310 
MAGNETIC SURVEY IN NORTH AMERICA. 
Table XLI. 
Absolute Horizontal Force deduced from the times of vibration of Nos. 30 and 31 
in 1843. 
Station. 
Date. 
Magnet. 
Time of 
vibration. 
s. 
Magnetic Horizontal force in 
moment. absolute measure. 
Isle a la Crosse 
Buffaloe Lake 
River de la Loche 
Portage de la Loche 
Clearwater River 
Pierre au Calumet 
Pointe Brulee 
Athabasca 
Sept. 9* 
13. 
14. 
16 . 
19- 
20 . 
21 . 
Oct. 13. 
f 30 
131 
/ 30 
131 
r 30 
131 
r 30 
131 
r 30 
131 
r 30 
131 
r 30 
131 
/ 30 
131 
4-6589 
4-8838 
4-7694 
4-9986 
4-7101 
4-9345 
4-7725 
4-9968 
4- 7822 
5- 0201 
4- 8867 
5- 1162 
5-0054 
5-2482 
5-0514 
5-2816 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
•4138 
•3841 
2-4031 
2-386 / 
2-283 1 
2-273 / 
2-341 1 
2-332 f 
2-394 
2-278 
2-336 
“!}w 
si Is } 2 - 262 
2 ' 175 1 2-172 
2-170/ 7 
2 ' 073 t 2-067 
2 - 062 / ^ Ub7 
2-035 1 6 
2-036 / ~ U3b 
Table XLII. 
Times of Vibration of Nos. 30, 31 and 17, between August 22 and October 13, 
recorded but not employed. 
Station. 
1843. 
No. 30. 
No. 31. 
No. 17. 
Station. 
Date. 
No. 17. 
Cumberland House .... 
Beaver Lake 
Portage des Epinettes . . 
Frog Portage 
Great Devil Portage .... 
Pine Portage 
Snake Rapid 
Portage Sonnante 
Aug. 22. 
26. 
28. 
29. 
Sept. 1. 
3. 
4. 
7. 
4-667 
4-689 
4-786 
4-765 
4-786 
4-760 
4-644 
4- 945 
5- 007 
5-049 
4- 937 
5- 011 
4-983 
4-879 
5-126 
5-205 
5-272 
5-318 
5-286 
5-231 
5-097 
Isle a la Crosse 
Buffaloe Lake 
River de la Loche 
Portage de la Loche .... 
Clearwater River 
Pierre au Calumet 
Pointe Brulee ,, 
Sept. 9- 
13. 
14. 
16. 
19. 
20. 
21. 
5-116 
5-236 
5-169 
5-231 
5-253 
5-364 
5-493 
Collecting then in one view the results obtained by Lieut. Lefroy with the magnets 
of the German and unifilar magnetometers, and employing the Inclinations observed 
at the stations which will be found in the general table at the close of § 12, we have 
the values of the horizontal component, and of the total Force, severally as follows : — 
a. signifies by the German magnetometer ; b. by the unifilar, where both deflections 
and vibrations have been observed ; and c. when the times of vibration only of the 
magnets of the unifilar were observed. 
