ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 
483 
Length of spark in dry and in moist air. 
Many experiments were made to ascertain the effect of saturation with aqueous 
vapour on the length of the striking distance; for this purpose the bell-jar and 
micrometer-discharger, as shown in fig. 9, were used. 
Fig. 9. 
The terminals employed were two paraboloidal points. The striking distance with 
10,860 cells was found to be in air dried with phosphoric anhydride at a pressure of 
30'345 inches (77 '1 centims.) 0’57 inch (1 *45 centim.). 
The bell-jar was now removed and after having stood for a little while over a dish of 
water, was then replaced on the plate of the air-pump ; in the bell-jar was placed a 
beaker, p, containing water to keep up the saturation, under these circumstances the 
striking distance was then found to be 
Inch. 
0*58 (1*5 centim.) 
after the lapse of 30 min. 0‘58 (1*5 ,, ) 
,, ,, 4 hoars 0‘55 (14 ,, ) 
„ „ 5 „ 0-54(14 „ ) 
In another series of experiments with 8700 cells, the striking distance in dry air 
was found to be 
