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