Extra OBSERVATIONS OF MAGNETOMETERS, APRIL 13—18, 1845. 105 
Gott. BIFILAR BALANCE Gott. BIFILAR || BaLANcr 
Pes. Mean DECLINATION. Corrected. Corrected. Mean DECLINATION. Corrected. ( roreeered, 
Time, Time. 
Min. |Mic. Div.) d. oh. || Min} ° = ¢ Min. | Sc. Diy. |} Min. | Mic. Div] ad. oh. || Min.}| ° Min. | Sc. Div. |] Min. } Mie. Div. 
13 15 29 | 591-3 14 6 || 20 |,25 11-68] 22 | 549-3]; 23 | 621-1 
33 83-0 *!| 30 | 24 53-17]) 32 | 559-3 || 33 | 267-6 30 09-79 || 32 | 550-0} 33 | 622-7 
34 | 539-0 45 07:81 | 47 | 535-8 || 48 | 624-0 
35 48-36 || 37 | 519-9] 38 | 251-9 55 04:12) 57 | 541-0]) 58 | 630-4 
38 | 155-7 39 | 525-0 4% 0 | 25 00-57|) 2 | 543-8|| 3 | 633-7 
40 45-04 10 | 24 57-04) 12 | 555-9) 13 | 624.3 
41 45-20 || 42 | 525-7]! 43 | 266-0 15 | 24 59-36] 17 | 564-6) 18 | 618-8 
43 | 213-6 44 | 516-4 25 | 25 03-48} 27 | 556-0) 28 | 612-5 
45 43-89 || 473) 505-9 || 483) 280-8 50 07-81 || 52 | 536-8 || 53 | 599-1 
50 44-19 || 52 | 508-9) 53 | 299-0] 14 8 0 06-74|| 2 | 536-7)| 3 | 593-3 
48 | 224-5 54 | 515-4 35 10-06 || 37 | 533-4|| 38 | 576-9 
55 45-07 || 57 | 521-5] 58 | 317-4] 14 9 0 11-64 || 2 | 531-7]| 3 | 570-8 
59 | 525-2 14 11 0 12-36] 2 | 530-3] 3 | 512-1 
53 | 224-84 13 16 0 47.19|| 2 | 528-0] 3 | 288-6 30 12-78 || 32 | 529-0|| 33 | 501-7 
* 5 49-57 || 7 | 526-1 8 | 369-5] 14 12 0 16-43 || 2 | 531-1 3 | 470-5 
10 50-18 | 12 | 519-8]) 13 | 392-7 11 15-56 || 12 | 531-2|| 13 | 469-8 
15 | 24 57-24) 17 | 517-6] 18 | 403-9 20 14-40 || 22 | 530-2); 23 | 471-0 
20 | 25 00-20 | 22 | 519-6]) 23 | 412-6 30 12-38 || 32 | 530-9} 33 | 475-1 
30 02-32 || 32 | 518-2]) 33 | 434-2] 14 13 0 12-55 2 | 535-2)) 3 | 483-5 
40 02-66 || 42 | 526-1 ]) 43 | 443-0 —|——|——— : 2 
45 08-36 || 47 | 514-9] 48 | 441-91 15 9 0 | 25 02-99|| 2 | 549-9|| 3 | 540-2 
50 07-78 || 52 | 509-2]| 53 | 441-4 25» 06-66 || 27 | 543-6|| 28 | 535-3 
13 17 0 | 25 06-46) 2 | 524-5] 3 | 448-27 15 10 0 07-57 || 2 | 539-9|| 3 | 532-9 
10 | 24 58-42] 12 | 525-3]! 13 | 455-0 =|} | —_-——+*- | 
14 | 530-8 18 8 0 | 25 08-32)| 2] 543-9] 3 | 593-6 
15 | 25 00-80] 17 | 525-3] 18 | 457-7 16 04-68 || 17 | 536-3]| 18 | 608-0 
22 | 534-2] 23 | 459-1 20 03-84 || 22 | 535-6 || 23 | 611-2 
25 | 24 59-01) 27 | 538-8 || 28 | 464-4 25 05-15 || 27 | 540-4|| 28 | 610-9 
35 | 25 04-10) 3 535-3 || 38 | 476-3 30 04-69 || 32 | 548-9 || 33 | 604-1 
45 02-96 || 47 | 540-1 ]) 48 | 487-1 35 07-81 || 37 | 547-3 || 38 | 594.9 
55 03-09 || 57 | 533-4] 58 | 493-3 40 09-84 || 42 | 541-8 )) 43 | 583-3 
13 18 0 02-99] 2 | 537-0] 3 | 499-9 45 08-95 || 47 | 539-1 || 48 | 579-6 
10 05-09 || 12 | 536-8 || 13 | 506-5 55 05-63 || 57 | 530-6|| 58 | 577-3 
