Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

University of Chicago H20

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University of Chicago H20

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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 the first nuclear reactor, Chicago Pile 1. The display depicts the historic scene on December 2, 1942, when the reactor first achieved a self-sustaining chain reaction. Apparatus for withdrawing the emergency control rod "Zip" is in the center of the picture. A rope attached to the rod is tied to the rail of the balcony.

Original format: 
3 photographic prints (black and white; 11 x 8.5 inches)