Smithsonian Report, 1941. — Lawrence 



PLATF 5 



1. Anotherearly working model of the "pan" in which the speed of the atomic bullets is generated. Photo, 

 graph by Dr. Donald Cooksey, Assistant Director, Radiation Laboratory. 



2. Thechainbei begins III assume somewhat its presfiil luiiii. I'lioiduraph liy Dr. Donald Cooksey, Assist- 

 ant Director, Radiation Laboratory. 



Two Phases of the Early History of the Cyclotron. 



