Search: Herschel, John in correspondent 
De Morgan, Augustus in correspondent 
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1840-1849::1846::07 in date 
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Herschel6952

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

Herschel6953

From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[23 July 1846]
Source of text:
RS:HS 22.276
Summary:

Describes several photographic processes.

Contributor:
John Herschel Project
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