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DAILY OBSERVATIONS OF MAGNETOMETERS, JULY 11—Aveust 17. 1841. 
Gottingen BIFILAR. BALANCE. Gottingen BIFILAR. BALANCE. 
Mean Time of DECLINA- Mean Time of DEcuINAS |) ———— | 
Declination TION. Cor- |Thermo-|| Cor- Declination TION. Cor- |Thermo-|| Cor- |Thermo- 
Observation. rected. | meter. || rected. . Observation. rected. | meter. || rected. | meter. 
Se. Div. = Mie. Diy. 
469-3} 52-5 || 756-0 
458-9| 53-6 || 741-0 
483-8 | 55-7 || 758-9 
508-5| 61-0 | 744-3 
466-7| 54-1 | 772-3 
465-6| 56-4 || 737-8 
488-7| 57-3 || 758-9 
495-1 . 788-0 
478-5 3 || 763-8 
472-7 c 750-7 
480-7 760-0 
495-0 . 753-8 
464-0 . 702-6 
462-2 
483-9 
499-8 
474-6 
468-4 
483-1 
497-9 
474-6 
479-7 
492.7 
494-1 
Se. Diy. 2 Mice. Div. 3 
517-3| 57-1 || 766-0} 57-6 
504:3| 57-4 || 757-7| 57-5 
522:4| 58-8 || 748-6] 58-2 
541-8} 60-9 || 774-1] 60-1 
510-9} 59-2 || 695-6} 59-0 
513-1} 60-0 || 697-9] 59-7 
515-9} 61-9 || 802-4] 61-6 
567-7| 61-4 || 809-0] 61-0 
518-8| 56-6 || 743-1] 56-7 
513-3 H 721-3) 58-7 
531-8 - 708-4| 60-2 
532-4 a 779-1| 62-2 
=} 
cooo cooooococeoc cece cece cocer 
July 
July 
coscoe coco coeoeo SooSoSos 
482-6 
494-3 
520-6 
477-1 
444-0 
493-6 
498-2 
472-3 
460-3 
497-1 
519-2 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
cooocooco cooeosc cooo ssoosc oeoo eseese 
oocooo 
Biritar. July 114¢—July 234 k=0:0001185 g=0:000304=2'57 Scale divisions. 
5 Aug. 44—Sept. 725» %=0-0001522 g=0:000304—=2°00 Scale divisions. 
BaLance, July 11¢—July 234 k=0:0000127 g=0-000073=5:74 Micrometer divisions. 
” Aug. 4¢4—Aug, 284 k=0:0000143 g=0:000073=5'10 Micrometer divisions. 
_ _ July 154 23h, The Balance reading considerably changed, caused by a spider’s thread which was found attached to the magnet. 
Spider’s thread removed. The difference of the readings between the two Micrometers of the Balance has increased about 6 Mic. Div. 
July aoe A fibre of the suspension thread of the Declinometer found broken ; removed carefully. 
July 22 8h. The object lens of the right hand Micrometer of the Balance found loose; when screwed tight the difference be- 
tween the eens of the two Micrometers reverted to its value previously to July 154. 
a ee 234—Aug 44, A carefully prepared thread placed in the Declinometer, from which the torsion was completely removed 
after hanging a few days with the brass bar attached. The Bifilar and Balance Magnetometers readjusted, the magnets being placed 
with their poles in directions opposite to that which they previously occupied. See Introduction. 
