IONS PRODUCED BY RONTGEN RAYS IN GASES AND VAPOURS. 



Height of fall to k m . 



265 



Tern- Electric 

 perature. field. lst point . 2n d point. 



C. volts/em. cm. cm. 



Time. 



Pressure. 



cm./iec. cm. sec. 



14 

 13 

 15 



13 

 14 



77-4 



38-7 

 77-4 



54-8 



P>THYL CHLORIDE. 



Table I. 



,, , , , f positive ion O'L'9 cm. /.sec. 



Mean values of ft { egative . 28 ,< 



0-28 

 0-26 



0-30 



0-28 



0-29 

 0-30 

 0-30 



0-28 

 0-26 



0-28 

 0-28 



0-28 

 0-29 



Table II. 



15 

 13 



77-4 



38-7 



5-8 



7-7 

 3-9 



5-8 



54-8 



, , f positive ion 0-33 cm. /sec. 

 Mean values of k 7W | egative n . ql 



0- 



The explanation of this double tabulation of values is given later under section 8. 

 VOL. CCIX. A. 2 M 



0-29 

 0-33 



0-32 

 0-30 



0-31 

 0-31 



0-31 



0-32 

 0-32 



