EXTRA: OBSERVATIONS OF MAGNETOMETERS, JULY 2, 3. 1842. 55 
DECLINATION. BIFILAR. BALANCE. DECLINATION. BIFILaR. BALANCE. 
ee Min Reading Min. Reading Min. Reading ee Min Reading Min. | Reading Min. Reading 
of Reduced. of Cor- of Cor- of Reduced. of — Cor- of Cor- 
Obs. Obs.| rected. Obs.| rected. Obs. Obs.| rected. Obs.| rected. 
ah m. ¢ m. Se. Div. m. | Mic. Div. id he m. fj m. Se. Div. m. Mie. Div. 
July 2 10 | 48 | 123-27 48; 346 | July 2 12 || 30; 110-85 | 30 498 
50 | 122-33 | 50 | 374-4 || 51 354 | 32 | 113-60 | 32 517-2 | 33 479 
52 | 118-97 | 53 | 424-5 | 34 | 117-57 | 35 | 506-5 
54 | 116-77 | 54 327 36 | 120-32 | 36 | 482 
| 56 | 115-88 || 56 | 419-4 || 57 310 38 | 119-38 | 38 | 494.2 || 39 509 
58 | 116-70 | 59 | 423-9 40 | 117-57 || 41 | 500-0 
July 211] 0] 116-77 0 287 42 | 119-03 42 500 
2] 119-12 | 2] 423-4 3 267 44 | 121-12 | 44 | 500-9 || 45 489 
4 | 123-33 ] 5 | 422.6 46 | 124.48. 47 | 478.8 
6 | 128-17 6 244 48 | 121-38 48 520 
8 | 130-05 || 8 | 413-5 9 265 50 | 114-55 | 50 | 487-1 || 51 529 
10 | 129-85 || 11 | 417-2 52 | 114-00 | 53 | 491-4 
| 12 | 128.23 12 274 54 | 110-78 54 516 
| 14 | 128-77 || 14 | 432.4 || 15 294 56 | 109-65 | 56 | 495-8 || 57 497 
| 16 | 127-57 || 17 | 458-8 58 | 110-78 | 59 | 503-4 
18 | 127-50 18 307 | July 2131) 0| 109-85 0 488 
: | 20 | 129-23 || 20 | 463-6 || 21 313 2! 109-92 
| 22 | 129.23 || 23 | 458.2 
24 | 130-72 24 321 | July 3 19 58 523 
: 26 | 132-53 || 26 | 405-8 | 27 303 | July 3 20] 1 132-20 || 2] 443-6 
, 28 | 128-70 || 29 | 390.7 6 | 136-82 || 7 | 443-4 8 551 
30 | 126-22 30 | 292 (441-7) 
4 32 | 121-58 || 32 | 390-9 || 33 315 9 | 140-98 | 10 | 439-6 }} 11 564 
34 | 118-70 || 35 | 406-8 12 | 133-27 || 13 | 435-9 || 14 560 
36 | 122.60 36 301 (434-7) 
38 | 131-32 +] 38 | 410-2 | 39 220 15 | 136-42 || 16 | 435-0 || 17 558 
40 | 138-43 | 41 | 392-1 (434-0) 
42 | 139-58 42 156 18 | 136-15 | 19 | 430-3 || 20 560 
44 | 142.92 || 44 | 355-2 || 45 109 428-9 
46 | (147-83 || 47 | 288.7 21 | 136-95 || 22 | 422-9 || 93 538 
48 | 150.28 48 74 24 | 139-58 || 25 | 422-9 || 26 533 
50 | 139-98 | 50 | 293-3 |) 51 177 (426-0) 
| ‘| 52 | 113-33 |] 53 | 396-5 27 | 135-62 | 28) 430-6 || 29 524 
| 54 | 108-23 54 119 (432-8) 
| 56 | 118-43 || 56 | 442.2 || 57 128 30 | 137-15 | 31 | 417-8 |] 32 521 
| 58 | 116-77 || 59 | 486-3 (416-8) 
[July 212] 0} 115-82 0 165 33 | 138-03 || 34 | 420-3 || 35 532 
2| 126-82 | 2] 513-6 3 194 < || 36! 141-60 | 37 | 430-8 | 38 548 
4} 134-75 | 5 | 502-5 : (428-1) 
; 6 | 140-12 6 264 39 | 139-32 || 40 | 422-7 || 41 565 
; 8 | 133-13 || 8 | 481-0 9 369 | (420-4) 
| 10 | 124-48 | 11 | 486.2 42 | 136-48 | 43 | 414-3 || 44 561 
12 | 118-83 12 386 (415-5) 
; 14) 120-52 || 14 | 482-2 | 15 392 45 | 138-10 || 46 | 424-5 || 47 551 
16 | 116-77 | 17 | 515-7 (425-5) 
\ 18 | 113-80 18 426 48 | 136-75 | 49 | 424-1 | 50 538 
| 20 | 108-78 | 20 | 530-3 | 21| 472 (425-9) 
| | 22 | 106-63 || 23 | 553-9 51 | 134-60 | 52} 416-0 || 53 541 
| 24 | 110-52 4 463 (413-5) 
| 26 | 115-62 | 26 | 537-9 | 27 488 54 | 136-48 || 55 | 417.2 || 56 552 
| 28 | 112-53 | 29 | 527-1 (410-6) 
| 
Balance Thermometer. 
Ares of Vibration. 
1 Declination Magnet. 
4 20" 54™, 13’. Bifilar Magnet. July 24 11» 23m, 10div; 1 
734 20h 25m, 17aiv ; 20h 2m, Q2div ; BOh Z1m, 1Odiv; 2Oh 4m, 15dir; QOn 4gm, O4aiv 
| 
| 
Tuly 24 12h 93m, 
See note, page 51, on the observations in brackets. 
| 
f 
r 
|| 
Reading of Uifilar estimated, Scale going out of field. 
q July 34 204 Om, The following are the readings of the Declination 18* before and 185 after the minute, 
haying been lost, 19 59™ 42s, 1168; 20% Om 18s, 1276. 
Bifilar Thermometer. July 2411», 60°1; 12%, 59°7 ; 18h, 59°2; 34 20h, 564, 
July 24 114, 637-3; 12h, 62°2; 13h, 61%1; 
July 24 10% 48m, 7/ 
34 20h, 567-4, 
; 10% 50™, 8%; 11» 50™, 10’; 114 52m, 9’; 34 20 12m, 8’; 20h 48m, 9’: 
1h 41m (21div down); 11% 43m (424iv up); 114 59m, 10div; 12h 11m, 1Qaiv. 
20h 52m, 1Gdiv ; 20h 55m, 354ir (noted). 
the reading at the minute 
