362 
DR. j. HOPKINSON OiST THE ELECTROSTATIC 
Double extra-dense flint. Density, 4 - 5. Thickness of plate, 24"27. 
I. 
II. 
III. 
IV. 
Y. j 
200 elements used, 100 to each condenser, glass in contact 
with both plates.. 
1000 elements, contact with both plates. 
1000 elements, resting on lower plate, space between glass and 
upper plate. 
Ditto ditto ditto . . . 
Ditto ditto ditto . . . 
Glass separated from lower plate by three small pieces of 
ebonite also separated from upper plate. 
24-27 
24-27 
24- 69 
25- 19 
25-39 
25-19 
2-48 
2-48 
2- 865 
3- 36 
3-57 
3.36 
2-48 
2-48 
2-445 
2-44 
2-45 
2-44 
9-78 
9-78 
9-92 
9-94 
9-90 
9-94 
Mean of last five experiments, K=9 - 896. 
Result formerly published, 10*1. 
Dense flint. Density, 3‘66. Thickness of plate, 16'57. 
I. 
II. 
III. 
IV. 
Y. 
Glass in contact with both plates, 400 elements. 
16-57 
2-265 
2-265 
7-31 
Glass in contact with both plates, 1000 elements. 
16-57 
2-265 
2-265 
7 31 
Glass resting on lower plate, 1000 elements. 
17-19 
2-85 
2-23 
7-43 
Ditto ditto . 
17-69 
3-36 
2-24 
7-39 
Mean of last three experiments, K=7’376. 
Result formerly published, 7'4. 
Light flint. Density, 3‘2. Thickness of plate, 15’04. 
I. 
II. 
III. 
IY. 
Y. 
Glass in contact with both plates, 1000 elements. 
15-04 
2-215 
2-215 
6-79 
Glass resting on lower plate, 1000 elements . . 
15-29 
2-505 
2-255 
6-67 
Ditto ditto . 
15-69 
2-865 
2-215 
6-79 
Ditto ditto . 
16-19 
3-42 
2 - 27 
6-62 
Mean value of K = 6’72. 
Results formerly published, 6'89 and 6 - 76 = 6‘83. 
