* 
66 G. T. Kingston on the Aurora at Toronto. 
guise the changes between consecutive observations. The di- 
gressions of the total force and of the inclination have been 
computed from those of the horizontal and vertical compo- 
nents of the force. 
Magnetic righ pee preceded seh peta eta the Au- 
ra of April 15, 
Table giving the Aes of Ae declination, total force, 
and inclination.—The digressions of the declination are ex- 
pressed to the nearest minute of arc, those of total force on, 
inclination are expressed in terms of the disturbance limi 
The disturbance limit of the total force is four times the ue 
thousandth part of the force, and the limit for the inclination 
is one minute of arc. 
Deviations from the mean normal. ie viations from mean normal. 
Toronto otal Force Toron Total Force 
Astronomical Declination. | unit= ‘0004; Dip. Astrgnomical or unit=°0004 | Dip. 
Time. of the me. of the 
total force. | total force. 
April HH. M. April #H. M.| 
14, 18 0 4’E. — | mee 15 9 15)9 W. — 1 |]+1 
20. 0; 15 E. — il + 9 30:24 W + 3 j+ 
23: OF 2B WwW. — 38 + 4 9 45:17 W 0 j= 
15:20 Of 14-8, pay feed ee i0 0| 6] — |] + 
SO) .06 eo): — 6-1 oa 10 15/19 W 0. J+ 
815] 42 E. + 10 37 10 30/36 W. | + 1 {+ 
3 30 ow: + il 30 10 26 J — 16 /+ 1] 
3 45 9 EK. + 9 {— 21 11 0/74 1 + 5 |+ 21 
4 0 9 W. + 9 j—.8l LL 15 21 W. — 13 {+ 3 
4 15 7 iE. + 3 14 11 30.30 — 8 {+ 3 
4 30 9 W, + 5 8 11 45/25 — 5 {+ 
4 4 12 W. + 6 |— 8 12-013 — 8 |+- 3 
Beef 3 E. + 10 |— 18 12 15} 1 — 2 |+ 3 
5 16 8 H. +1 — 45 12 30) 6 + 1 f+ 
foe) Sl. W. +1 — 36 12 45/18 + 1 + 
5 46 19 W. + — 383 18 0|11 E. + 3 |— 
en | 6 E. + 6 }|— 25 13 15} 4. E. + 38 j— 
6 Li 19 E. +: J — 24 18 30)15 E. + 4 is 
6 36 14 E. — € — 2 14 0} 1 EK + 1 j+ 
6 4! 4 EK. — 10 |— 18 14 30) 4 E, O i+ 
41 O 14 W. — lil |j— 11 15 OL. 2. W. + 3 j+ 
4A 85 W. — % + 15 15 30) 4 W. + 1 [+ 
7. o 68 W. — 14 }+4+ 16 16 O} 1 W. — 8 /+ 
74 o W. - ili + 16 30 6 E, — 8 i+ 
&. GO - s W. — 23 |+ 6 17. 0:10 KE, + 2 }+ 
8 15} 19 B. — 15 |+ 10 18 0} 7 E. — 2 j+ 
8 3 28 E. — 20 |+ 14 18 30}11 E. — 2 }+ 
8 4! 3T KE. = 12) 2] 19 O18 BE. = 2 
9 | * ] — 6 {+ 20 a 
Declination.—As regards the desliation the average devia- 
tion was 15 of arc, or three times the limit required to entitle 
a disturbance to be considered aslarge. The easterly deviations 
were the more numerous, but the westerly were on the average 
50 per cent greater in extent. — 
