Delta Rays from Gases. 



87 



current at the low pressure, for at these pressures the current 

 is never saturated ; ionization by collision occurs before 

 saturation. But if it be assumed that n is proportional to 

 the pressure, its value for low pressures can be determined 

 from observations at high pressures, when saturation is 

 attainable. For the purposes of the tables n is calculated by 



means of this assumption. The 



figures in the 









I 



ABLE 



I.— 



Hydro ger 



L. 











l\ 







; 0-68 



1-24 

 0-18 



1-98 



3-35 



6-32 



7-28 

 0-99 

 0-64 



10-0 



11-7 



174 



2-50 



0-83 



26-3 ! Oalc. 

 3-59 

 0-93 0-59 



n/N 



° 



! 010 



0-28 



0-48 



091 



1-36 

 0-74 



1-68 

 0-79 



V, =1... 



0-465 



(-0-07) 



0-28 



0-37 



0-50 



0-65 



2 



0-651 



(-0-17) 



009 



0-28 



0-42 



0-62 



0-60 



0-71 



0-76 



0-82 



0-93 , 0-69 



3... 



0-768 



(-0-13) 



0-16 



0-25 



0-36 



0-59 



0-58 



0-69 



074 



0-81 



0-91 



| 74 



5... 



0-887 



0-03 



0-21 



0-29 



042 



0-59 



0-58 



0-68 



0-74 



0-80 



091 



0-81 



10... 



0-980 



051 



0-55 



061 



0-57 



0-67 



0-65 



0-74 



0-78 



0-83 



0-93 



089 



20... 



0-997 



1-08 



1-26 



1-10 



0-95 



0-87 



0-83 



0-95 



87 



0-89 



1-01 



0-94 



30... 



1-000 



1-74 



1-77 



1-63 



1-34 



1-08 



1-04 



099 



0-96 



0-93 



1-07 



0-95 



50... 





2-36 



2-53i 2-41 



214 



1-68 



1-61 



1-38 



1-24 



1-07 



1-24 



097 



i 



Ta#le II.— Air 



l/\ 







n/N 







V = l... 



0-465 



o 



0-651 



3... 



0768 



5... 



0-887 



10... 



0980 



20... 



0-997 



30... 



1-000 



50... 



~~ 



035 i 0-76 ! 1-43 



0-10 



0-40 



0-53 

 0-56 

 66 

 0-83 

 0-96 

 104 

 1-33 



0-24 



0-60 

 0-63 

 064 

 0-66 

 0-75 

 0-98 

 119 

 1-55 



0-42 



062 

 0-68 

 0-68 

 0-70 

 0-78 

 0-97 

 1-16 

 1-52 



2-34 ! 2-76 ! 3-63 



0-71 



0-57 

 0-65 

 0-70 

 0-76 

 0-82 

 097 

 1-18 

 1-62 



0-82 



0-60 

 0-67 

 0-67 

 0-70 

 0-78 

 0-94 

 115 

 1-59 



1-16 



460 



1-39 



0-56 

 065 

 0-69 

 0-75 

 0-84 

 0-95 

 112 

 1*55 



0-58 

 067 

 070 

 0-76 

 0-84 

 097 

 114 

 157 



7-75 



2-48 



0-61 

 0-68 

 072 



10-0 

 3-00 



0-66 

 0-70 

 0-71 



0-78! 0-74 



0-86 

 0-93 

 101 

 1-33 



0-81 

 1 0-87 



0-84) 



1 1- 19| 



Calc. 



0-59 

 0-69 

 0-74 

 0-81 

 0-89 

 0-94 

 0-95 

 0-97 



first column give the fraction of the total current * at zero 

 pressure carried by the 8 rays from the electrodes which is 

 obtained with the potential difference in the corresponding 

 row of the first column ; they also give the values of f(V) 



* The d-x&y current is taken to be saturated at 30 volts. It has been 

 noted by several observers that at higher voltages the current decreases, 

 and this decrease has been explained by Bumstead as due to the emission 

 of 3 rays with much higher speeds which cause the emission of the low 

 speed 3 rays. The high speed 3 rays are here left out of account, for 

 though probably much of the ionization is really due to them, they are 

 so few in number and have .-peeds so high compared lo the potentials 

 applied that they do not carry any appreciable portion of the current. 



