and Directive Force of the Magnetic Needle. 35 
These values of E show approximately, the comparative mean 
rn gee of the ecliptic currents at noon, in the several months, 
the values of R the intensities of the radial currents at 6 A. M. 
urnal effects of the two systems of currents. It appears that the 
intensity of the radial currents is twice as great in June as in De- 
cember, while the intensity of the ecliptic currents is twice as 
great in December as in June. It would naturally be supposed 
that the radial currents would be more intense in summer than in 
Winter; and it is to this fact that we are to attribute the vost 
in the diurnal range of the ee force from winter to s 
mer, If we take the range from 6 a.m. to 6 p.m. it will be 
entirely to the action of the radial subband and will be4 
tional to R. ‘The range from the morning minimum to 
the s 
gth 
passage across the prime vertical (p. 32), pe he's createst action 
to augment the horizontal fone bolo -the passage across the 
i TABLE I 
sa jee rna ng Variation of the Horizonta Pee in each Month of a Sit at 
" Toronto ; derived from Hourly Observations in the Years 1843 to 1 
Astron. 
bee hit hes fie T tres ly ee mS rh | A o | Oct. to | Ann. 
yim an, iow ite Peek est Bs Bopt inc. Mar inc. ‘Means 
00] 00) -00 ea 700,| 00 | -00 | 00) -00 | 00) “00 “00 | 00 
0* (008 | 126/057 | 0 + 055 053] 0681039 014/000) 052 010 | 026 
1 960 100 oe 074 098} 149068! 040/022, 095 | 0389 | 062 
2 084 099,144] 138126 141) 205/110) 084/067;. 142 | 079 | 105 
3 143/169 | 168 oe 171] 245|184| 112\096' 174 | 113 | 188 
4 164,181 /178 161, 175) 253/155, 128/127, 185 | 135 155 
5 73/17 173} 238|151/ 120/126 183 | 183 | 158 
6 158/152 | 161 | 141) 144] 215]134 121/125. 162 | 122 | 1 
7 129/144 | 139 122] 190)122) 120)124,, 142. |. 117 | 125 
8 108/120 | 112 106 115) 178/111, 118/108 123 | 109 | 111 
9 096 116 | 092 095) 103] 171|102/ 104/097 112 | 097 | 1 
10 90,089 | 082 078 091] 164/097 086/086 099 | 088 | 089 
11 nie 068 066, 069| 151/085, 085/084 081 | 081 | 0 
iy eS 60,064 | 062 051, 068] 1391083| 075/060 074 | 068 | 066 
13° 047/052 | 052 048 072/057! 062 | 058 
14 9051041 | O51 041) 052) 1 079\069 051 | 058 | 049 
15 pacar 041 030) 039) 111}073, 084/072 045 | 067 051 | 
16 51K 027| 045] 134)061/ 091/068 057 | 069 058, 
17 959 031 (Ot pas 4s 131}091 102 054 O57 | 077 | 062 | 
18 | 1) 048) 119 115.067 057 085 | 066 
19 | (108 036 ¢ 06 38/042 | 089 oad 036} 091} 103 8 O71 55 
20 '088 026 OBR /029 028 | 030 ie: 023] 064)024) 070 035 | 050 | 037 
21 (060 023 015 015,002 | ‘O14 016) 001) 020/900) 030/045 011 | 027 | ul4 
22 |024.008 005 003 011/022 000 | 010 | 000 
23 (000.000 000/901\020 020 017. 024| 016! 017 004) 000006 016 | 000 | 003 
a Ig el Na a a ca ate ee ee ME 
& 
