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1820-1829::1826::09 in date 
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From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[17 September 1826]
Source of text:
Science Museum Talbt 1/3
Summary:

Thanks WT for bringing to JH Josef Fraunhofer's publications and Franz Gruithuisen's plates. Recounts JH's geologizing in France and JH's efforts to measure solar radiation.

Contributor:
John Herschel Project