Smithsonian Report, 1963. — Schwartz 



1. A typical event in the Brookhaven spark chamber showing one of the 29 nau mesons 

 produced by the interaction of neutrinos. (See lower half of fig. 5.) 



2. Tlie 10-ton spark chamber at the Brookhaven Laboratory, used to detect neutrino 

 interactions, showing that there are two kinds of neutrino. 



