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Johnson, Christopher in correspondent 
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From:
Christopher Johnson
To:
Sir John Herschel
Date:
[5 March 1840]
Source of text:
RS:HS 10.446
Summary:

Has just seen JH's communication in the P.M. regarding an improvement to a lamp. Points out that the late Charles Seward obtained a patent for this improvement some thirty years ago.

Contributor:
John Herschel Project
Collection
Document type
Transcription available