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).

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

Johnston Harold B2

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Johnston Harold B2

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Image title: 
Harold S. Johnston poses for photograph with stacked documents
Credit line: 
AIP Emilio Segrè Visual Archives, Gift of Dr. Johnston

Harold Johnston poses for photograph with stacked documents published since 1971 concerning stratospheric ozone and its vulnerability to human perturbation.

Background to picture with three-foot stack of reports and books
September 21, 1971: Quoting from my article, {Harold Johnston. "Reduction of Stratospheric Ozone by Nitrogen Oxide Catalysts from Supersonic Transport Exhaust", Science, 173, 517-522 (1971)} and from other material, Senator Bayh and Senator Church introduced a bill S 2555, " The Stratosphere Protection Act of 1971," which mandated a stratospheric research program. A bill was passed assigning the stratospheric research to the Department of Transportation. Alan Grobecker from the Institute of Defense Analysis was placed in charge of the program.
This project was named the Climatic Impact Assessment Program (CIAP). Its administrative organization was set up in the fall of 1971, and its public activities started with the Survey Conference of February 15-16, 1972. As mandated by the Congress, CIAP terminated at the end of 1975. There was much to learn about the stratosphere, and the period of 1972-1975 was the first golden age of stratospheric research. (The second golden age of stratospheric research followed the discovery of the Antarctic ozone hole in 1985). Among other things, CIAP concluded the nitrogen oxides from stratospheric aircraft would reduce ozone and recommended that aircraft engines be redesigned for a 60-fold reduction in nitrogen oxides from their exhaust. In 1973 CIAP found that chlorine had a strong potential for reducing stratospheric ozone. During 1975 CIAP published six monographs detailing its massive findings.
In Congressional hearings on December 12, 1974 and May 15, 1975, Raymond L. McCarthy, technical manager and laboratory director for the Freon Products Division of E. I. DuPont de Nemours & Co. repeatedly stated at a Congressional hearing, "In fact, there is no experimental evidence supporting the chlorine-ozone theory." In response to the categorical assertions of, "no experimental evidence," I posed for this photograph, in which I stacked documents published since 1971 concerning stratospheric ozone and its vulnerability to human perturbation.

Photo date: 
circa 1975
Original format: 
1 photographic print (black and white; 10 x 8 inches)
Johnston, Harold S.