108 EXTRA OBSERVATIONS OF MAGNETOMETERS, JuLY 24—Aueust 4, 1845. = 
Gott. BIFILAR BALANCE Gott. BIFILaR BALANCE Gott. 
Mean DECLINATION, Gorrectad® Gorractad. Mean DECLINATION. Gorredtad. Gorrected: Mean DECLINA’ 
Time. Time. Time. 
a Oh. | Min. os 4 Min. | Se. Div. |} Min. | Mic. Div. ak Min. eo %, Min. | Se. Div. || Min. | Mic. Div. da. oh, Min. oY 
24 11 | 20 | 25 09-10 || 22 | 538-1 |) 23 | 479-5] 24 20 0 | 25 16-82 2] 518-9 3 | 350-9 1 11 || 10 | 24 53.6 
2412| O 07-55} 2 | 5338-1 3 | 476-0 10 18-40 || 12 | 517-8 || 13 | 355-0 15 54: 
24 13 0 | 03-30) 2 | 536-0 3 | 459-4 20 19-04 || 22 | 520-3 || 23 | 360-5 20 | 24 57. 
| 15 | 25 03-23 || 17 | 531-2]) 18 | 450-5 30 17-53 || 32 | 525-7] 33 | 361-4 25 | 25 00.2 
24 14) O| 24 54-26 | 2 | 523-5 3 | 405-0f 40 19-49 || 42 | 518-2]) 43 | 368-0 30 03-2 
10 | 24 58-58) 12 | 520-3]} 13 | 394-9 50 14-50} 52 | 511-7}! 53 | 375-4 40 10-4 
| 15 | 25 00-84 || 17 | 521-9 18 | 386-0} 24 21 0 16-53 2 | 514-3|| 3 | 382-2 f 50 10-5 
20 02-17 | 22 | 529-9]| 23 | 377-9 15 14-13 |] 17 | 512-8|| 18 | 388-1 1 12 0 06. 
Weed) 02-57 || 27 535-5 || 28 | 367-4 32 17-36 || 33 | 513-0 || 34 | 396-2 10 06-2 
| 30 | 02-48 || 32 | 530-0 ]| 33 | 359-8] 24 22 0 20-33 2 | 516-9 3+} 398-8 20 07: 
| 35 01-38 || 37 | 524-0]| 38 20 17-46 || 22 | 503-9 || 23 | 412-2 30 07-0 
| 40 | 25 00-67 | 42 | 521-3 || 43 25 17-96 || 27 | 505-9 || 28 | 414-6 40 05-1 
45 | 24 58-62) 47 | 518-7 || 48 40 18-43 || 42 | 503-3 || 43 | 428-5 50 03-0 
50 56-50 || 52 | 514-4) 53 | 24 23 0 18-60 2 | 500-4|| 3 | 437-3 113 0 02.2 
55 54-95 || 57 | 520-7] 58 15 19-17} 17 | 497-9 || 18 | 442-3 10 05.2! 
24 15 0 55-78 2 | 527-2 3 | 328-1 30 22-84 || 32 | 499-5 || 33 | 451-1 25 09.4 
5 56-63 7 | 529-0 8 | 322-8] 25 0 0 18-81 2 | 505-7 | 3 | 451-2 35 10. 
} 10 | 24 57-61) 12 | 531-7} 13 | 318-5 32 | 510-5 || 33 | 457-9 50 155 
15 | 25 00-27 |) 17 | 536-2] 18 | 314-4 35 18-67 | 1 14 0 18-3 
| 20 03-35 || 22 | 538-2]) 23 | 312-0] 25 1 0 17-65 2 | 529-8 3 | 466-8 10 19-4 
25 09-3 27 | 546-0 |) 28 | 306-5 30 16-32 |} 32 | 535-3] 33 | 481-9 20 16-9 
| 30 13-05 || 32 | 554-2]| 33 | 295-3] 295 2 0 17-19 2 | 538-2 3 | 482-9 30 13-8 
3.5) 11-81 || 37 | 554-1 || 38 | 281-8 40 12.8 
40 07-57 || 42 | 548-4 | 43 | 275-5] 25 10 0 | 25 03-13 2 | 539-6 3 | 453-0 50 10:5 
45 07-40 || 47 | 550-6 || 48 | 273-4 10 02-99 || 12 | 543-6]| 13 | 448-3 115 0 10-0 
50 05-94] 52 | 551-9) 53 | 276-8 20 05-89 || 22 | 541-9} 23 | 447-6 20 12-9 
| 55 08-03 || 57 | 547-3 || 58 | 279-6] 25 11 0 08-58 2 | 534-7 3 | 446-1 45 08-4 
24 16 0 08-90 2 | 546-4 3 | 280-6] - — = — 1 16 0 03-7 
15 12-58 || 17 | 529-1]| 18 | 290-0 Lar? 0 | 25 23-88 2 | 558-7 3 | 458-7 10 02-2 
20 14-24 || 22 | 520-7 || 23 | 295-2 10 25-09 || 12 | 538-7 || 13 | 465-9 20 03. 
