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Stevenson, Thomas in correspondent 
Herschel, John in author 
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From:
Sir John Herschel
To:
Thomas Stevenson
Date:
[15 June 1860]
Source of text:
NatLibScot MS.785, f.23
Summary:

Thanks TS for TS's publication on lighthouse illumination; adds some of JH's own ideas on the subject.

Contributor:
John Herschel Project
Document type
Transcription available