Search: Herschel, John in author 
Forbes, James David in correspondent 
1830-1839::1832::08 in date 
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From:
Sir John Herschel
To:
James David Forbes
Date:
[5 August 1832]
Source of text:
St. Andrews 123 (C: RS:HS 25.3.8)
Summary:

Suggests that JF use his instruments to compare the force of solar radiation at high and low elevations. Delineates possible methods for this experimentation, and lists results of similar experiments. Includes further information on the actinometer.

Contributor:
John Herschel Project