DarLy OBSERVATIONS OF MAGNETOMETERS, AUGUST 17— SEPTEMBER 15. 1841. 8 
Gottingen BIFILAR. BALANCE. Gottingen BIFILAR. BALANCE. 
Mean Time of || Decuna- Mean Time of _ || DecLina- ——— 
Declination TION. Cor- |Thermo-|| Cor- |/Thermo Declination TION, Cor- |Thermo-| Cor- |Thermo- 
Observation. rected. | meter. || rected. | meter. Observation. rected. | meter. || rected. | meter. 
aoh m. r Se. Div. °  ||Mie.Div.} _° dyin: y Se. Div. = Mic.Diy.| ° 
Aug. 17 20 0} 131-30 528-7| 53-6 || 781-5| 54-7 | Sept. 1 20 0 543-9 | 54-6 |] creer | cesses 
23 0|| 137-21 || 528:0| 56-4 |) 724-4 56:3 23 0 541-1} 57-1 |] ceeeee | ceeeee 
Aug. 18 2 0|| 141-73 551-5| 60-8 || 694-2] 59-7 |Sept. 2 2 0 559-6] 60-6 || see-s- | sees 
5 0] 137-75 || 553-3) 65-3 || 712-1] 63-1 5 0 557-9 | 61-7 Wl severe | cress 
20 0|| 133-73 || 534-8] 57-4 || 750-4 57:5 20 0 542-7 | 54-2 |] wreeee | ceeeee 
23 0|| 135-57 || 530-7| 59-6 |] 731-8] 59-2 DZ Ol) vnveeeeee [| ccecee Joceeeee He ceenee | ceceee 
PAG) (O)|| pee-nse= occeeee | seenén I) steer Eoseee Sept, 3 2 Off ceree-ceei ffl ----e2 | ceceee fp eevee | eeeree 
5 01] 138-05 || 552-7| 67-8 || 695-3) 65-7 Sf MOH Mises sence |||| ce dcco ¥|(Ntdesecri| | iecenonal) osonos 
20 0|| 127-97 || 545-0) 62-7 || 705-6 62-7 20 O|| 129-95 |} 548-9] 52-7 | veers | vere 
23 0|| 135-92 || 541-5| 65-5 || 683-2 64-7 23 O}] 135-35 |) 534-5] 52-3 |] eeeeee | seers 
Aug. 20 2 0|| 142-05 || 557-1) 69-1 || 634-5 68-1 | Sept. 4 2 O|] 142-50 }) 548-5) 51-4 |] ----- | 
5 O| 138-23 || 552-8] 70-2 || 650-7] 69-5 5 O}] 135-48 || 551-6} 50-8 |] s-.--. | --ee+ 
20 0| 130-87 || 540-2| 62-0 || 714-3] 62-7 Sept. 5 20 0] 124.23 || 541-8] 47-3 713-7| 47-9 
23 0|| 137-00 || 533-8] 60-4 || 691-5] 61-0 23 O}] 126-52 || 539-7) 48-6 || 709-3) 48-6 
Aug. 21 2 0} 145-92 538-3| 60-4 || 703-8] 60-7 |Sept. 6 2 0 133-37 || 550-1] 52-6 || 699-0) 51-6 
5 O|| 139-76 || 549-7| 59-9 || 722-3) 60-1 5 0] 130-49 || 560-7] 55-6 |) 698-5] 54-1 
Aug. 22 20 0} 138-75 523-3| 56-8 || 683-2] 57-3 20 O}| 123-35 || 544-5] 47-1 || 711-0] 47-6 
23 0|| 135-15 || 536-7| 58-0 || 675-2| 58-2 23 O]] 128-40 || 545-0] 49-4 | 699-9] 49-0 
Aug. 23 2 0] 143-25 || 541-5 61-6 || 676-3| 61-7] Sept. 7 2 O} 133-07 551-0| 52-5 || 688-0} 51-3 
5 O|| 143-57 || 543-2] 63-7 || 718-5] 62-7 5 || 131-27 || 565-0] 54-6 | 698-0) 53-1 
20 0|| 150-30 || 504-5| 53-6 || 671-6] 54-1 20 O|| 124-79 || 506-2) 51-1 || 695-8) 51-6 
23 0] 137-21 || 522:0| 54-5 || 709-6) 54-9 23 0|| 128-69 || 504-6] 52-3 || 699-8] 52-1 
Aug. 24 2 0|| 140-56 || 542-5 57-1 || 714-1| 56-9] Sept. 8 2 O}/ 133-53 514-3] 53-6 || 683-0) 53-1 
5 0|| 136-90 || 550-5| 60-1 |) 695-3} 59-7 5 O}] 129-10 || 517-5} 54-5 |) 693-6] 53-7 
