EXTRA OBSERVATIONS OF MAGNETOMETERS, May 16—Juny 1. 1842. 51 
DECLINATION. BIFILAR. BALANCE. DECLINATION. BiFivar. BALANCE. 
Mean Tene. |™0-| pending |Mim-| Reading | Min.| Reading dean Tine. |™2-| Reaaing | Miz-| Reading || Min.| Reading 
Reduced of Cor- of Cor- of Retnnen: of Cor- of Cor- 
Obs. * | Obs.| rected. ||Obs.| rected. Obs. Obs.| rected. || Obs.| rected. 
a =h | m A m. Se. Div. m. Mice. Div. dh. |} m. z m. Se. Div. 1m. Mic. Diy. 
May 16 4 58 998 May 25 5 | 27! 132-13 | 26 557-3 
May 16 5 0} 149-71 2 574:3 29 554-8 
13 | 144-42 | 15 554.3 14 1055 30 556-6 
16 | 141-93 | 18 549-1 17 1069 34 553-6 
19 |} 139-72 || 21 546-7 || 20 1072 
22 | 139-38 || 24 544-9 || 23 1077 July 1 19 58 618 
25 | 137-37 || 27 549-4 || 26 1074 July 1 20 0 | 126-42 2 479-8 
28 | 134-53 || 30 551-5 29 1056 6 | 118-63 i 495-2 9 634 
31 | 134-60 || 33 552-3 32 1042 10 | 122-33 || 11 513-5 12 634 
34 | 134-82 || 36 554-9 || 35 1031 13 | 125-22 || 14 517-3 15 635 
37 | 134-88 || 39 553-3 38 1022 16 | 125-48 || 17 507-2 
40 | 135-22 | 42 552-9 | 41 1015 18 | 123-40 || 19 488-2 | 20 655 
43 | 135-55 || 45 555-4 || 44 1008 | 21 122-73 || 22 472-4 23 666 
46 | 135-55 || 48 556-6 || 47 1003 24 | 121-52 || 25 456-1 26 678 
49 | 135-82 || 51 553-6 || 50 999 27 | 120-12 || 28 462-6 || 29 670 
52 | 135-15 || 54 555-1 53 995 (464-3) 
55 | 134-33 || 57 555-4 || 56 989 30 | 119-85 || 31 473-1 32 661 
[ 58 | 134-33 | 60 554-8 || 59 984 (474-8) 
May 16 6 1 | 134-20 3 556-0 2 980 33 | 119-18 || 34 491-5 | 35 655 
4 | 134-13 6 | 558-3 5 975 36 | 117-37 || 37 | 499-6 || 3S 654 
: 7 | 135-08 9 558-9 8 970 (503-3) 
. 10 | 135-62 |) 12 559-8 11 967 39 | 113-93 |) 40 509-1 41 651 
13 | 136-68 || 15 560-3 14 964 (506-4) 
16 | 136-88 || 18 558-3 17 962 42 | 106-55 || 43 489-1 44 672 
19 | 137-37 || 21 557-3 || 20 960 (487-5) 
22 | 137-30 || 26 555-4 || 24 958 45 | 120-45 || 46 485-1 47 698 
28 | 137-57 || 31 550-7 || 29 957 (484.5) 
33 | 137-15 || 39 548-0 || 36 951 48 | 128-03 || 49 467:8 50 701 
42 | 136-02 || 48 548-5 || 45 941 51 119-45 52 703 
51 | 136-02 || 57 556-1 54 932 54 | 126-15 |) 55 464-8 | 56 716 
May 16 7 0 | 136-35 6 555-5 3 928 57 | 133-67 || 58 459-0 59 721 
y 9 | 136-35 | 15 556-9 12 922 July 1 21 0 | 130-78 1 443-6 2 720 
18 | 137-50 28 920 (445-1) 
40 549-0 3 | 124-07 4 435-7 5 714 
(430-2) 
May 24 7 || 30| 130-65 | 32 549-6 34 839 6 | 111-53 7 432-1 8 708 
May 24 8] 0| 130-45 | 2) 550-1 4 839 (433-6) 
‘ ; 9 | 110-12 || 10 455-6 11 707 
| May 25 2 54 | 135-28 | 55 | 546-0 | 56 | 823 456-6) 
i} 57 | 135-62 | 58 545-9 || 59 821 12 | 116-83 || 13 461-3 14 710 
May 25 3 0 | 135-02 1 547-3 || 2 819 15 | 114-42 || 16 439-5 17 718 
| 3 | 135-02 4 549-0 5 819 (436-3) 
| ! 6 | 134-82 7 547-9 18 | 115-35 || 19 460-5 || 20 733 
j 11 | 549-9 (462-7) 
} | 13 546-9 21 131-25 || 22 478-3 || 23 726 
( } | 16 | 544-7 (127-17) 
9 20 549-3 24 | 127-97 || 25 481-0 || 26 720 
| 26 | 134-33 | 24 548-8 || 25 816 (483-2) 
| 
Bifilar Thermometer. 
| | 20h, 58°-4 ; 214, 5870. 
! Balence Thermometer. May 164 5%, 64°-7 ; Gn, 65°83; 74, 65°7. May 244 7 30m, 56°7, May 254 3 
‘| 587-4, 
Ares of Vibration. 
h 20 24m, 10’; 20 27m, 7’, 
é few cases the are was noted at the time of observation. 
_ | readings exceeds 6’ for the Declination and 104 for the Bifilar. 
Declination Magnet. 
Bifilar Magnet. 
an extra reading having been made at 505, it is the mean of the readings at 0%, 255, and 505. 
the times of vibration of the Bifilar and Declination magnets respectively. 
May 164 54 1842, 67°-0; 6%, 677; 75, 67°-9. May 2447» 30m, 580. May 254 3h, 59°-5; 54, 6171. July 14 
, 581, 
July 14 20% 0m, 11/; 208 6™, 7’; 20h 13m, 8’; 208 16m, 15’; 208 18™, 17’; 204 21m, ni 
July 14 204 2m, (224iv up) ; 21 4m, L4aiv; Q]h 7m, 1Bdiv, 
The ares of vibration given above are taken from the reas as registered, and are therefore generally less than the truth; ina 
The are has not been given excepting when the difference of two consecutive 
- When the readings of the Bifilar do not shew a vibration but a progressive 
, motion, the quantity moved in 505 is given in brackets with up or down attached as the reading was increasing or diminishing. 
' July 1444, When an observation of the Bifilar is given in brackets (_), it is the mean position 255 after the previous observation ; 
The observations of Declination in brackets 
are the mean positions “18° before the succeeding observation, obtained by making a reading 36% before the minute. 25% and 18* being 
July 14 208, 58°°7; 214, 
