Search: Herschel, John in correspondent 
Lloyd, Humphrey in correspondent 
1830-1839::1839::03 in date 
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Herschel1162

From:
Sir John Herschel
To:
Humphrey Lloyd
Date:
1839-3-[15 or earlie
Source of text:
RS:HS 25.14.20
Summary:

Passes on the suggestion, from G. B. Airy, of the use of copper rings for damping the movements of measuring instruments in measuring terrestrial magnetism.

Contributor:
John Herschel Project

Herschel11361

From:
Humphrey Lloyd
To:
Sir John Herschel
Date:
[16 March 1839]
Source of text:
RS:HS 11.269
Summary:

Was pleased to hear of the success of JH's exertions. Comments on the instruments required. Thanks for his communication on the copper ring; will try it with the bifilar. W. H. F. Talbot talks of applying the photographic method to meteorological and magnetical instruments. Encloses a paper.

Contributor:
John Herschel Project
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