MAG. AND MET. ozs. 1843, 
Sept. 184 10h 50m, 
Sept. 184 11h 45m, 
Sept. 184 12h 40m, 
Sept. 194 104 Om, 
A band of auroral light, about 10° altitude, seen among the clouds to NNW. 
Auroral light still visible, but very faint. 
The aurora has now almost entirely disappeared. 
Lightish to NNW. Auroral light ¢ 
Sept. 194114 0m, All traces of auroral light have vanished, the sky nearly clear. 
EXTRA OBSERVATIONS OF MAGNETOMETERS, SEPTEMBER 18—OcroBeEr 26. 1843. 69 
DECLINATION. BIFILAR. BALANCE, DECLINATION. BIFILAR. BALANCE, 
Min.| Reading |Min.| Reading | Min.| Reading pottingen atin Reading | Min.| Reading || Min,| Reading 
of Reduced of Cor- of Cor- of iicahach, of Cor- of Cor- 
Obs. * Obs.| rected. || Obs.|} rected. Obs. Obs.| rected. |/Obs.| rected. 
ited. m. s ci m, Se. Div. m™m. Mic. Diy. ad. h. m. cl wv m. Sc. Diy. m. Mic. Div. 
ept. 18 10°] 25 | 25 6-79 27 | 539-7 | 28) 774-9 | Oct. 4 23 5 | 25 32-87] 7] 471-9 8 | 769-0 
30 9:89 || 32 | 538-0 | 33 | 772-5 10 32:53 | 12 | 470-0 | 13 | 763-0 
| 35 12:14] 37 | 535-7 | 38 | 766-8 15 32:35 || 17 | 473-3 18 | 781-5 
{| 40 11-64] 42 | 533-2 | 43 | 760-7 20 31-46} 22 | 480-1 | 23 | 798.4 
| 45 11-28] 47 | 527-3 || 48 | 753-1 25 32-27|| 27 | 480-5 | 28] 798-7 
| 50 10-88 || 52 521-3 53 748-2 30 32-10 || 32 485-5 33 779-6 
55 10-50 || 57 515-4 58 754-9 35 32-10 || 37 490-5 38 749-8 
Sept. 18 11 0 9-47|| 2] 513-7 3 | 761-7 40 32-62|/ 42 | 491-0 | 43] 763-6 
| 5 10-08 7 510-0 § 762-9 45 32-80 || 47 492-3 || 48 750-9 
| 10 9-57] 12] 508-1 | 13 | 759-4 50 32:91] 52 | 491-0 || 53 | 771-0 
| 15 8-90 | 17 502-9 18 763-6 55 32-51 || 57 492.4 58 769:8 
20 8-40 | 22 495-9 23 765-7 | Oct. 5 O 0 32-53 2 493-6 3 770-2 
| 25 8-97 || 27 | 492-8 | 28 | 769.3 | Oct. 5 4 0 27-33 || 2| 513-2 3] 798-4 
| 30 11-73 | 32 | 492-2 | 33 | 776-0 | Oct. 5 5 || 25 16:44] 27 | 501-6 || 28 | 853.2 
} 35 15-99 || 37 487-6 38 786-0 30 16-53 || 32 505-9 33 854-9 
40 19-37 || 42 | 489-7 | 43 | 786-0 45 20:61] 47 | 507-6 || 48 | 856-7 
45 22-50] 47 | 491-6 | 48 | 782.0 | Oct. 5 6] O 25-31|} 2] 505.2 3 | 849-6 
50 23-27 || 52 493-5 53 774.3 | Oct. 5 7 |) 55 15-19 
’ 55 22-11] 57 | 503-1 | 58] 752-5 | Oct. 5 8 0 11-05) 2] 507-4 3) 302.9 
ept. 18 12 0 19:93] 2] 515-0 3 | 737-2 5 3-01) 7 | 523-7 8 783-7 
5 20-90 7 | 523-3 8 | 726-1 10 2-74 12) 535-9 || 13 | 771.4 
