Search: Herschel, John in correspondent 
Forbes, James David in correspondent 
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1840-1849::1847::03 in date 
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Herschel3541

From:
Sir John Herschel
To:
James David Forbes
Date:
[1 March 1847]
Source of text:
St. Andrews 10a (C: RS:HS 22.304)
Summary:

Believes all actinometric measurements made are useless because they did not take into account the rate of expansion of the liquid, which is not constant.

Contributor:
John Herschel Project

Herschel3422

From:
James David Forbes
To:
Sir John Herschel
Date:
[4 March 1847]
Source of text:
St. Andrews LB IV, 214-16 (C: RS:HS 7.309)
Summary:

Sympathizes with JH's feelings of regret over actinometer readings. Has procured a new thermometer and carried out experiments toward correction of actinometers.

Contributor:
John Herschel Project
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