METALLIC WIRES BY ELECTRICITY. 451 
tion. Only one wire, which gave an extraordinary result, and 
had been supposed to consist of gold, was chemically examined, 
and on finding it to be very impure was thrown aside. Each 
wire was exposed to cautiously increased discharges, and on the 
first appearance of incandescence by daylight the indication of 
the thermometer observed. When the experiment was repeated 
on the same wire, the indications of the thermometer are placed 
close together in the following table; experiments on different 
wires are separated by a small space. The temperatures indi- 
cated in the second vertical column were for the most part ob- 
tained several weeks later than those in the first. 
Indication of thermo- 
Metal composing Radius meter at the time of 
the wire. in lines. incandescence. Mean. 
Exp. 16. Platina we. 003958 2555 24°83 
24°9 PS ee a SHO) 
17. German silver 0°04030 25°5 2526. cise, ZOeDD 
TS.tron!, 44/«,%.5, 0°04006 19-0 19°4 
19°8 19°4 
LO DMs th ss mactnest ll OLae 
.. 19. Palladium =O:039ar 26°3 
26°4 
Cae eS (NES eg OT ss 
ee. Brass’). i. 002461 10°9 
10°4 
LOPS sn elect pop Ord 
The following experiments were made with a more delicate 
thermometer. 
Exp. 21. Silver . . '0°02641 60°0 
63°5 
60°0 63°4 
56°73 .63°5 
59°6 
DS ae see 60°6 
eae Aron. 2): O'0266 ite 11°4 
10°8 11°4 
11°3 11°8 
11°6 
alse 11°4 
110 
11-1 
ar Bg 