20 07-78 || 22 | 532-0] 23 | 511-0} 18 9 0 03:50) 2 | 531-7|| 3 | 574-2 
13 19 0 07-38 || 2 | 531-0) 3 | 518-5 5 01-93 || 7 | 532-2]) 8 | 570-7 
15 05-00 | 17 | 530-0} 18 | 517-1 10 | 25 00-38 }| 12 | 535-4 || 13 | 567-0 
13 20 0 03-23 || 2 | 539-8] 3 | 509-6 15 | 24 59-32} 17 | 537-5]) 18 | 563-1 
10 09-35 | 12 | 532-0] 13 | 514-6 20 | 25 00-10]) 22 | 537-4 |) 23 | 559-0 
20 08-31 || 22 | 533-5 |) 23 | 519-4 35 01-68 || 37 | 531-0)) 38 | 549-6 
13 21 0 06-59) 2 | 522-7|) 3 | 523-7 40 02-35 || 42 | 529-5 |) 43 | 549.6 
45 02-25 || 47 | 529-2|| 48 | 549-4 
14 °2 0 | 25 20-69|| 2 | 517-6] 3 | 560-8 55 01-68 || 57 | 533-1)) 58 | 548-1 
30 20-29 || 32 | 529.0|| 33 | 564-9} 18 10 0 01-59 || 2 | 533-1 3 | 546-6 
14 3 0 20-50 || 2 | 533-1 3 | 569-1 15 03-90 || 17 | 530-8|| 18 | 550-3 
14 4 0 14-50|| 2 | 538-6|} 3 | 650-6} 18 11 0 08-80 |} 2 | 538-0)) 3 | 550-6 
10 08-99 || 12 | 556-3] 13 | 667-24 18 13 0 10-16) 2 | 539-7) 3 | 539-1 
15 03-20 || 17 | 571-5] 18 | 669-8 10 18-38 || 12 | 542-7} 13 | 527-8 
20 05-79 || 22 | 581-2] 23 | 667-7 15 15-98 || 17 | 546-5 || 18 | 511-7 
25 10-83 || 27 | 569-4 | 28 | 665-6 21 12-29 || 22 | 550-4 || 23 | 497-6 
30 15-71 || 32 | 546-6|| 33 | 654-7 25 10-11 || 27 | 552-1 || 28 | 489-8 
35 17-02 || 37 | 544-7] 38 | 643-2 30 08-79 || 32 | 553-0] 33 | 482-5 
40 17-71 || 42 | 539-6 || 43 | 633-5 35 09-03 || 37 | 549-1 || 38 | 478-5 
45 17-80 || 47 | 537-5 || 48 | 625-4 40 08-92 || 42 | 544-2]) 43 | 476.4 
50 17-80 || 52 | 538-7 || 53 | 617-4 45 08-12 || 47 | 538-6) 48 | 476-1 
14 5 0 16-87 || 2 | 541-8] 3 | 603-5 50 07-15 || 52 | 536-4|| 53 | 475-6 
10 16-80 | 12 | 538-2|) 13 | 600-4) 18 14 0 07-89 || 2 | 536-2|| 3 | 477-7 
40 18-23 || 42 | 562-8) 43 | 587-3 30 03-16 || 32 | 535-5|) 33 | 476-0 
50 18-20 || 52 | 556-2|| 53 | 598-6) 18 15 0 00-94 || 2) 525-1 3 | 482-0 
55 14-91 || 57 | 546-1) 58 | 610-0 10 00-91 || 12 | 524-0) 13 | 487-7 
14 6 0 11-59] 2 | 543-5] 3 | 619-8 20 01-61 || 22 | 522-4|) 23 | 492-9 
10 11-30 || 12 | 555-9] 13 | 618-6 30 02-05 || 32 | 524-1 || 33 | 496-8 
Birivar. k=0:000140. BALANCE. k—=0-000010. 
F See notes on the Aurora Borealis, after the Extra Observations of Magnetometers. 
ril 134 144 57m 30s, The horizontal component diminished rapidly, and the bifilar scale went out of the field of the reading telescope. 
il 134154 0™, The arms of the bifilar torsion circle were turned through 1° 12/; they were turned at 15» 46™ to within 9/-5 of their 
nal position, and at 21" 30™ to their original position: all the observations made between 15 0™ and 21" 30™ have been corrected to the 
lormal reading of the torsion circle. See Introduction, p. xxxii. 
AND MET, ogs. 1845. 2D 
