horizontal needle when under the influence of magnets. 367 
needle, having their poles directed towards those of the same 
name of the needle, and their axes coinciding with the me- 
ridian, so that the north end of the needle still pointed to 
zero. The magnets were then brought in towards the centre, 
their axes still coinciding with the magnetic meridian, until the 
distances of their nearest ends were each 16.95 inches, when 
the north end was in equilibrio at each of the three points, 
N 25 0 26' W, N2o°io'E, S 2° 20* W. 
that is, the needle being led near each of these points by 
means of a small piece of iron wire, settled steadily at each, 
after agitation. 
I now drew lines perpendicular to the meridian, from the 
ends of the magnets, and measured off distances of .05, .10, 
.15, .20, .25 of an inch on each side of the magnets at the 
ends nearest to the centre, and distances at the farther ends 
corresponding to them ; so that the sides of the magnets co- 
inciding with the respctive points, the north magnet towards 
the east and the south magnet towards the west, or vice 
versa, the line of their axes had described angles from the 
meridian, about the centre, the tangents of which were 
1^5 ’ 1^95’ 7^95’ & c - respectively, or very nearly angles of io', 
2 o', 30', &c. 
In the following table, the angles which the north end of 
the line of the axes of the magnets made with the meridian 
are placed in the first column, and the points of equilibrium 
corresponding to these situations of that line are placed op- 
posite to them in the following columns. When not stable is 
placed in the column, it is to be understood that the needle 
rests near the point above, but, on being in the least agitated, 
moves to the point which is found to continue stable through 
out. When no point is placed, it is to be understood that the 
