and magnetic rotations. 
507 
Oscillations of tbe 
Difif. 
\ Diff. 
Mean point. 
needle. 
O 
0 
0 
0 
R . . . . 1 6 
L ... . 18 
2 
I 
l 7 
The lamp was now lighted. 
R.... 15.5 
L .... 25 
19 5 
475 
20.25 
R 18 
L 31 
13 
6.5 
24.5 
R . . . . 14 
L .... 34 
20 
10 
24 
R . . . . 14.25 
L .... 33.2 
1 9 
9-5 
237 
R 16 
12 
L .... 28 
6 
22 
R .... 21 
23 
L .... 25 
4 
2 
R 20 
L .... 29 
9 
4-5 
24.5 
The wax now became more heated, and gradually bent 
until the glass index touched the graduations. The number 
of revolutions of the pewter plate and lamp were 56 per 
minute. 
Experiment 12. 
The same apparatus being used, a brass needle was sub- 
stituted for that of sealing-wax ; it was suspended \ inch 
above the leno muslin screen, which was inch above the 
pewter plate ; these distances were the same in Experi- 
ment 11. The plate and lamp made 56 revolutions per 
minute. 
The observations were made as in the last experiment. 
The apparatus being at rest, the mean point was 2 0 . 
