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Simpson, G. Wharton in correspondent 
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From:
G. Wharton Simpson
To:
Sir John Herschel
Date:
[7 November 1864]
Source of text:
RAS:JH Archive 13/3.110; Reel 10
Summary:

Photographic News received copies of papers from R.S.P.T. giving evidence of [JH's] use of hyposulfite of soda. Will refer to W. H. F. Talbot on use of bromine, as JH suggested. P. B. Goddard of Philadelphia claims to have used bromine in Daguerreotype process in 1839, but did not announce it publicly until 1843.

Contributor:
John Herschel Project
From:
G. Wharton Simpson
To:
Sir John Herschel
Date:
[12 May 1866]
Source of text:
RS:HS 17.210
Summary:

Wishes to ascertain certain facts for article on history and aspects of photography. Especially, asks where to find first record of JH and [Louis] Daguerre using hyposulfite of soda for fixing photographs.

Contributor:
John Herschel Project
From:
G. Wharton Simpson
To:
Sir John Herschel
Date:
[14 May 1866]
Source of text:
RS:HS 17.211
Summary:

Thanks JH for helping to clarify origins of Louis Daguerre's use of hyposulfite of soda for fixing photographs. Provides further information on photography, particular solar microscope photography.

Contributor:
John Herschel Project
Collection
Document type
Transcription available