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Johnstone, John in correspondent 
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From:
John Johnstone
To:
Sir John Herschel
Date:
[8 March 1849]
Source of text:
TxU:H/M-0304; Reel 1087
Summary:

Sends sample of photographic lenses ground by JJ. Asks JH for formula of curvature to admit more light.

Contributor:
John Herschel Project
Collection
Document type
Transcription available