From:
Sir John Herschel
To:
Robert Hunt
Date:
[19 April 1840]
Source of text:
RS:HS 22.49
Summary:
Exchanging further information on several aspects of the photographic process [see RH's 1840-4-15].
Contributor:
John Herschel Project
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Exchanging further information on several aspects of the photographic process [see RH's 1840-4-15].