produced by the Explosion of Hydrogen and Oxygen. 475 
(J =the quantity of electricity in micro-coulombs 
thrown on to the wire W, 
g=the quantity in micro-coulombs per mm. fall of 
pressure (=Q/y!), 
V =The (positive) potential in volts of the outer 
cylinder, that of the wire W being initially 
ZeCTO. 
TABLE I. 
Dasha | p" | V. Q 7 
| > —— = 
W745 | 685 | 6 ae esac 1-087 
87 81 6 ai | 17 02] 
77 72 5 124 | 145 | 02 
78:5 3 155 206 46 | -0073 
8] 74 ii 206 5 0068 
80 60 20 4] 24 | -004 
96 90 Gan 4] 45 =| «+005 
103 100 = ie Ota -32 | -0082 
875 2 55 | 208 = 587 | -0072 
5) eee 2) |. 208 231 | -0039 
The amount of air present was 4] mm. in the last experi- 
ment; in the others it was less than 1 mm. 
The capacity of the condenser used varied from one-fifth 
of a microfarad to a microfarad, the potential to which it was 
raised lay between a quarter of a volt and two volts. The 
charge observed was therefore much larger than had been 
anticipated from the preliminary experiments, ranging, as it 
did, from a quarter of a microcoulomb to nearly two micro- 
coulombs, and the electrometer was accordingly discarded in 
favour of a ballistic d’Arsonval galvanometer. To measure 
the charge the wire W was connected with one terminal of 
the galvanometer, the other terminal being put to earth. 
Thus the whole charge passed through the galvanometer and 
was measured ballistically. The following are the results, in 
which Table II. refers to a low-resistance galvanometer, 
TABLE I]. 
p- ps ce i. | We Q. q: 
86 79 7 7. | 240 11-4 144 
Sa ils. 3BA0 Bodice. eee 
4 
88 84 4 Fg il i Ce aes ia a 4 237% 
