[JACKSON] MAGNETIC OBSERVATIONS IN CANADA 147 
METEOROLOGICAL SERVICE 
OF CANADA 
Form 6 
DECLINATION AND 
MAGNETIC OBSERVATIONS HORIZONTAL INTENSITY 
Deflections with Theodolite Magnetometer No. 15 Footscrew A B South 
Station : Ft. Smith. Date: Thur. June 2, 1910. Obs’r : W. E. W. J. 
Magnet 15 L Erect deflecting at right angles to Magnet 15 S Erect suspended. 
Cirele Readings 
= 
rs L i. Distance r — 25 cm. TE Distance r — 28) em. 
5) < 
5 3 | 
À Z No. A B Mean No A B | Mean 
AE ET 30 44 44 44-0 2 NE I ENT ou 
sh A 4 340 27 PME 27-0 3 348 2 2 | 2-0 
—————— = = 
= | Mean a 5 35-5 c 5 35-5 
2u 50 17-0 35 7: One 
7 W D 340 23 | 23 | 23-0 6 348 0 | 0 | 0-0 
2 E 8 30 56 56 36-0 7 23 15 15 | 15-0 
Æ | Mean b 5 39.5 d EVE 
2u 50 33-0 35 15-0 
a+b c+d 
Mag. Mer. = 5 37°5 5 36-5 
2 2 
Mean Mag. S. Mer. 5237-10 
P 
P(t) 
H r? i C H 
Eormnuls EN — SS SSS — == ; log H = ( log —+log m = ) 
m 2u Sin u Sin u m 
(i+ ie 
re 
0 
I JO Set I II 
o LA o LA EE | 
2 u (mean) 50 25-0 35 11-0 log C 6-11254 5- 96363 
2u 25 12-5 17 35-5 “ Sin u 9- 62932 9- 48034 
H 
Mark reads A 0 00 « — 6- 48322 6- 48329 
B 180 00 m 
Coin lake 1-39354 1-39354 
Mean 
h m S ÉD ET 8-93838 8- 93842 
Began at 12 12 Temp. 16-8 
H 0- 08677 0- 08678 
Ended at 28 Se 16-6 
————— log m 2-45516 2-45512 
Mean 12 20 — 16-7 Red’n to 20° —67 — 67 
Chr. to L. M. T. 2 35 log ms 2- 45449 2-45445 
L. MT, 9 45 ip 284-77 284-74 
s “ 
*From oscillations. 
