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File:Argonne history At the controls of Chicago Pile-3.jpg

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Fred Cokeing, pile operator with the longest experience at the lab, operates the controls as CP-3 makes its last irradiation. The Laboratory Director (Walter Zinn), who first made this machine critical May 15, 1944, presses the button which closes it down for good.

Photo courtesy <a href="http://www.anl.gov/" rel="nofollow">Argonne National Laboratory.</a>

Neg. No. 201-663
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Source Flickr: Argonne history: At the controls of Chicago Pile-3
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