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Collen, Mr. in correspondent 
John Herschel Project in contributor 
1840-1849 in date 
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From:
Sir John Herschel
To:
Mr. Collen
Date:
[22 July 1842]
Source of text:
DMC 695A.885.31
Summary:

Goes into considerable detail in providing information about the business organization of the Munich lens makers, and the high quality of their lenses. Urges the benefits of achromatic lenses, and sends MC some specimens of JH's photography.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Mr. Collen
Date:
[17 August 1842]
Source of text:
BostonPubLib Ch.J.6.21
Summary:

Would be pleased to be visited by C to discuss the application regarding glass [lenses] of various algebraic formulae devised by JH. Will also show C some of JH's recent work in photography.

Contributor:
John Herschel Project
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