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.

Averbach Emanuel C1

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Averbach Emanuel C1

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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.

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Image title: 
Averbach Demonstrates Experiment
Credit line: 
AIP Emilio Segrè Visual Archives, Physics Today Collection

Dr. Emanuel Averbach describes the letter display and the marker system which has been used in tests of short term memory capacity and characteristics at Bell Telephone Laboratories to Miss Virginia Gregory, while Abner S. Coriell operates the controls of the display system.
Dr. Averbach and Mr. Coriell presented a paper to the Spring 1960 meeting of the Optical Society of America (OSA), describing results of experiments with the equipment which have shown that the eye can "remember" much more information in a short time than would be inferred from asking a subject to "read back" information he has seen in a brief flash. Also, the information stored in the temporary memory can be allowed to fade gradually or can be erased selectively by succeeding stimuli, before the viewer is actually aware of what he has seen.

Photo date: 
Spring 1960
Original format: 
2 photographic prints (black and white; 7.5 x 7.75 inches)
Averbach, Emanuel