345 
on the Rates of Chronometers. 
3y placing the time-keeper on the last-mentioned magnetised 
plate, with XII pointing south, it was found that its detached 
rate of — 0".6 was changed to -f 3".0 ; and by turning it, so as 
to bring XII to the west, the last rate was increased to -P I6".9 ; 
and moving it through another quadrant, having XII to the 
north, the rate became -f 5'M ; and by turning it through a 
fourth quadrant, bringing XII to the east, the daily variation 
became + SO". 4. These results are arranged in the next 
Table. 
Situation of the Chronometer. 
Daily Rate, 
Detached. 
— 0".6 
4 3". 0 
XII S. 
XII W. 
XU N. 
+ 5".l 
XII E. 
4 20"A 
During the observations with the preceding chronometer, it 
was remarked, that the difference even of |th of an inch, in the 
position of the chronometer on the magnetised plate, was con- 
^stantly accompanied by a sensible alteration of rate. In the 
experiment immediately succeeding the last recorded, the time- 
keeper was removed a quarter of an inch from the situation it 
then occupied, towards the north pole of the magnet, when its 
daily rate, with XII pointing south, was -f- 3".5, it having been 
only -f ^"^0 in the preceding experiment. On turning the ma- 
chine through a quadrant, so as to bring XII to the west, the 
daily Variation was increased to -f S3".7 ; and on moving it 
through another similar space, to make XII point north, the 
daily rate became 4- 6".7 ; and by moving XII round to the 
east, this last rate was augmented to -f 22".6 ; and on restoring 
the position of the chronometer, with XII directed to the 
south, the daily variation became -j- 4".l, agreeing within -f- 0".6 
of its rate in the same position in the early part of the experi- 
ment. 
Hence it appears, that the rates possessed by the time-keeper 
during its first positions on the magnetised plate, were all aug- 
mented by moving it nearer to the north pole ; and that the 
