E. G. Butts

John F. Curtin

Curtin worked in the United States Engineer District Office.

H. J. McFarland

James McIntosh

James McIntosh was a draftsman at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Daniel Friel

Daniel D. Friel was a chemical engineer for the DuPont Company who joined the Manhattan Project at the University of Chicago in 1943.