9 
on the Rates of Chronometers. 
cumstanced, is remarkable), the latter furnished ; and, 
lastly, when (B), in the position of Fig. IS., indicated a rate of 
4- 8".7, the time-keeper (C) gave a result of — 8".S. 
In a subsequent set of experiments, the chronometer (C) was 
successively applied to the south pole of the same magnet. The 
results are recorded in the following comparative Table, the 
time-keeper (B) being at the same time applied to the opposite 
pole. 
Situation of Chronometer (C). 
Daily Rate 
when applied 
to the North 
Pole. 
Daily Rate 
when applied 
to the South 
Pole. 
Plate I. Fig. 9. 
+ 15'/.7 
+ 12".0 
Fig. 10. 
— 4".2 
+ 3".2 
Fig. 11. 
+ 22".4 
+ 18^6 
Fig. 12. 
~8''.2 
— 6".6 
In each of the preceding examples, it will be observed that 
the accelerations in the rate took place when the magnetic power 
was transmitted through the centre of the balance ; and the 
retardations, when it passed through the middle of the main 
spring. These results are the reverse of those recorded with 
respect to chronometers (B) and (C). In the pursuit of expe- 
rimental science, every result ought to be fairly and impartially 
recorded. The admirable maxim of Bacon, we cannot controul 
nature^ unless by making her manifest should ever be present 
to the mind of the inquirer. 
As an example of the comparative effects of the poles and 
equator of a circular magnetic plate, one of this form, 8 inches 
in diameter, and a quarter of an inch thick, was selected, and 
three chronometers (B), (D), (E) respectively applied to the 
parts here alluded to, as particularly represented in Fig. IS. 
The north pole of the plate is denoted by N, and when the 
time-keeper (B) was applied to it, so that its balance might be 
as near as possible to' the pole, its detached rate of — 8".l was 
changed into -f- ; but, on afterwards applying the same 
part of the chronometer to the south pole, the gain, instead of 
being 10".3, as observed in its former vsituation, was only 1".9. 
In like manner, on placing the chronometer (E), with its ba- 
