Search: Herschel, John in correspondent 
Herschel, John in addressee 
letter in document-type 
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Smee, Alfred in author 
1840-1849::1842::12 in date 
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Herschel1672

From:
Alfred Smee
To:
Sir John Herschel
Date:
[2 December 1842]
Source of text:
RS:HS 16.158
Summary:

About chemical solutions used in photography, and problems produced by impurities in photographic paper.

Contributor:
John Herschel Project

Herschel1673

From:
Alfred Smee
To:
Sir John Herschel
Date:
[22 December 1842]
Source of text:
RS:HS 16.159
Summary:

Thanks JH for a specimen of 'mercury type,' which AS describes as he examined it under a microscope.

Contributor:
John Herschel Project
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