7 
ABSTRACTS FOR THE VERTICAL FORCE. 149 
TABLE XIX.—The Means of the Balance Magnetometer Readings minus the least Mean, in parts of the whole 
; Vertical Force, for periods of Three Months, in 1841 and 1842, for the Summer and Winter Months, and 
‘ Year of 1842. 
4 
. Periods. 204, 235, 2h, 5h, Mean. Range. 
1841. 
July, Aug., Sept. 0-00000 0-00006 0-00006 0:00037 0-00037 
Oct. and Nov. 0-00000 0.00008 0-00012 0:00029 | 0-00029 
1842. 
Jan., Feb., March 0-00211 0-00222 0-:00215 0-00225 0-00218 | 0-00014 
April, May, June 0:00146 0-00137 0-00130 0-00165 0:00144 0-00035 
July, Aug., Sept. 0:00080 0:00065 0.00062 0-00095 0-00075 0-00033 
Oct., Nov., Dec. 0-00000 0-00012 0-00016 0-:00027 0-00014 0:00027 
Jan., Feb., March, 
\ 0-00105 0-00117 0-00115 0-00126 0-:00116 0-00021 
Oct., Nov., Dee. . 
April, May, June, 
\ 0-00113 0-00101 0-00096 0:00130 0-00109 0-00034 
July, Aug., Sept. 
The Year 0-00109 0-00109 0-00106 0-00128 0-00113 0-00022 
The means for July, August, and September 1841, indicate a maximum before 23", and a minimum before 
9. the means of October and November 1841 still indicate a maximum before 23", and a minimum before 2", 
_ but it is much less evident. 
In the first quarter of 1842, a maximum at 23", and a minimum at 2", are well indicated ; in the second and 
third quarters, only the minimum before 2" is evident, but a maximum in both cases probably occurs between 20 
and 23", 
The last quarter of 1842 has the same character as that for 1841. 
The means for the winter months shew a maximum before 23", and a minimum nearer 2" than 23%, The 
_ means for the summer months shew the minimum about the same time as in the winter months, but the maximum 
‘earlier, The means for the year 1842 shew a maximum between 20" and 2, and a minimum about 1", 
In forming the above Table k was taken= 0°000013. 
TABLE XX.—The greatest and least Readings of the Balance Magnetometer for each Month from the Daily 
: Observations. 
Balance Magnetometer. 
Month. Lowest. Highest. 
Gottingen Gottingen 
Mean Time. 
Reading. Mean Time. 
Reading. 
1841. dad h Mie. Div. 4 h. Mic. Diy. 
July 19 20 733.2 Ls 916-7 
August 26 20 707-0 6 907-0 
September 24 20 639.0 25 990-2 
October 20 20 549-9 25, 2 1181-1 
November | 3 20 526-6 20. 2 769-5 
es 
MAG. AND MET. OBS. VOL. I. 2P 
