Scrr\ 



Screer\ 



MAGNETIC DEFLECTION OF RADIUM RAYS 



The radium rays are made to strike a screen, producing visible spots of light. When a magnetic field is applied the rays are seen to 

 be deflected, as in the diagram. This can only happen if the rays carry an electric charge, and it was by experiments of this kind that 

 we obtained our knowledge respecting the electric charges carried by radium rays. 



Keprodiued by permiision of Scientific American. 



PROFESSOR R. A. MILLIKA.Vs APPARATUS FOR COUNTING ELECTRONS 



