CONTEMPORARY ADVANCES IN PHYSICS 



683 



400 



300 



to 



Z" 



200 



100 



VELOCITY IN /VOLTS 



Fig. 6 — Cross-sections of metals of the second column of the periodic table. (R. B. 



Erode; Physical Review.) 



N,« 



40, 



o METHOD OF PART I 

 • METHOD OF PART I 



•' I 



100 150 200 250 300 350 400 450 

 VOLTS 



6 7 8 



VOLTS 



10 11 



12 13 14 15 



Fig. 7 — Cross-section of mercury atom, determined by two methods, of the 

 "Ramsauer" and "Mayer" type ("Part I" and "Part 11") respectively. (T. J. 

 Jones, Physical Review.) 



