Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Attention ESVA Patrons:

The Emilio Segrè Visual Archives’ site is moving soon and adopting an open access approach to digital image sharing. Once we have transitioned to the new site in 2021, we will no longer charge for our high-resolution digital images or usage fees (note that we do not hold copyright to all the images in our collections and you will still need to obtain permission for those which we do not own).

If you are working on a long-term project, we advise you to wait until the migration is complete so that you may obtain our copies for free. If you cannot wait, email us at nbl [at] aip.org and we will do what we can to assist you. We will not be offering refunds for past purchases.

For more information, please visit our FAQ page on the Ex Libris Universum blog. 

Kowarski Lew F4

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Kowarski Lew F4

Image title: 
Zero Energy Experimental Pile (ZEEP) reactor at Chalk River, Ontario
Credit line: 
AIP Emilio Segrè Visual Archives, Kowarski Collection

The heavy water tank and pump (moderator dump tank/D20 deuterium oxide) below the floor of the Zero Energy Experimental Pile (ZEEP) reactor in Chalk River, Ontario.

Photo date: 
July 10, 1945
Original format: 
1 photographic print (black and white; 4 x 3 inches)
Kowarski, Lew