222 Mr. E. Jacot on a Relation between Ionization by 



Results. 



The results obtained are tabulated in Table I. The 

 pressures at the beginning of each experiment are given in 

 column 1. The currents passing through the solenoid, pro- 

 portional to the ray velocities, are arranged in column 2. 

 The galvanometer deflexions in the third column are a 

 measure of the number of corpuscles n passing through the 

 ionization-chamber per second during successive experiments. 

 Values of <f> as calculated from the results of each experiment 

 appear in column 4. 



Table I. 



l 



Pressure^, 

 mm. of Hg. 



•080 



•066 



•052 



•041 



•036 



•030 



•025 



•021 



2 



Solen oid 



current, 



amps. 



4-3 



4-7 



4-3 

 4-7 

 5-1 



4-7 

 51 



5-5 



5-1 

 5-5 

 60 



5-5 

 60 

 6-5 



55 

 6-0 

 65 



60 

 6-5 



7-0 



65 

 7-0 



3 



Galvano. 



deflexion. 



9. 



25 

 55 



7-5 

 10-5 

 15 



18 

 19 

 29 



34 

 43 

 50 



52 

 56 



57 



57 

 62 

 03 



71 



77 



101 



111 

 126 



0X1O 4 



6 

 12 



15 

 19 

 19 



25 

 19 

 31 



27 

 35 

 36 



37 

 35 



28 



34 

 33 

 26 



30 



26 

 25 



32 



26 



5 



6 



7 



BX'P 

 prop. 



to up. 



.-xio 1 . 



vp 



E. 



•20 

 •44 



30 



27 



•04 



•08 



•49 

 •69 

 •99 



30 



27 

 20 



•13 

 14 

 •14 



•94 



•99 



1-51 



27 

 20 

 20 



•21 



•18 



•27 



1-39 

 i-76 

 2-05 



20 

 20 

 17 



•32 

 •41 

 •41 



1-87 

 2-02 



2-05 



20 

 17 

 14 



•49 

 •47 

 •37 



1-71 

 1-86 

 1-89 



20 

 18 

 14 



•53 

 •52 

 •32 



1-78 

 1-93 

 2-52 



17 

 14 

 10 



•56 

 •50 

 •48 



2-33 

 265 



14 

 10 



•73 



•59 



In fig. 2 the values of </> have been plotted against the 

 products Op for various velocities of the rays. The curves 

 are straight lines passing when produced through the origin 



