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DCP-LETT-496F

From:
Charles Robert Darwin
To:
William Lonsdale
Date:
[27 Apr 1839 or earlier]
Source of text:
University Archives (dealers) (3 March 2021, lot 73)
Summary:

Returns Whewell’s presidential address to the Geological Society of London (Whewell 1839), and suggests that ‘rules’ be changed to ‘customs’.

Contributor:
Darwin Correspondence Project
Text Online

Faraday1165b

From:
Michael Faraday
To:
Thomas Carter Galpin
Date:
27 April 1839
Source of text:
RI MS
Summary:

No summary available.

Contributor:
Faraday Project

Herschel8820

From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[27 April 1839]
Source of text:
Science Museum Talbt 1/17 (draft 'altered': RS:HS 17.293a & C: RS:HS 22.12)
Summary:

JH reports his discovery of a highly sensitive paper. Tint continues to deepen with time, as bromine does not. Not prepared to reveal process at present. Is off to Paris.

Contributor:
John Herschel Project

Herschel1345

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[27 April 1839]
Source of text:
RS:HS 17.293
Summary:

More photography comments. Problems with use of hyposulfite fixer. Superiority of English over Daguerreotype in being able to make copies.

Contributor:
John Herschel Project
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