216 Mr. M. Ishino on Velocity of Secondary Cathode Rays 



to the (3 rays produced from the gauzes by the Rontgen 

 rays. 



Consequently, the currents due to the secondary cathode 

 rays only can be obtained by subtracting the residual 

 currents from the observed currents. The results so cor- 

 rected are given in Table -III. for air. the mean value of the 

 currents over the range v = 1100 to 1990 volts being taken 

 as the residual current for each case. The current for each 

 value of v indicates the relative number of the secondary 

 corpuscles whose energies are greater than the v volts con- 

 cerned, the total number of the corpuscles being taken 

 as 100. 



Table III. — Air. 



Telocity of 

 Primary 

 Rays. , 

 volts. 

 v=0 



- 14,500 



volts. 



1000 



12,600 



volts. 



1000 



11,200 



volts. 



100-0 



10.500 

 volts. 



100-0 



8100 

 volts. 



ioo-o 



7000 



volts. 



1000 



Mean. 

 1000 



0-3 



945 



95-1 



96-2 



97-4 



98-4 



96-3 



963 



0-5 



89-0 



91-2 



90 4 



936 



91-2 



92-6 



90-9 



0-7 



76-9 



82-7 



84-5 



87-0 



836 



82-6 



82-9 



1-0 



74-3 



74-6 



73-6 



75-8 



75-6 



74-4 



74-7 



15 



60-4 



621 



64-1 



62-5 



621 



62-7 



62-3 



20 



56-2 



57-6 



58-5 



56-4 



59-2 



56-9 



57-5 



25 



481 



51-9 



51-1 



51-1 



50-0 



521 



50-7 



3 



45-2 



48-2 



46-6 



47-1 



47-1 



49-1 



472 



4 



40-0 



41-0 



40-3 



39-3 



410 



441 



410 



5 



354 



364 



37-1 



37-0 



357 



38-0 



366 



6 



30-4 



33-9 



32-8 



32-6 



33-4 



32-8 



32-7 



7 



28-5 



30-4 



31-0 



29-7 



30-8 



30-0 



301 



8 



25-3 



27-3 



27-1 



27-1 



279 



25-8 



268 



10 



223 



23-2 



22 5 



23-8 



22-4 



220 



22-7 



14 



17-9 



18-1 



18-7 



197 



183 



18-9 



18-6 



20 



13-1 



12-6 



124 



14-1 



13-2 



130 



13-1 



30 



9-66 



10-38 



9-88 



10-90 



10-65 



10-65 



10-38 



40 



8-02 



8-16 



8-31 



8-44 



7-24 



8-75 



8-32 



70 



5-44 



5-25 



497 



533 



4-89 



5-59 



5-25 



110 



3-20 



3-35 



3-64 



3-72 



3-99 



3-71 



360 



150 



262 



254 



3-25 



2-58 



3-16 



2-60 



2-79 



190 



2-24 



2-54 



2-61 



211 



2-46 



1-52 



2-25 



270 



213 



217 



1-88 



1-49 



167 



1-37 



1-78 



390 



1-57 



1-24 



1-45 



1-18 



109 



113 



1-28 



590 



0-955 



1-02 



1-03 



062 



0-81 



0-60 



0-839 



790 



0-494 



0-251 



0-411 



0-214 



0-319 



0253 



0324 



990 



0133 



0-044 



0-151 



0-032 



0117 



0-147 



0104 



1190 































1390 































1590 































1990 