25 15-51 || 27 | 519-0) 28 | 296-3 25 26-74 || 27 | 521-8] 28 | 471-4 40 07-1 
30 16-55 || 32 | 517-5]! 33 | 293-8 30 28-04 || 32 | 526-0] 33 | 470-0 i ily 0 08.0 
| 35 16-41 || 37 | 515-4] 38 | 288-4 40 26-50 || 42 | 538-1|| 43 | 464-1 I 
40 16-26 || 42 | 510-0} 43 | 284.3 50 23-95 || 52 | 534-9 || 53 | 468-1 2 11 0 | 25 06:2 
45 17-73 || 47 | 506-5 || 48 | 285-2 eS 0 22-99 2 | 539-8 3 | 468-6 10 05-3 
a0 19-07 || 52 | 510-3) 53 | 291-5 10 21-64 |) 12 | 503-4] 13 | 481-4 30 10-( 
55 20-16 || 57 | 513-6]) 58 | 300-3 16 23-14|| 17 | 515-4) 18 | 480-4] 2 12 0 05-9 
24 17 0 21-56 2} 512.3 3 | 304-2 20 22-67 || 22 | 528-2}) 23 | 476-5 —|—| = 
5 24-33 GA\e512-1 8 | 302-1 25 21-97 || 27 | 540-9|) 28 | 474.2— 3 14 0 | 25 11-45 
10 27-15 || 12 | 514-3]) 13 | 298.2 30 21-46 || 32 | 550-4 ]| 33 | 473-7] 15 17 
15 29-90 || 17 | 525-3] 18 | 291-1 35 21-24|| 37 | 554-3 || 38 | 473.8 20 19-5 
20 29-26 || 22 | 535-6 || 23 | 283-8 40 21-12|) 42 | 559-8 || 43 | 475-3 25 20:5 
25 26:81 |) 27 | 527-7|) 28 | 278-2 45 21-68 || 47 | 558-0 || 48 | 479-7 30 21 
30 24-19 | 32 | 526-0) 33 | 274.4 50 21-24]| 52 | 560-8] 53 | 481-4 35 21.2 
35 23-34 || 37 | 525-2]| 38 | 274-7 55 21-50]! 57 | 557-2|) 58 | 484-2 40 214 
40 22.77 || 42 | 520-2] 43 | 277-2 1 4 0 20-55 2 | 555-5 3 | 488-1 45 20: 
45 24-52 || 47 | 522-9) 48 278-2 17 | 566-6 |) 18 | 493-7 50 18-5 
| 50 25-54 || 52 | 523-3, 53 | 280-0 35 22.80 |] 37 | 585-0]! 38 | 502-5 55 5. 
55 24-82)| 57 | 516-0] 58 | 281-6 47 | 564-5 || 48 | 525-67 3 15 0 14 
24 18 0 22-87 2 | 512.8 3 | 285-7 to 0 19-91 2 | 546-9 3 | 560-7 31 09: 
5: | 22-28 7 | 514-0 8 | 288-5 10 18-77 || 12 | 534-4]) 13 | 575-9] 3 16 0 07: 
15 20-89 || 17 | 513-4]| 18 | 289.3 20 19-37 || 22 | 543-8 |) 23 | 575-3] 3 20 0 09. 
40 18-30 |) 42 | 516-2]| 43 | 315-4 30 | 18-50 || 32 | 549-8 || 33 | 569-8 38 12. 
24 19 0 19-07 2 | 518-1 3 | 320-2 40 21:06 || 42 | 567-2]| 43 | 562-3] 3 21 0 12- 
10 | 19-04 || 12 | 514-9}) 13 | 322.7 || 50 20-201] 52 | 553-9|| 53 | 565-6 |__| 
15 | 18-20 || 17 | 512.4) 18 | 327-5 6 0 | 19-41 2 | 552-5 3 | 569-4) 4 3 0 | 25 15:1 
25 19-61 || 27 | 514-0 || 28 | 328.4 toa 16-68 || 17 | 535-2|| 18 | 576-9 Sith 16 
30 19-81 || 32 | 510-2]| 33 | 334-7 30 | 14-53 || 32 | 538-6|| 33 | 566-97 4 4 0 16- 
40 18-77 || 42 | 515-5 || 43 | 341-1 lew 7 O | 25 13-25 2 | 549-1 3 | 537-2 
50 17-22|| 52 | 508-1 |) 53 | 349-0 | 4 14 0 | 25 05: 
55 17-00 | 57 | 515-01 58 | 349-2 Det 5 | 24 54.01 6 | 551-8 7 | 408-9 30 05- 
Birirar. k=9:000140. BALANCE. k=0:000010. 
July 24° 14h lom. A very small insect climbing along one of the balance spider crosses ; length of the insect about 7 micrometer divisions, 0 
rather more than a thousandth of an inch. 
July 25*. The instruments slightly disturbed throughout the evening. 
