Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

University of Chicago H21

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University of Chicago H21

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We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

Image title: 
Scale Model of CP-1
Credit line: 
Argonne National Laboratory, courtesy of AIP Emilio Segrè Visual Archives

Scale Model of CP-1. (1/2 in. = 1 ft.) The display (No. 1.16-1) shows the first pile, the racquets court in which the pile was located, and significant details of the West Stands of Stagg Field at the University of Chicago. It depicts the historic scene on December 2, 1942, when Dr. Enrico Fermi and associates achieved the first self-sustaining chain reaction and thereby initiated the controlled release of nuclear energy. 

NOTE: This photograph is U.S. Government property and is not copyrightable.

Original format: 
1 photographic print (black and white; 11 x 8.5 inches)