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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
From:
Johann Franz Encke
To:
Sir John Herschel
Date:
[23 February 1847]
Source of text:
RS:HS 7.97
Summary:

Comments relating to G. W. Leibniz correspondence [see JE's 1846-9-22]; comments on naming the new planet Neptune.

Contributor:
John Herschel Project