William Francis Gray
Swann

National Bureau of Standards


Ernest O.
Lawrence

UC Berkeley




Hans
Geiger

Technische Hochschule Berlin


James
Chadwick

Cambridge


Harold
Walke

Liverpool University




Arthur
Schuster

University of Manchester




Eilhard Ernst Gustav
Wiedemann

University of Erlangen




Hans
Geiger

Technische Hochschule Berlin


James
Chadwick

Cambridge


John Riley
Holt

Liverpool University

Albert Edward
Litherland

University of Toronto
(Options)

Ilia
Tomski

University of Toronto

David W. O.
Rogers

Carleton University

Albert LitherlandX