64 
ExtTRA OBSERVATIONS OF MAGNETOMETERS, MAy 6—JunzE 7. 1843. 
DECLINATION. BIFILAR. BALANCE, 
Mens tee. |Min.| Reading |Min.| Reading |) Min.| Reading 
of ilreduced: of Cor- of Cor- 
Obs. Obs.| rected. ||Obs.| rected. 
Oe red | eee ees m. | Se. Div. m. | Mie. Diy. 
May °6 12 || 34 | 24 33-35) 34 400-4 
35 | 24 36-31) 35 401-2 
36 411-3 
37 418-7 
38 412-8 || 38 125-0 
39 | 24 46-29) 39 4108 
40 | 24 47-92|| 40 409-4 
41 411-5 || 41 123-2 
42 | 24 49-89]! 42 416-0 
43 421-8 || 43 120-0 
44 | 24 55-81 || 44 420.4 
45 | 24 57-89] 45 429-9 
46 434-8 || 46 150-5 
47 441-3 
48 446-7 || 48 175-0 
49 | 25 7-65] 49 449-2 
50 | 25 10-09] 50 447-9 
| ol 447-9 || 51 207-1 
52 447-5 
53 449-9 || 53 235-7 
54 448-5 
55 | 25 14-48] 55 448-7 
56 446-7 
57 445.5 
58 441-4 58 276-3 
59 441-0 
May 6 13 0| 25 9-81 0 438-0 
1 437-4 1 330-0 
4 454-4 3 351-0 
5 | 24 59-69 6 388-5 
7 | 24 58-25] 7 470-7 8 402-0 
9 480-0 
10 | 24 58-01] 10 484:8 
1l 488.4 11 414-6 
13 492-1 12 420-6 
15 | 25 2-33 || 15 491-7 16 425-6 
20 | 25 9-47] 20 489.4 23 474-1 
24 487-8 
25 | 25 12-50] 25 487-0 || 26 509-6 
May 7 10 | 37 | 25 32-31] 38 463-5 || 39 586-0 
40 30-45 | 41 460-0 || 42 580-0 
May 7 12 58 531-7 
May 7 13 0 19-96|| 2 452-7 3 522-6 
5 19-39 || 7 458-0 8 520-2 
10 19-73 || 12 454-1 13 519-6 
15 19-15 || 17 447-8 
20 17-34 || 22 454:5 23 514-3 
25 15-47 || 27 461-6 || 28 508-6 
30 16-60 | 32 461-5 33 512-1 
35 14-70 || 37 459-3 | 38 501-2 
40 14-42 || 42 457-4 || 43 499-5 
45 13-61 || 47 459-1 || 48 496-9 
50 14-31 || 52 460-2 || 53 496-2 
15-09 460-1 
DECLINATION. BIFILaR, BALANCE. 
Mean tae, |Min-| Reaaing |/3in.| Reading | Min. 
Ota Reduced: of Cor- of 
Obs. Obs.| rected. || Obs.| rected. | 
ide chs m. eS y m. Se. Div. m. Mic. Diy, | 
May 7 14] 0| 25 13-84 : 
5 13:88 || 7 462-7 8 503-6 | 
May 10 2|| 0| 25 30-16] 2)| 514-7 | 3]| 664.39 
42 478-5 || 43 679-8 | 
May 10 4 0 26-13|| 2 518-1 3 696-9 | 
May 10 6 0 17-69 || 2 531-2 3 705-6 | 
15 16-68 || 17 535-6 18 707:3 | 
20 16-53 || 22 546-0 || 23 709-5 | 
30 19-29 || 32 528-2 || 33 T17-7 | 
40 20-43 || 42 521-1 | 43 715-0 © 
45 23-77 || 47 517-2 | 
May 10 8] 0 23-48) 2] 512-0 3} 708-6 
May 15 8 0 | 25 23-91 2 523-9 3 701-2 
10 533-7 
25 22-77 || 27 516-0 || 28 727-8 
30 22-58 || 32 509-8 | 33 746-0 
40 21-79 || 42 512-7 || 43 789-1 
45 22-36 || 47 507-1 || 48 803-4 
55 19-22 || 57 502-2 || 58 840-6 
May 15 9 0 17-61 2 501-7 3 843-9 
5 16:33 | 7 499-0 8 844. 
15 13-71 || 17 494.2 || 18 831-1 
20 12-13) 22 496-0 | 23 814. 
30 16-73 || 32 495-0 || 33 785- 
45 22-32 | 47 497-3 || 48 760- 
May 15 10 0 22-58] 2 497-2 3 737-2 
May 29 18 0 | 25 28-67|| 2 509-6 3 615-9 
30 23-66 | 32 507-2 || 33 618-4 
May 29 19 0 19-89 
May 29 20 0 24-53) 2 493-3 3 646-0 
10 23-39 || 12 491-0 || 13 643. 
June 2 20 0 | 25 15-79] 2] 493-8 3 
June 2 21 | 15 28-14 || 17 448.2 | 18 
30 30-74 | 32 479-9 || 33 
35 30-82 || 37 480-5 || 38 
June 2 22 0 34:85 | 2 491-8 3 
10 34-61 || 12 493-8 || 13 
30 33-42 || 32 489-0 || 33 
40 31-66 | 42 486-5 || 43 
June 2 23 0 30-05 || 2 491-4 3 
June 7 10 0 | 25 32-35 2 510-1 3 
10 28-23 || 12 515-9 13 
15 27-56 || 17 521-8 18 
20 27-87 || 22 524-7 || 23 
25 28-10 || 27 519-2 || 28 
30 26-89 || 3 513-2 || 33 
40 20-84 || 42 525-5 || 43 
45 20-48 | 47 512-2 || 48 
50 19-93 || 52 506-0 |) 53 
18-68 499-5 
BIFILAR. 
k=0:0001205, 
BALANCE. 
k=0:000015 approximately. 
BIFILAR THERMOMETER. 
BALANCE THERMOMETER. 
°, °, 
} May reas, {F153 reads, { Fon 
51°23 
154 9h, { 
50°-9. 
50°-6 
June 24 23h, { 
49°-7. 
49°-6 
May 6413) 5™, The torsion circle was turned back from 291° 45’ to 287° 41’; the readings till 13" 25™ have been corrected by +8 
Se. div., in order to make them comparable with those before 10% 30™, J 
