NO. 1863 BIBI^IOGRAPHY OF CAXAL RAYS FULCH 



ER 



319 



5 |x iCcm./iec 



00 - Paschen 

 4- i » X - Stark 



15.000 



20.000 VOLTS 24.000 



Fig. 62.— Range of velocities of sources of O spark lines as a function of the 

 cathode fall. Full lined curves calculated from formula (i). 



With He, a third patch may be divided ofif for which maximum 

 e/m = 2.9 X 10' : Tm3(57i). 

 Maximum value of e/m independent of the pressure of gas • 

 Tm3(575). 

 From Doppler effect, assuming the canal rays are the sources of light : 

 For H. e/m = 7,500 for V < 2,000 v. : 813(35, 416) ; Ps2(253). 

 = 3,000 for V > 2,000 V. : Ps2(253). 

 e/m = 500 for V < 3,000 v.: Ps3(264) ; e/m = 584, 823(816). 



= 180 for V > 3,000 V. : Ps3(264). 

 e/m = 500 to 670: Kn3(36, ^y). 

 e/m = 200 : 823 (823 ) . 



As judged from the magnetic deflection, results are of same 

 order for O, H, CO2, He, Ar, and Air: \V6(588) ; 

 Tm3(57S); Tm6(295). 

 Extreme precautions to get rid of H2 do not affect result: Tm7(36i) ; 

 W8(66i). In each gas, however pure, there seem to 

 be besides rays characteristic of the gas (detected by 

 the Doppler effect), also two kinds of rays having a 

 specific charge equal to that of a singly charged hydro- 

 gen molecule and atom respectively: cf. Wio(2i3). 



For O. 



For C. 



For Al 



In general. 



