26 



Mr. 0. J. Lodge. Experiments on 



[June 4, 



And at greater distances, when no regular spark occurred at C r 

 there was still a brush discharge there at every A spark. 



Joining up a small jar to the C 3 terminals, the long sparking and 

 brushing there ceased. 



Without this shunt jar, however, and with the terminals well sepa- 

 rated, the wires glowed at every A spark along a considerable portion 

 of their length, looking thick and fuzzy with momentary luminosity. 

 (The wires were the long thin (No. 18 B.W.G.) copper and iron 

 round the room : those two being up and handy for the experiment. 

 They show the luminous appearance better than either thicker or 

 much thinner ones.) With a small condenser the effect was not great, 

 and with a very big one it was also not great ; but with a single 

 gallon jar the glow on the wires extended more than half way round 

 the theatre, and a pair in series (i.e., half the capacity) seemed to do- 

 even a trifle better. 



FIG. 15 



27. To see if the proximity of the opposite wires assisted the effect 

 one of them was reversed, so that the plan was as in fig. 15 ; but the 

 far ends of both wires got luminous as before (although the luminous 

 portions were now on opposite sides of the room), and the luminosity 

 extended from 3 to 2 on the one wire, and from 3' to 2 on the other. 



28. A jar was held in the hand near either glowing terminal, for 

 the wires to spark into. They kept on doing so, but the jar was not- 

 charged, showing that they sparked in and out again. 