10 23-16] 12 | 520-4 | 13} 721-3 15 6:97] 17 | 537-0 || 18 | 763-6 
15 24.27) 17 | 521-3 | 18 | 704.4 20 11-47|| 22 | 523-8 || 23 | 762.9 
20 24-67 || 22} 519-1 | 23 | 707-1 25 10-01]| 27 | 524-1 || 98 | 752.5 
25 26-22] 27 | 518-0 | 28 | 708-5 30 11-32) 32 | 516-2 || 33. | 751-4 
30 26-86 || 32 516-4 33 710-0 35 13-17 || 37 506-7 38 755-3 
35 26-33 | 37 | 513-5 | 38 | 711-3 | Oct. 5 10 0 19-67] 21} 506-0 3 | 7663 
ept.19 6 || O | 25 19-29] 92] 509.0 3 | 838-7 | Oct. 16 10 | 0 | 25 12-36] 2) 549.3 3 | 828-9 
20 9:99] 22} 508-5 || 23] 854-5 5 18-68|| 7] 544-0 8 | 826-8 
25 8-03 | 27 | 512-6 | 28 | 858-4 10 21-28] 12 | 537-0 | 13 | 823-0 
30 7-95 || 32 515-5 3a 862-2 15 22-63 || 17 519-6 18 821-7 
35 9-47] 37 | 514-7 | 38 | 863-0 20 21-29] 22) 514-0 || 23] 819-5 
40 9-27 42 | 510-9 | 43] 861.7 25 17-41 | 27 521-2 || 28 | 815-4 
45 8-53 | 47 | 510-0 | 48} 860-1 30 15-88 | 32 | 527-3 || 33 810-4 
50 7-56 || 52 | 513-9 || 53 850-5 35 17:18 37 | 525-0 || 38] 810-4 
55 6-47|| 57 | 516-3 || 58 | 852-8 40 17-76 || 42 | 523.5 || 43 | 810-4 
ept.19 7 0 6-68 || 2] 518-3 3 | 851-4 45 17-88 
; 15 6-03 ——— a = — 
) 20 7-02|| 22 | 520-7 | 23} 848-3 | Oct. 17 2 0 | 25 18-41] 2) 4992.4 3 901-7 
ept.19 8 0 14-:01|} 2 507-3 2 846-9 5 16:73|| 7 | 503-1 8 | 898.2 
ept. 19 10 0 19-89] 2 511-2 3 780-5 10 21-02} 12 505-2 13 900-6 
10 23:36 || 12 501-3 13 774-8 15 20-40 || 17 506-0 18 901-6 
20 20-20 |) 22 515-6 23 762-0 20 21-24] 22 505-8 23 900-2 
25 18-99 || 27 517-9 28 755-5 25 22-32) 27 506-4 28 899-8 
30 15:00 || 32 | 521-6 | 33 757-6 55 24:69|| 57 | 506-1 || 58 | 875-8 
35 11-53 | 37 528-7 38 754-7 | Oct. 17 4 0 25-32 2 508-5 3 884-6 
40 10-48 | 42 | 537-9 || 43 749-7 
45 12-20] 47 | 534-8 | 48 | 750-5 | Oct. 26 4 0 | 25 22:99) 2] 500-8 3 | 879-6 
50 14-03 | 52 530-8 53 751-2 10 17-78 || 12 502-1 13 893-0 
¢ 55 15-77 || 57 526.3 58 754:3 | 15 16-38 || 17 504:5 18 897-7 
19 11 0 17:02} 2} 520-8 3 757-4 | 20 14-11] 22 | 510-8 | 23 897-6 
25 14:36 | 27 518-0 28 894-9 
4 22 0 | 25 23.93 2 486-7 3 781-0 30 15-84 | 32 522.1 Be 892-6 
4 23 0 32-13 2 469-6 3 771-8 | Oct. 26 6 0 19-26 2 498-8 3 920-7 
Birizar. k=0:0001205. Batance. k=0-000013 approximately. 
9 D O°. 2, o, o, 
Buuance tumeounens,} Sephist rn, (929, rse am, (E208; 19e ans, (S29. ot aa am, {989 
