Search: John Herschel in collection 
Herschel, John in correspondent 
1850-1859::1856::04::23 in date 
letter in document-type 
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From:
George Biddell Airy
To:
Sir John Herschel
Date:
[23 April 1856]
Source of text:
RS:HS 1.229 (C: RGO 6.216.114)
Summary:

Wants one or more of JH's actinometers. Notes his suggestion about the zenith tube.

Contributor:
John Herschel Project