OBSERVATIONS OF THE MAGNETIC FORCE. 
295 
“ The following were the mean values of -jr so obtained : — 
With stirrup. Without stirrup. 
No. 30. -0022 -00024. 
31. -0028 -00030. 
1 7. -00031. 
“ From the above mean values at Toronto, an approximate value has been obtained 
fJV2 
for each of the other stations by multiplying them by the ratio -?p~ at each station. 
Thus the value applied at Fort Good Hope for the vibration in the stirrup, was for 
bar 30, ’0046, and for bar 31, *0058. 
“ Table XXXVIII. contains the particulars of all the experiments by which a com- 
plete determination of the absolute horizontal force was made ; these have been 
corrected for the various circumstances referred to ; and in Table XXXIX. the 
data are given which have been employed for the corrections in each experiment. 
Table XXXIX. is followed by a notice of such additional circumstances at any of the 
stations as may seem to require explanation. 
Table XXXVIII. 
Exhibiting the corrected data of each experiment for determining the Absolute 
Horizontal Force. The letter s affixed to the time of vibration signifies that the 
bar was suspended in the stirrup. 
Date. 
Station. 
Bar. 
Angles of 
deflection. 
Time of one 
vibration. 
Values 
of m. 
Values of X. ; 
Nov. 4, 1844. 
4, 1844. 
4, 1844. 
4, 1844. 
4, 1844. 
May 31, 1843. 
31, 1843. 
Sault St. Mary .... 
Sault St. Mary .... 
Sault St. Mary .... 
Sault St. Mary .... 
Sault St. Mary .... 
Fort William 
30 
30 
31 
31 
17 
30 
13 52*5 
6 23-8 
12 22-0 
5 42-1 
12 24-8 
17 01-7 
7 47-6 
15 39-8 
7 10-4 
s. 
| 4-2527 
| not observed 
4-7196 
) 4-9311 (s.) 
0-394 
0-394 
0-639 
0-455 
3-030 
3-028 
3-030' 
3-033 
3-039 
2-868’ 
3-029 
^ 3-031 
3-039 
> 2-869 
>3-032 
Fort William 
30 
0-455 
2-871 
31, 1843. 
Fort William 
31 
j 5-1537 O) 
0-420 
2*870 1 
. 2-872 
31, 1843. 
Fort William 
31 
0-419 
2-874 J 
Oct. llj 1844. 
Fort William 
30 
14 42-7 
6 47-1 
j 4-3471 
0-396 
2-880] 
2-880 
!>2-879 
11, 1844. 
Fort William 
30 
0-396 
2-880 J 
ll’ 1844. 
Fort William 
31 
13 00*9 
6 01-0 
j 4-6387 
0-352 
2-8821 
2-878 
ll’ 1844. 
Fort William 
31 
0-353 
2-874 J 
11, 1844. 
Fort William 
17 
13 13-0 
4-8517 
j 4-7821 
0-640 
2-862 
2-862 
June 14, 1843. 
Fort Francis 
30 
15 59-3 
0-455 
3-0491 
3-048 
14’ 1843. 
Fort Francis 
30 
7 21-4 
0-456 
3-046 J 
14, 1843. 
Fort Francis 
31 
14 38-0 
j 5-0102 
| 4-2395 
0-418 
3-0511 
3-049 
3-031 
14, 1843. 
Sept. 29, 1844. 
29, 1844. 
Fort Francis 
Fort Francis 
31 
30 
6 45*1 
13 55-6 
0-418 
0-396 
3-047 J 
3-0341 
>3-041 
Fort Francis 
30 
6 26-4 
0-397 
3-027 J 
2 q 2 
