566 Mr. G. Jaffé on the Conductivity of 
Fig. 1. (Bulb 1) 
5 
= 
s 
* 
PBWsi.. 
> 
S 
S) 
t 
& 
y 
Qa 
H 
= 
9 
a 
5 
mn 
SS 
~ 
Q 
ly 
~ 
= 
9 
a 
= 
ne 
vt) 
| 
a 
Fae: 
a 
we 
ing 
/- 
he 
hie 
BEANS: 
100 200 300 400 500 600 700 800 
PRESSURE MM OF MERCURY 
Fig. 2. (Bulb IL.) 5 
LEAH, SCALE D/V/S(IONS PEFR HOU 
800 
lo} 6 
FRESSURE, 4M OF MERCURY 
It sill be seen that the curves show the same characteristic 
properties as in air ; the straight parts, however, extend from 
about 40 mm. to 120 mm. pressure. The coefficients 6 are 
very nearly the same as in air; the constants a, however, are 
about five times as big as in air (2 = 5'0; a 51). As 
2 
1 
the density of nickel-carbonyl is 5°9 times that of air, this 
fact shows that the more penetrating radiation is absorbed by 
different gases about proportionally to their density. 
In fig. 3 the two curves for air and Ni(CQ),in bulb II. are 
plotted in such a way that the abscissze are proportional to the 
density instead of the pressure. It will be noticed that the 
curves very nearly coincide. 
