From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[25 March 1843]
Source of text:
Science Museum Talbt 1/35 (C: RS:HS 22.149)
Summary:
Comments on confusion between observing comet and zodiacal light. Extensive comments on various materials used in a photographic process where negatives change to positives over long time.
Contributor:
John Herschel Project