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Herschel, John in correspondent 
Gassiot?, John P. in correspondent 
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From:
Sir John Herschel
To:
John P. Gassiot?
Date:
[24 April 1854]
Source of text:
RS MC.5.164
Summary:

Suggests method for obtaining daily photographic record of appearance of sun and its spots.

Contributor:
John Herschel Project
Document type
Transcription available