From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[21 July 1846]
Source of text:
RS:HS 6.229
Summary:
By which of JH's photographic processes can drawings be made permanent? Hopes printing goes on well.
Contributor:
John Herschel Project
By which of JH's photographic processes can drawings be made permanent? Hopes printing goes on well.