KESIDUAL CHAEGE OF THE LEYDEN JAE. 
605 
I. 
II. 
III. 
IY. 
V. 
! 
150 
170 
160 
162 
1 
80 
92! 
86J 
79 
2 
22J 
32 
31 
3 
io| 
29 
19| 
18 
4 
5 
23 
14 
13 
5 
0 
20! 
10| 
8 
7 
— 4 
18! 
■ 7 
6 
Glass No. 2. — This glass is of a deep blue colour ; it is composed of silica, soda, and 
lime, the quantity of soda being less than in No. 1, but of lime greater. The colour is 
due to a small quantity of oxide of cobalt. The temperature throughout ranged from 
62° F. to 64° F. 
Experiment a. — The flask was charged for several minutes, and then insulated. The 
intensity of the charge before insulation, and at intervals of 5 seconds after, was 
observed, the whole experiment being repeated three times. The mean is given. 
Time 0. 5. 10. 15. 20. 30. 40. 
Beading ... 497 465 433-6 405 379 342 311 
B=0-77. 
Experiment j3 . — The charging lasted 2 seconds. The flask was then insulated, and 
its charge measured at intervals of 5 seconds. The mean of two fairly accordant obser- 
vations is given. 
Time 0. 5. 10. 15. 20. 
Beading ... 490 390 325 282| 249 
Hence \J/(0)>2-4, probably much greater. 
Experiment y . — The flask was charged with 48 elements for 8 hours in the first 
experiment, and subsequently for 3 hours 25 minutes for a second experiment, the 
effect of the previous charging being still considerable when the charging began. After 
discharge the flask was from time to time insulated for 20 seconds , and the residual 
charge developed in that time was observed. 
I. gives the time from discharge to the middle of the periods of insulation ; 
II. and III. the observations in the two experiments ; 
IV. the results corrected by a curve from II. and III. ; 
