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Herschel, John in author 
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Herschel1541

From:
Sir John Herschel
To:
Robert Ellis Dudgeon
Date:
[22 January 1871]
Source of text:
APS B.H435p.26 (C: RS:HS 24.348)
Summary:

Comments on use of 'air' lens rather than glass in some circumstances.

Contributor:
John Herschel Project
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