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