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John Herschel Project in contributor 
Hunt, Robert in addressee 
1840-1849::1842::03 in date 
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From:
Sir John Herschel
To:
Robert Hunt
Date:
[15 March 1842]
Source of text:
George Eastman House, 12.17
Summary:

Believes that the operative rays in JH's thermographic process are neither 'calorific' nor 'thermal'.

Contributor:
John Herschel Project
Addressee
Document type
Transcription available