Smithsonian Report, 1933. — Compton 



Plate 3 



A Model OF the Van de graaff Generator Built by Dr. Merle Tuve at the 

 Department of Terrestrial Magnetism of the Carnegie Institution 

 OF Washington. 



It lias :i <i-f()ol spliere ami is .shown willi an X-ray lube tdnncclcil bclwccii Ihc terminal ami tlii' earth. 

 lis outdoor oijeralion has been itilerrtipled bj- the bugs and fireOies drawn to the sphere. 



