292 



Mr Richardson, On the Negative Radiation 



N of corpuscles shot off from unit area of the wire. This 

 expression is 



N = 



R_ 



2mir 



& e-*'* = Affle-*' 9 . 



Negative 

 potential 



IN VOLTS 



Pressure 



in mm. 



of mercury 



Eesistance 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 



•162 



11-35 

 11-355 



4180 



1599 



The number JV of corpuscles from unit area is connected with 

 the saturating current in electrostatic units (C) 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 10 G - log 10 eS = log 10 A + | log 10 - ^030 " 



If we put, for convenience, log 10 C— \ log 10 6 — log 10 3 + 1*5 = y and 

 1/0 = x we may write our equation 



y = a- bopc , 



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— | log 10 #+ 1*023, the abscissae being 1/0 x 10 5 . 

 The curve got is very approximately indeed a straight line ; 



