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Herschel, John in correspondent 
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From:
Sir John Herschel
To:
Physical Section of the B.A.A.S.
Date:
[31 July 1841]
Source of text:
B.A.A.S. Report for 1841 (1842), pt. 2, 40
Summary:

Submits for inspection fifteen colored photographic copies of engravings and mezzotintos prepared by casting luminous rays on substances prepared from vegetable sources.

Contributor:
John Herschel Project