Search: Herschel, John in correspondent 
Forbes, James David in correspondent 
1840-1849::1847 in date 
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From:
James David Forbes
To:
Sir John Herschel
Date:
[3 February 1847]
Source of text:
St. Andrews LB IV, 193-5 (C: RS:HS 7.308)
Summary:

Comments, after delays due to busyness, on JH's queries on the calibration of actinometers and gives results of experiments.

Contributor:
John Herschel Project
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
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
From:
Sir John Herschel
To:
James David Forbes
Date:
[22 June 1847]
Source of text:
RS:HS 22.320
Summary:

Asks for details of several actinometers.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[18 September 1847]
Source of text:
RAS:JH Archive 10/5.120; Reel 9
Summary:

Gratitude for gift of JH's Cape Results. Just returned from geological tour of highlands with [Bernhard] Studer from Bern [Switzerland]. Hopes to purchase Madame Witte's 'model of the Moon...for Edinburgh,' if it has not been bought in London. Observed Neptune at Oxford in company with U. J. J. Leverrier, J. C. Adams, and Wilhelm Struve.

Contributor:
John Herschel Project