284 
MAGNETIC SURVEY IN NORTH AMERICA. 
Table XXVI. 
Observations on the Magnetic Force at Stations in Canada, with Lloyd’s Needles 
L. C. and L. D., in October and November 1845, by Lieut. Lefroy, R.A. 
Station. 
1845. 
Needles. 
Mean angle of 
deflection. 
Thermo- 
meter. 
Oct. 17. 
c. 
-17 22-7 
O 
49 
17. 
c. 
— 17 22-8 
50 
Nov. 3. 
c. 
-17 41-9 
47 
3. 
c. 
— 17 28-2 
48 
3. 
c. 
-17 40-8 
50 
Mean . . 
c. 
— 17 31-3 
49 
Oct. 17- 
D. 
-14 17-6 
49 
17. 
D. 
— 14 24-9 
50 
Nov. 3. 
D. 
-14 15-1 
55 
3. 
D. 
-14 18-6 
49 
Mean . . 
D. 
— 14 19-0 
50 
Oct. 18. 
c. 
-19 36-7 
55 
18. 
D. 
-16 28-8 
59 
20. 
C. 
—20 19-0 
44 
20. 
D. 
-17 18-9 
44 
22. 
C. 
-19 09-1 
54 
22. 
D. 
— 16 25-3 
49 
23. 
C. 
—20 23-9 
54 
23. 
D. 
— 16 53-2 
55 
25. 
C. 
-18 34-2 
55 
27. 
C. 
-18 52-5 
68 
25. 
D. 
— 15 52-6 
57 
27. 
D. 
— 15 44-8 
68 
28. 
C. 
-18 36-5 
69 
29. 
C. 
— 18 38-7 
58 
28. 
D. 
— 15 30-0 
75 
29. 
D. 
— 15 14*6 
58 
Inclination. 
Intensity. 
Toronto = 1-836. 
Remarks. 
Toronto ....<; 
75 14-3 
1-836 
>Base station. 
75 14-3 
1-836 
Niagara . . . . | 
Buffaloe . . . . | 
Amherstburg. | 
Detroit .... | 
Port Sarnia . . 
Goderich . 
74 46-8 
1-822 
In a field near the Falls. 
74 37-0 
1-814 
lj mile distant from the Lake. 
73 30-0 
1-822 
Garden of the Hon. J. Gordon. 
73 38-8 
1-814 
J Corner of Lafayette and 
[ Orleans Streets. 
74 15*8 
1-825 
Garden near the Ferry. 
75 48-0 
1-828 
Garden at the foot of the Hill. 
Corrections have been made for the variations of temperature. 
Table XXVII. contains the several determinations with the statical needles of 
Lloyd and Fox collected in one view, and exhibits a mean of the several statical 
determinations at each station. 
