electric discharge with the chloride of silver BATTERY. 121 
Spark, comparison of curves of length of spark with different terminal 
„ length of, effect of atmospheric variations on 
„ „ „ accumulators on 
„ „ in different gases 
„ „ in air at pressures less than atmospheric 
Spherical surfaces, length of spark between 
Stokes, Professor, note on attraction of paper to disc of discha 
“ Streamer,” character of, noise accompanying . . 
Thomson, Sir W., observations on length of spark 
Volts, combination of cells for producing an exact number of 
Vulcanised rubber stoppers, reasons for abandoning 
Wires of different metals, deflagration of . . 
„ contraction or expansion of, during discharge tested 
Weber current, electrolytic value of 
fig. If 
114 
PAGE. 
86 
93 
86 
95 
-115 ; 118 
66-71 
115 note 
88; 11.8 
70-72 
114 
113 
100-101 
101-102 
103 ; 111-112 
MDCCCLXX YII r, 
