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