leo 
explained above by multiplying the magnetic force with 
5/127T, and is therefore approximate only as far as its 
absolute value is concerned, but the ratio value of the 
numbers ought to be correct. The Greenwich result 
applies to the year 1882, that for Bombay is founded on the 
mean values during a succession of years. 
GREENWICH. 
BOMBAY. 
Time 
(Astronomical.) 
Intensity 
(Amperes 
10-6). 
Direction. 
Direction. 
Intensity 
(Amperes 
10 --6). 
Time 
(Astronomical). 
Oh. 
366 
+ 53° 
-67« 
556 
Oh. 12m. 
1 
398 
+ 36 
—65 
442 
1 
12 
2 
364 
+ 24 
-65 
282 
2 
12 
3 
282 
+ 14 
-75 
125 
3 
12 
4 
184 
-2 
+ 0 
8 
4 
12 
5 
128 
-29 
+ 88 
92 
5 
12 
6 
126 
-72 
+ 85 
165 
6 
12 
7 
136 
-87 
+ 85 
229 
7 
12 
8 
146 
-104 
+ 85 
253 
8 
12 
9 
149 
-117 
+ 88 
261 
9 
12 
10 
149 
-121 
+ 90 
251 
10 
12 
n 
146 
-124 
+ 86 
231 
11 
12 
12 
138 
-159 
+ 98 
211 
12 
12 
13 
120 
-132 
+ 100 
201 
13 
12 
14 
110 
-136 
+ 100 
188 
14 
12 
15 
110 
-136 
+ 97 
177 
15 
12 
16 
118 
-132 
+ 94 
165 
16 
12 
17 
124 
-134 
+ 98 
152 
17 
12 
18 
136 
-149 
+ 127 
132 
18 
12 
19 
168 
-169 
+ 139 
181 
19 
12 
20 
219 
+ 170 
-152 
223 
20 
12 
21 
263 
+ 145 
-113 
348 
21 
12 
22 
277 
+ 116 
-90 
462 
22 
12 
23 
289 
+ 80 
-76 
569 
23 
12 
The table well repays a careful study. The Bombay 
observations on magnetic declination refer, as regards time, 
to twelve minutes past each hour. The observations at the 
same place on horizontal force to fourteen minutes past each 
hour. This is only one of the many little devices by means 
of which the heads of magnetical observatories try to 
enliven the time of those who want to compare their results. 
The direction of the currents is reckoned from the geo- 
graphical north towards the west as positive, and towards 
the east as negative. It is very remarkable how very nearly 
at the same local hours the currents flow north and south at 
