120 
MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
Discharge preceding the formation of an arc (“ streamers ”), character of 
Discontinuity of “ streamer ’’-discharge from a point positive . . 
Discharger-Micrometer 
Electrolysis, experiments in 
Electro-motive force. See “ Chloride,” “Bromide,” “Iodide” 
Electro-magnetism, experiments in 
57 
Galvanometers for high potentials 
Gas-jet, attraction and repulsion of 
Gases, appearance of arc in different 
„ length of spark in different . . 
Gaugain, observations on length of spark between concentric cylinders 
Glass cells, breakage of 
Induction coil for high potentials . . 
Intermittent spark produced by introduction of resistance 
Iodide of silver cell, electro-motive force of 
„ ,, large formation of oxy haloid salt in 
Key, double-reversing, for high potentials 
Metal, effect of, on striking distance 
Micrometer-Discharger 
Microscope (insulated) with revolving mirror 
Neyreneuf, M., effect of opposite poles on gas-jet 
Oscillation of fine wire used as a terminal 
Oxychloride of zinc, formation of, on zinc of cells 
„ ,, analysis of 
,, „ rate of formation 
,, ,, removal of by scraping 
„ „ „ ,, acidulating 
,, ,, electro-motive force of chloride of silver cell, before and after formation of 
Paper slip, attraction of, to disc of discharger . . . . . . . . . . . . 90-92 ; 
Plane surfaces, length of spark between . . 
Platinum, substitution of, for silver in cells, advantage of and cost 
Point. See Arc. 
Potential of chloride of silver cell becomes less as ZnCl 2 accumulates in liquid 
Rapid current-breaker 
,, ,, reverser 
Resistance (wire) for high potentials 
„ liquid . . . . . . • . 
Safety wire, use of, witb “ vacuum tubes ” 
Secondary currents, experiments in 
Shocks, danger of, tested 
Spark, length of, between concentric cylinders . . 
plane surfaces . . 
spherical surfaces 
two points 
a point and a disc 
„ „ affected by form of point 
,, „ greatest with an aluminium point 
independent of internal resistance of battery 
90 
57-58 
97-98 
-57; 114 
107-108 
64 
93 
96 
95 
75 note 
111 
64-65 
90 
57 
114 
59 
93-94 
57-58 
89 
93 
92 
111-113 
113 
113 
112 
112 note 
84 note 
115 note A. 
73 
109 note 
116 
64 
.. 62-63 
64 
64 
100 
105-107 
104-105 
74-75; 118 
63; 118 
66-71 ; 118 
85; 118 
80-85; 118 
. . 76-79 
. . 93-94 
65 
