[JACKSON] MAGNETIC OBSERVATIONS IN CANADA 143 
DECLINATION. 
Date 1910 | 75th. Meridian Agincourt Magnetometer A-15 
time. Standard 15 
h m O lo Oo /, ! 
Apr. 21 130 —6 8-1 —6 8-2 +0:1 
| 15 12 AS 7-6 +0:3 
Sept. 28 15) IL SEE) flot +2-2 
2s 16 45 4.2 4-8 +0-6 
020 10 36 17-8 18-5 +0:7 
DT) 122206 19-0 20-0 +1-0 
Oct. 18 LOI 6-8 8-2 +1-4 
aed 10 48 9-0 10-4 +1-4 
19 12227 14-0 16-1 +2-1 
eG a) By 13-2 14-1 +0:9 
2 19 14 48 19-3 20-1 +0:°-8 
9 15 20 17:8 18-8 +1-0 
“19 15 39 13-4 14-2 +0-8 
Mean correction +1-0 
Probable error +0-1 
HORIZONTAL INTENSITY. 
Date 1910 | 75th. Meridian Agincourt Magnetometer A-15 
Time Standard No. 15 
hy om 
April 21 13 54 0-16281 0- 16262 +0-00019 
"Sept. 28 TOR 0-16268 0- 16247 +0-00021 
29 11 50 0-16199 0-16178 +0-00021 
Oct. 19 11 42 0-16213 0-16196 +0-00017 
TO 14 14 0-16231 0-16213 +0-00018 
Mean correction +0-000192 
—+0-00119 
part of H 
As no corrections for diurnal variation have been made the local 
mean time is given, for each individual observation. Chronometer 
comparisons were made at Toronto Observatory and also at Edmonton 
at the beginning and ending of the seasons work. 
Latitude, time and Azimuth observations were made with Magneto- 
meter No. 15 theodolite and longitude was calculated on the assump- 
tion of uniform rate of the chronometer. 
The subjoined sample serves to show the method employed in field 
work with Magnetometers of this type. 
