148 THE ROYAL SOCIETY OF CANADA 
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 15L Invert deflecting at right angles to Magnet 15 S Invert suspended. 
Circle Readings 
z EE SE Pe ee en ee 
+ x Le Distance r — 25 cm. II. Distance r = 28 cm. 
= 7, No. A B Mean No. A B Mean 
nr 8 a0) a dl A7 47-0 7 ie oa Soa 14 14-0 
en 0 bok) 5 340 2B UN 28 | 28-0 6 348 3 3 3-0 
= | Mean a 5 37-5 c 5 38-5 
2u 50 19-0 30 11-0 
Al 4 |340 28 | 28 | 28-0 3 |348 0 | 0 | 0-0 
» E 1 DES 53 53:0 | 2 23 20 20 20-0 
Cok | ooo ee a ——— 
| Mean b 5 40-5 d 5 40-0 
| 2u 50 25-0 35 20-0 
a+b | e+d 
Mag. Mer. 5 39-0 5 39-2 
2 2 
Mean Mag. S. Mer. 5° 39’-1 
P 
PA CE NS ) 
H r2 1 C} H 
Formule: — = —__—_—_—. — = loz H = ( log— + log ma ) 
m 2u Sinu Sin u m 
PES 
3 
I II Set I IL 
o LA o LA 
2 u (mean) 50 22-0 35_ 15-5 
log C 6-11254 5- 96363 
u 25 11-0 117 37°8 “ Sin u 9-62892 9-48124 
H 
Mark reads A 0 00 « _ 6- 48362 6- 48239 
m 
B 180 00 | | ——_—_ 
_ MS ae 1-39295 1.39295 
Mean ye 8-93828 8-93767 
h m 2 
Began at 12 32 Temp. 16-6 
H 0-08675 0-08663 
Ended at 44 Ms 16 —_ | ————— | — 
———— — log m 2- 45466 2-45528 
Mean 12 38 t= 16-4 Red’n to 20° —73 —73 
Chr. to L. M. T. 2 35 log ms 2.45393 2-45455 
DAME 10 3 m 284-40 284-81 
s 
*From oscillations. 
