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Selwyn, William in correspondent 
1870-1879::1870::09::02 in date 
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From:
William Selwyn
To:
Sir John Herschel
Date:
[2 September 1870]
Source of text:
RS:HS 15.512
Summary:

Has been trying to make pendulum curves. Believes they may help explain the different sunspot forms. Thanks JH for the spectroscopic observation memoirs.

Contributor:
John Herschel Project
Document type
Transcription available