292 
Mr Richardson , On the Negative Radiation 
N of corpuscles shot off from unit area of the wire, 
expression is 
N = n 
0 * e-V™ = A0h~ b ‘ e . 
This 
Negative 
POTENTIAL 
IN VOLTS 
Pressure 
in mm. 
of mercury 
Resistance of wire 
in ohms 
Saturation 
Current in 
amperes x 10 ~ 7 
Temperature 
in degrees 
centigrade 
111 
•024 
9-725 
9-718 
1-04 
1194 
111 
•044 
10-16 
10-14 
13-62 
1298 
111 
•091 
10-63 
10-61 
116 
1419 
111 
•106 
10-79 
10-75 
578 
1449 
111 
•152 
10-95 
10-91 
1370 
1490 
111 
•18 
11-13 
11-07 
1730 
1533 
110 
1 
•162 
11-35 
11-355 
4180 
1599 
The number N of corpuscles from unit area is connected with 
the saturating current in electrostatic units ( 0 ) by the relation 
C = NeS, e being the charge on an ion and 8 the superficial area 
of the wire. The simplest way of testing the proposed formula is 
to take logs, when we obtain the equation 
log™ C - log 10 eS = log 10 A + i log 10 0 - • 
If we put, for convenience, log 10 C— \ log 10 6 — log 10 3 + T5 = y and 
1/0 = x 0 we may write our equation 
y = a — b 0 x 0 , 
so that plotting the values of y against those of 1/0 should give 
a straight line. In the accompanying graph the ordinates are the 
values of log 10 C— J log 10 0 + T023, the abscissae being 1/0 x 10 5 . 
The curve got is very approximately indeed a straight line ; 
