380 
MR. CHRISTIE ON THE MAGNETICAL OBSERVATIONS 
needle No. II. in each position of the instrument, and the resulting mean values of 
the angles '6 and ft. 
Observations for the Dip at Fort Reliance with the Needle No. II. 
Date. 
Time. 
Them. 
Face of th 
to the face of instrument. 
e needle 
reversed. 
Mean values. 
Face of instrument 
Face of instrument 
East. 
/. 
West. 
'6. 
East. 
'0. 
West. 
/• 
'6. 
1833. 
Oct. 9- 
1834. 
May 21. 
h m 
f 2 15 P.M. ~1 
[_ 5 40 P.M. J 
j 3 30 P.M. b 
[ 6 45 p.m. j 
O 
39 
49-6 
0 / 
84 17 
83 55-5 
n 1 
86 42 
86 10 
86 35 3 
86 8 
O / 
81 21-5 
81 59 
86 38 45 
86 9 0 
O 1 II 
82 49 15 
82 57 15 
Means of the two sets of] 
observations J 
86 23 53 
82 53 15 
Taking 84° 1' as the dip at Fort Reliance, substituting this for 3, and the values in 
the preceding Table for '6 and ft, in the equation (5.), we obtain y = 16° 29' 19". By 
means of this value of y and the observed values of '6 and ft, the value of 3, or the dip, 
is determined at the several stations at which observations were made with the needle 
No. II., assuming that the position of the axis of the needle was permanent in all 
these observations. The following Table contains : the means of Captain Back’s ob- 
servations of the direction of the needle, five being made in each position of the instru- 
ment, and both the lower and upper reading of the needle being registered ; the 
deduced mean values of '6 and ft ; and the value of 3, or the dip, determined by sub- 
stituting these mean values of '0 and ft, and the above value of y in the equation (5.). 
Place of observation. 
Latitude 
North. 
Longitude 
West. 
Date. 
Observed dip 
Face of t) 
to face of instrument. 
of the needle. 
ie needle 
reversed. 
Mean values. 
Deduced 
value of 3 
or dip. 
Face of instrument 
Face of instrument 
East. 
A 
West. 
'0. 
East. 
'0. 
West. 
A 
'6. 
/• 
1833. 
New York 
40 42 7 
74 i 15 
April 1. 
72 24-7 
7 0 28-7 
0 / 
76 47 
i6 lb’ 
O / // 
73 37 51 
72 50 21 
72 49 18 
Montreal 
45 29 34 
73 42 27 
April 19. 
77 12 
78 28 
78 58 
76 36-4 
78 43 00 
76 54 12 
77 6 27 
Fort Alexander 
50 36 49 
96 21 25 
June 10. 
78 56-25 
79 46-25 
80 12-9 
78 24-4 
79 59 35 
78 40 19 
78 53 37 
Cumberland House 
53 57 33 
102 21 46 
July 6. 
79 00 
82 21 
83 26-25 
78 27-5 
82 53 37 
78 43 45 
79 29 59 
Isle a la Crosse 
55 25 25 
107 54 36 
July 17. 
79 45 
82 2-9 
82 40 
77 53-5 
82 21 28 
78 49 15 
79 28 24 
Fort Cbipewyan ... 
58 42 32 
111 19 00 
July 31. 
80 27 
82 38-5 
84 14-5 
80 6-5 
83 26 30 
80 16 45 
81 00 39 
Fort Resolution .. 
61 10 26 
1 13 45 00 
Aug. 9. 
81 38-5 
85 11-5 
85 29-5 
80 7-5 
85 20 SO 
80 53 00 
82 3 9 
r 
Oct. 9. 
84 17 
86 42 
86 35-5 
81 21-5 
86 38 45 
82 49 15 
84 3 19 
Fort Reliance 
62 46 29 
109 0 39 4 
1834. 
1 
May 21. 
83 55-5 
86 10 
86 8 
81 59 
88 9 00 
82 57 15 
83 58 14 
Musk-Ox Rapid ... 
64 40 51 
108 8 10 
July 2. 
85 10 
87 36-25 
87 35-6 
84 28-75 
87 35 56 
84 49 23 
85 53 32 
Rock Rapid 
65 54 18 
98 10 7 
July 23. 
85 27 
89 41 
89 40-5 
86 49 
89 40 45 
86 8 00 
87 39 34 
Point Beaufort 
67 41 24 
95 2 16 
July 31. 
86 2 
89 24-5 
89 45-5 
87 39 
89 35 00 
86 50 30 
88 3 15 
Montreal Island ... 
67 47 27 
95 18 15 
Aug. 2. 
86 0 
89 19 
88 14 
87 25-5 
88 46 30 
86 42 45 
87 35 49 
Point Ogle 
68 13 57 
94 58 1 
Aug. 12. 
89 28-5 
91 45-5 
88 56-5 
87 34 
90 21 00 
88 31 15 
89 24 12 
Fort Reliance 
Oct. 9. 
84 2 
86 30-5 
86 27 
83 1-5 
86 28 45 
83 31 45 
84 31 24 
In this and subsequent Tables I have given the results to the nearest second ; not 
