the particles of magnetic bodies , &c. 
Table V. 
83 
The magnets revolving with their axes at the distance 37 inches from the 
axis of rotation. 
Disc uncut. 
Disc cut as Fig. 1 . 
1 
Dise cut as Fig. 2 . Disc cut as Fig. 3 . 
6 
Tii^T 
CC 
'J ime. 
CC 
Time. 
CC 
Time. 
QC 
Si's a _ 
sec. 
sec. 
sec. 
sec. 
^ 6 ** 
fi 
360 
67-0 
1246-6 
88 -o 
75 i -3 
128-5 
389-4 
131-5 
375*3 
^ 0 
2 
720 
98-5 
1224-5 
132-0 
746-0 
217-5 
395*8 
236-0 
374*5 
o°S 
U 3 
1080 
125-0 
1221-8 
178-5 
727-4 
§ J-2 
1 4 
1440 
153-0 
I 192-2 
, c 
1800 
182-0 
I 184-0 
v_6 
2160 
224-0 
1161-2 
Values of £, and a 
= §6* 
269-5 
1150-5 
273-5 
709-5 
263-5 
386-5 
270-0 
37 i -5 
1197-3 
733-6 
39°'9 
373-8 
Here, the magnets revolving at the same distance in all 
cases, the mean values of a are measures of the magnetism 
developed under the different circumstances. The diminution 
of effect is sufficiently striking in the case of the ring remain- 
ing attached to the interior disc by four inches of its circum- 
ference, as in fig. 1 . but it is still greater in proportion when 
the connection between them is further diminished by one 
half, as in fig. 2.; and no very striking effect, beyond this, is 
produced by rendering the separation complete. If any 
doubts could be entertained of the correctness of the infer- 
ence respecting the effect of the absence of continuous matter, 
which I have drawn from the experiments when the magnets 
revolved at different distances from the axis under the entire 
disc, these last experiments, by exhibiting the effect itself in 
the most striking manner, precisely of the same nature and 
nearly in the same degree, must entirely remove them. 
