Search: Herschel, John in correspondent 
Talbot, William Henry Fox in correspondent 
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letter in document-type 
Herschel, John in author 
1840-1849::1843 in date 
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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
From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[31 March 1843]
Source of text:
Science Museum Talbt 1/36 (C: RS:HS 22.151)
Summary:

Zodiacal light is a real phenomenon. Further comments on negative to positive process. Questions whether WT can define one cometary orbit with two observations.

Contributor:
John Herschel Project