1 



10 



9 



12-2 



11-3 



22 



2 



17 



6 



11-7 



15-4 



3 



120 



18-1 



24-9 



27-4 



14-5 



13 



8 



15 



8 



19-5 



19-8 



26 



3 



31 



3 



16-9 



200 



4 



10-4 



22-9 



21-5 



250 



19-9 



15 



2 



17 



4 



26-8 



27-1 



22 



5 



43 



7 



18-4 



22-6 



5 



12-4 



25- 6 



23-0 



34-9 



22-9 



15 



7 



18 



4 



26-9 



30-3 



27 



3 



45 



9 



17-8 



25-1 



6 



11-9 



27-5 



22-5 



37-9 



21-9 



14 



8 



15 



4 



29-4 



25-0 



16 



6 



36 



3 



27-6 



23-9 



7 



13-2 



22-2 



15-7 



27-6 



171 



12 



2 



16 



2 



23-6 



17-1 



21 







23 



4 



20-9 



19-2 



8 



11-6 



20-2 



15-4 



16-4 



14-7 



13 



1 



12 



8 



17-7 



8-9 



16 



9 



11 



8 



15-7 



14-6 



9 



12-2 



12-8 



30-2 



11-6 



14-5 



13 







10 



2 



11-6 



10-3 



19 







15 







11-2 



14-3 



10 



10'6 



121 



55-4 



9-7 



14-5 



13 



2 



10 



4 



10-5 



11-6 



23 



6 



23 



5 



71 



16-8 



11 



10-5 



13-7 



39-2 



16-8 



17-6 



13 



1 



11 



9 



23-0 



19-8 



18 



I 



26 



6 



7-2 



181 



TABLE LILT. — Mean Difference of a Single Observation from the Monthly Mean, at the correspond- 

 ing hour, for each Hour in each of the Astronomical Quarters, and in the Year 1844. 



Mak. 



Nor. 



Feb. 



May. 



Aug. 





Mak. 



Nov. 



Feb. 



May. 



Aug. 





M 1' 



Dec. 



March. 



June. 



Sept. 



Year. 



M T 



Dec. 



March. 



June. 



Sept. 



Year. 





Jan. 



April. 



July. 



Oct. 







Jan. 



April. 



July. 



Oct. 





h. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



h. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



12 



16-6 



310 



19-7 



29-6 



24-2 







12-7 



19-3 



13-6 



15-2 



15-2 



13 



15-5 



28-5 



21-9 



27-2 



23-2 



1 



131 



16-8 



130 



15-2 



14-5 



14 



11-1 



31-9 



20-6 



29-6 



23-3 



2 



13-4 



20-2 



12-7 



15-2 



15-4 



15 



11-5 



31-5 



19-5 



30-1 



23-1 



3 



20-1 



23-5 



14-7 



21-9 



20-0 



16 



12-4 



28-8 



18-3 



32-4 



23-0 



4 



24-2 



23-1 



17-5 



25-5 



22-6 



17 



132 



30-2 



17-9 



26-6 



22-0 



5 



25-4 



27-8 



19-0 



28-2 



251 



18 



12-8 



25-1 



17-6 



221 



19-4 



6 



25-3 



29-3 



17-4 



23-7 



23-9 



19 



11-5 



16-9 



16-0 



16-7 



15-3 



7 



19-2 



21-8 



15-2 



20-6 



19-2 



20 



10-6 



12-9 



15-7 



12-9 



130 



8 



130 



17-3 



13-5 



14-5 



14-6 



21 



10-9 



117 



150 



100 



11-9 



9 



12-8 



18-2 



12-6 



13-6 



143 



22 



10-9 



110 



13-8 



10-7 



11-6 



10 



13-7 



25-7 



12-7 



15-2 



16-8 



23 



10-8 



13-9 



14-6 



10-9 



12-5 



11 



14-8 



23-2 



14-2 



20-3 



181 



Diurnal Variation of the Mean Difference. — The mean difference for the vertical component has a well- 

 marked maximum twice, and minimum twice, in the day. In the means for the year, the principal minimum 

 occurs about 10 h a.m., the principal maximum about 5 h p.m. ; a secondary minimum occurs about 9 h p.M., and 

 a secondary maximum about 2 h a.m. The values of the maxima differ little from each other, and the principal 





