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. 

Bromley David Allan F1

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Bromley David Allan F1

David Allan Bromley
Image title: 
Kuehner, Bromley and Almvist in Control Room
Credit line: 
AIP Emilio Segrè Visual Archives, Bromley Collection

L-R: John Kuehner, D. Allan Bromley; Einar (Joe) Almvist converse. Caption courtesy D. Allan Bromley: "My research group in the Control Room for the Chalk River 4 MV Van de Graaff accelerator.[...] All of the instrumentation was vacuum-tube based and behind us on the right was a 50-channel multi-channel analyzer, each channel of which had to be separately adjusted at least once a day because the circuitry drifted continually. Our only local laboratory computer at the time was the Marchant desk unit shown here. We were fortunate in having the world's only liter of 3He gas and because we had constructed a suitable recovery system we were able to recycle that liter of gas through the accelerator literally hundreds of times, losing only the 3He nuclei that were eventually driven into target materials. The possession of this 3He gave us a definite advantage over other nuclear physicists worldwide in terms of our ability to study higher-lying states in light nuclei."

Photo date: 
Original format: 
1 photographic print (black and white; 9.5 x 7.25 inches)
Bromley, D. Allan (David Allan), 1926-2005
Kuehner, John Alan
Almqvist, Einar