RESIDUAL CHARGE OE THE LEYDEN JAR. 
613 
Experiment a . — The flask was charged to 462 divisions for five hours; on insulation 
the loss was found to be 4 to 5 divisions in an hour; hence B=0-00016. 
Experiment 0. — Charged to 462 for 10 seconds ; a loss of 2 in 3 minutes was observed 
on insulation. 
Experiment y. — The flask was charged with 48 elements, each equal to 67 divisions 
of the scale, for 5 hours, and was then discharged. 
At 1 minute, 4^ divisions in ^ minute. 
,, 2 1 minutes, 6 „ „ 1 „ 
)) 5 55 6 ,, ,, 2 ,, 
or 
vf/(l)-B= 0-004 
4/(2|)-B=0-002 
4<5)-B=0-001. 
The residual charge is smaller than in any other glass observed. 
A few of the results of the preceding experiments are collected in the following 
Table for the purpose of ready comparison. 
I. The greatest value of -fyt observed. 
II. „ least „ „ ,, 
III. \f/(l) — B as obtained by experiment y. 
IV. 4/(5) -B 
V. 4/(60)-B 
Glass . 
I . 
II . 
III . 
IV . 
V . 
1 . 
10-2 
3-4 
0-21 
0-073 
0-025 
2. 
2-45 
0-76 
0-28 
0-08 
0-018 
3. 
1-0 
0-05 
0-01 
4. 
0-28 
0-0005 
0-0215 
0-0064 
0-0013 
5. 
0-23 
0-006 
0- D 57 
0-021 
0-0042 
6. 
0-013 
0-001 
0-02 
0-006 
1-0008* 
- 7- 
0-00002 
0-0017 
0-00026 f 
8. 
0-07 
0-0004 
0 017 
9. 
0-002 
0 003 + 
10. 
0-0014 
0-00016 
0-004 
0-001 
From this Table two classes can at once be selected as having well-marked characters. 
The soda-lime glasses, although the composition and colour vary widely, agree in 
* il(75)— B. 
i M 20) -B. 
t ^(50)-B. 