20 0} 132-27 || 545-8] 56-6 || 718-8| 56-7 20 0)|| 122-64 || 503-6] 46-9 || 721-8) 47-4 
23 0|| 136-00 || 544-6] 59-3 || 700-5) 58-7 23 O|| 127-14 || 499-9] 48-7 || 722-4) 49-0 
Aug. 25 2 O} 141.47 || 557-9) 63 6 || 656-8| 62-2 | Sept. 9 2 O|f 134-17 || 511-9) 52.9 695-7| 51-9 
5 0] 136-88 || 555-3| 65-7 || 669-3) 64-2 5 O|| 130-23 || 520-1) 55-7 || 688-9} 54-3 
20 0|| 130-49 || 546-4) 61-5 || 691-1] 61-2 20 O|| 123-77 || 516-6) 58-6 || 681-3) 58-0 
23 0|| 137-57 || 543-1] 64-1 || 658-4] 63.3 23 0|| 128-17 || 514-7} 60-1 || 672-9) 59-5 
Aug. 26 2 0] 145-39 || 552-8} 65-5 663-6| 64-6 | Sept. 10 2 0|| 134-59 || 522-4) 62-1 655-8| 61-2 
5 0|| 143-11 || 570-2] 66-5 || 710-3] 65-8 5 0O|| 131-03 || 529-6] 62-6 || 660-4] 62-1 
20 0] 144-62 || 535-8| 62-1 || 605-6} 62-2 20 O|| 127-07 || 514-9} 59-0 || 656-8) 58-9 
23 0|| 138-93 || 548-3) 62-3 || 676-0] 62.2 23 0|| 128-27 || 517-7| 59-9 || 665-8] 59-5 
Aug. 27 2 0|| 152-00 |) 551-2] 65-4 696-6| 64-7 |Sept.11 2 0}| 134-55 |} 525-1) 62-1 657-3 | 61-4 
5 0|| 139-65 || 559-3| 67-5 || 734-5) 66-3 FAT (6)) | Meopeecae Ar. ||fecbuce 4 |igdguoem lisosoosa: | lanmecnt 
20 0|| 137-18 || 545-4] 63-0 || 672-4] 63-8 Sept. 12 20 O|| 127-27 |) 531-3) 61-6 590-0} 62-2 
23 0] 141-78 || 523-9] 64-5 |) 718-3) 65-1 23 O]| 144-15 || 509-5] 63-1 || 644-2) 63-2 
Aug. 28 2 O| 147-63 || 554-5) 67-6 712.3| 67-4 |Sept.13 2 0|/ 139-90 || 541-0) 69-3 655-9| 68-4 
5 O|| 139-72 || 563-4] 69-8 || 690-6| 67-8 5 O|] 129-49 || 539-3] 73-6 || 727-8) 71-6 
Aug. 31 20 O]] 143-35 || 508-6) 50-1 |) ----+ | sss-- Sept. 14 20 O]| 131-45 |) 520-4) 61-8 675-8| 62-0 
23 O]] 143-24 || 535-5] 53-1 |) ---e+. | sess 23 O|| 135-28 || 519-5) 64-0 || 674-8] 63-1 
Sept. 1 2 0] 142-08 || 564.7 57-6 || veeeee | tees Sept.15 2 O}| 135.43 529-5| 68-3 || 652-8| 67-0 
y 5 O}] 134-35 |) 559-1] 58-8 || --s0-. | vee 5 O|| 132-13 || 532-6) 69-5 || 657-6) 68-1 
Birman. Aug. 44  —Sept. 74 5» 4=0:0001522 g—0:000304=2:00 Scale divisions. 
BALANCE. Aug. 44 
» 
Sept. 74 20h—Sept. 30¢ 
—Aug. 284 
—Sept. 304 
Sept. 54 
Aug. 202 22», Extra observations made during a thunder storm. 
Aug. 304. Mr Simms adjusted the agate planes of the Balance Magnetometer, making them parallel to each other; he also 
k=0:0001464 g=0:000304=2:08 Scale divisions. 
%=0:0000143 g=0:000073=5'10 Micrometer divisions. 
k=0:0000127 g=0:000073=5'74 Micrometer divisions. 
inserted spider’s threads in lieu of the silver wire for the bisection crosses, and adjusted the Micrometers. 
Sept. 34. Remaining observations for 
Sept. 747. Torsion circle of Bifilar 
middle of the scale. 
the day not made, on accoun' 
Magnetometer moved from 114° 
+ of alterations being made in the Balance Magnetometer. 
50’ to 114° 0’, in order to bring the readings nearer the 
