168 . Loomis on the Variation of the Magnetic Needle, 
The following table shows for six months of the year, 
quantity by which the variation at the hour named in columt 
first, differs from the mean variation for the month at Toronin — 
The table is derived from five years observations between 1848 
and 1848, and is copied from’ page 90, vol. iii, of the ‘Toroaid 
observations. 
Diurnal change of the Magnetic Variation at Toronto. — 
Hour. April. May. June July. August, 
i i 3 
Bam. | 496E. 582E. } 620E. 626B. } 6905. 
9 * 396 E. | 418 E. 4°72 E. 4-86 E. 476 E. 
10 « 1-30 EB. 064 E 1-73 E. 1°78 E. 054 E. 
ib * 2-02 W 306 W. | 200 W. 1-76 W. 3:12 W. 
noon, 454 W 524W. | 4:72 W. 4-24 W, 6-00 W. 
1PM. 5-98 W. 628 W. | 620 W. 586 W, 722 W. 
Q « 5-84 W. 610 W. | 626 W. 5-96 W. 6°52 W. 
3 * 498 W 434 W. | 5:26 W. 5-12 W. 5-04 W. 
4% 3-30 W. 312W. | 376 W. 3-68 W. 2-74 W. 
Ss 1-66 W. 1:26 W. | 168 W. 1:86 W. 1:02 W. 
6 « 0-80. 0-44 W. | 0-62 W. 0-70 W, |}. O18 W. 
7 0-32 W 022 W. 028 W. | 0-36W. 0-13 W. 
aan 0-44 E O18 W. | O32W. | O66W. | O10W. — 
& 
The following table shows for the same months the quantilf 
by which the variation at the hour named in column first, G8" 
from the mean variation for the month at Washington. itis 
derived from two years observations from 1840 to 1842, and® 
deduced from the table on page 326 of Gilliss’ Magnetical Obs 
vations, epee 
Diurnal change of the Magnetic heceon seed Wal ae 
Hour. April. May. June. | = July. August. 
hm ; : j ; A 
0124.M.| 0:97 E. 0O65E. | 067 E. 0:96 E. 0:82 E. 
212 181 E. 0-93 E. 0:39 E. 116 E. 0-99 E. 
412“ | 242E. | 133K. f 187E. | 1S7E. | 126% 
612 .« 2-75 E. 3-65 E. 4:09 E. 3-58 E. 4-03 E. 
812 * 321 E. 3-97 E. 4-72 E. 4-56 E. 530 E. 
10 12 1-04 KE. 0-28 W. 0-19 E. 094 E. 059 W. 
Ol2r.m.} 337W. | 380W. | 383W. | 386W. | 563W 
212 * 5-12 W, 460 W. | 480 W. 5-31 W. 551 W. 
412 « 3-26 W. 245 W. 336W. | 341W. 2-65 W 
612.4 169W. | 048 W. | 062 W. 1-19-W. 0-70 W 
812 * | OO1W. | O64E. 0-80 E. 1-01 W. 127E 
1012 “ | 1258, 0-45 E. 0-48 E. 1-03 E. 1-75 E. 
The following table shows the observations of the 
n. Column fir 
first shows the day of the 
and year; column second the hour of observation ;_colu™. 
tained by gag 
Washington and Toronto observations. 
