Search: Herschel, John in correspondent 
letter in document-type 
1840-1849::1842::04::10 in date 
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From:
Sir John Herschel
To:
George Biddell Airy
Date:
[10 April 1842]
Source of text:
RGO 6.463.300
Summary:

Sends GA a spectrum photograph, and explains how JH obtained it.

Contributor:
John Herschel Project