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Herschel, John in addressee 
John Herschel Project in contributor 
letter in document-type 
Sabine, Edward in author 
1840-1849::1847::02::23 in date 
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From:
Edward Sabine
To:
Sir John Herschel
Date:
[23 February 1847]
Source of text:
RS:HS 15.204
Summary:

Copies of 1847-2-20 letter will be sent to observatories utilizing actinometers. Earlier series will be replaced with accurate figures. Suggests method to measure temperature in actinometers.

Contributor:
John Herschel Project
Document type
Transcription available