to 
\ 
=) 
TABLE 2. 
Voltage before ; 
Sheed Magnet Voltage with Type of discharge 
was excited Magnetism Effect of Magnetism on form of discharge 
1 21500 21500 Glow. 
2 22000 21850 Small brush. 
3 22500 22000 Occasional spark. 
4 20000 22500 Changed to brush by magnetism. 
5 22500 22500 No change. 
6 20000 22500 Changed to brush. 
7 18800 26500 oo ee 
8 18800 24000 2 Ne ae 
9 18800 23500 be giant 
10 18800 18800 No change. 
11 18150 25000 Changed to brush. 
11 18150 18150 Not changed to brush. 
12 18150 18150 No change. 
13 18150 24000 Changed to deflected scattered sparks. 
14 18800 25000 Changed to brush. 
15 18800 24000 | Scattered deflected sparks. 
16 18500 25000 Changed to brush. 
The above table shows that there is no regularity in the changes in 
the discharge due to the influence of the magnetism. In No. 11 the spark 
discharge was entirely changed to brush for a while, then broke into a 
spark again, changing sometimes two or three times per minute. When the 
exciting current was stopped the sparking was again resumed. In the many 
complete sets of readings similar to the above it was found that this change 
appearing in No. 11 occurred for any of the spark discharges, but the actual 
condition that caused it was not discovered. One could not foretell when 
the discharge would be altered by the influence of the magnetism. Series 
H, shows photographs of the same sort of discharge as Hi, in which there 
was no change due to magnetism. These were taken twenty-four hours 
later than those of Hi, and on this particular day no change occurred in the 
discharge, when the current was in the direction shown in H,, while on the 
previous day, with the same conditions in so far as apparatus was con- 
cerned, the spark was changed to brush every time the exciting current was 
closed, regardless of the direction of the magnetism. In series H, the 
spark was changed to brush by the magnetism when the other point was 
made positive, the photographs being like the corresponding ones of 
series Hh. 
[1726988] ! 
