t 
ABSTRACTS FOR THE HORIZONTAL FORCE. 
143 
TABLE XII.—The least and greatest Readings of the Bifilar Magnetometer for each Month, from the Daily 
Observations. 
q 
Month. 
1841. 
July 
August 
September 
October 
November 
1842. 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
1841. 
July 
August 
September 
October 
November 
December 
Bifilar Magnetometer. 
Lowest. 
Gottingen - 
Mean Time. Reading. 
a h m. Sc. Div. 
19 23 0 426-9 
423 0 492.4 
3 23 0 524-5 
6 23 0 447-8 
18 20 0 438-0 
21 23 0 496-0 
123 0 497-7 
27 23 0 490-2 
14 20 0 446-8 
17423" 0 495-6 
13 23 0 490-8 
3 20 0 429-6 
5 23 0 479-8 
28 23 0 492-3 
16 23 0 507-4 
21 20 O 492-2 
Chet) 520-4 
Highest. 
Gottingen : 
Mean Time. Reading. 
a bh m Sc. Div. 
21 5 0 501-1 
26 5 0 554-8 
Bog O 875-9 
25 2 0 638-6 
18 2 0 515-9 
2 2 0 519-6 
242 0 530-4 
23 2 0 534-5 
15 5 0 549-9 
16 5 0 555-4 
20 5 0 542-8 
420 609-8 
19 5 0 574-0 
9 5 0 541-2 
20 5 0 537-5 
28 5 0 540-6 
28 2 0 542.4 
Bifilar Magnetometer. 
Lowest. 
Gottingen 
Mean Time. 
a hk m 
21 15 523 
27 22 52% 
22 23 2h 
20 14 322 
27 8 421 
22 10 323 
Reading. 
Sc. Div. 
423-6 
509-2 
543-0 
441-0 
496-5 
492-1 
Highest. 
Gottingen 
Mean Time. 
a k m. 
22 7 292 
28 6 42% 
23 6 12% 
20 11 52 
27 9 32 
23 9 123 
Reading. 
Se. Div. 
485-3 
556-6 
576-6 
525-8 
505-5 
514-4 
Range. 
Sc. Diy. 
74-2 
62-4 
351-4 
190-8 
77-9 
23-6 
32-7 
44-3 
103-1 
59-8 
52-0 
180-2 
94-2 
48-9 
30-1 
48-4 
22-0 
TABLE XIII.—The least and greatest Readings of the Bifilar Magnetometer on each Term-Day. 
In the five months of 1841, the range of Horizontal Force from the Daily Observations is about 0.05708. 
The force being below the mean of the month 0-00760 in November, and above the mean of the month 
0.04948 in September. 
In 1842, the range, in parts of the whole Horizontal force, is 0-02252. The force being below the mean of 
the month 0-01102 in July, and above the mean of the month 0-01150 in July. 
