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1840-1849::1842 in date 
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From:
Sir John Herschel
To:
[William Radcliffe Birt]
Date:
[22 September 1842]
Source of text:
RS:HS 19.97
Summary:

Must complete graphs of barometer curves before B.A.A.S. meeting. Did JH mistakenly include 1837 Bogota Almanac in barometer observations?

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
[William Radcliffe Birt]
Date:
[26 September 1842]
Source of text:
RS:HS 19.98
Summary:

Sends two dozen more papers on barometer graphs. Must have all papers on subject by January. Pleased with WB's lunar observations.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[1842-6]
Source of text:
AdWDDR Bessel 225 (C: RS:HS 22.119)
Summary:

Offers to meet FB at Manchester B.A.A.S. meeting and to bring FB to Collingwood for a quiet visit.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[8 July 1842]
Source of text:
AdWDDR Bessel 225 (C: RS:HS 22.127)
Summary:

Detailed arrangements for FB's visit [see JH's 1842-6].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[20 July 1842]
Source of text:
AdWDDR Bessel 225 (C: RS:HS 22.129)
Summary:

Comments on expected honor from Prussian government and on British rules against officially accepting it.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[1842-7]
Source of text:
AdWDDR Bessel 225
Summary:

Informs FB on how to visit Woolwich Arsenal and Dock Yard.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Mr. Collen
Date:
[17 August 1842]
Source of text:
BostonPubLib Ch.J.6.21
Summary:

Would be pleased to be visited by C to discuss the application regarding glass [lenses] of various algebraic formulae devised by JH. Will also show C some of JH's recent work in photography.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Unidentified
Date:
[25 March 1842]
Source of text:
BostonPubLib Ms. Eng. 204
Summary:

Appreciates receiving the curious fossil, even though JH knows little of such matters.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Roderick Impey Murchison
Date:
[20 March 1842]
Source of text:
Geological Society
Summary:

Responds to RM's request for an analysis of the cause of the difference in climate between Orenburg and Catherineburg in Russia. Agrees that Geological Society can print JH's Alpine memoir.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
[John Frederick Goddard?]
Date:
[23 December 1842]
Source of text:
Manchester Central Library
Summary:

JH mislaid the request for specimens of photography, but now sends them; describes those sent. Explains how to get a copy of JH's paper on photography.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Carl Friedrich Gauss
Date:
[4 September 1842]
Source of text:
NSUB Cod.Ms.Gauss 99 (ACCS 2pp RS:HS 25.6.12)
Summary:

The instructions for making magnetic and meteorological observations are to be revised. JH asks CG's advice about this.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas I. M. Forster
Date:
[13 February 1842]
Source of text:
Bodleian Library, Oxford
Summary:

Has been ill for two months. Will be visited by Dr. Andrew Smith shortly. Hopes TF can come to Collingwood to meet Smith.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
John Lindley
Date:
[3 February 1842]
Source of text:
Royal Botanic Gardens
Summary:

Asks about partially white leaves and about droplets of water forming at the tops of leaves. Has been studying the effects of spectral rays on vegetable colorings.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[21 April 1842]
Source of text:
Science Museum Talbt 1/34
Summary:

Thanks for calotypes involving persons engaged in actions. Gives encouragement to WT's planned photographic tour in Germany. JH has been experimenting regarding color photography.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
the Athenaeum
Date:
[10 August 1842]
Source of text:
Athenaeum, #773 (Aug. 20, 1842), 748
Summary:

Seeks to clear up confusions about various photographic processes, e.g., the Chrysotype process, developed by JH, about which confusions arose from earlier reports on them in the Athenaeum.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Roderick Impey Murchison
Date:
1842
Source of text:
Geological Society Proceedings, 3 (1842), 697-9
Summary:

Offers an explanation of the phenomena of the freezing cave of Illetzkaya Zatchita in Russia.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Francis Baily
Date:
[6 September 1842]
Source of text:
R.A.S.M.N., 6 (1842), 23-4
Summary:

Calls attention to the increase in magnitude of the star Eta Cygni. Mentions some other variable stars.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
J. Coates
Date:
[8 August 1842]
Source of text:
Univ.Coll.London SDUK Papers
Summary:

[To JC as Secretary, Society for the Diffusion of Useful Knowledge:] Thanks for offer to send a copy of Augustus De Morgan's Differential and Integral Calculus.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Whewell
Date:
[6 January 1842]
Source of text:
TC, Camb. Add. Ms.a.20751 (C: RS:HS 22.108)
Summary:

Comments by words and a drawing on WW's statement that WW was trying to 'puff himself out' to fill his new office and house. Also discusses moral philosophy and the theory of causation.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Whewell
Date:
[1842-6]
Source of text:
TC, Camb. Add. Ms.a.20752 (C: RS:HS 22.120)
Summary:

Alerts WW that F. W. Bessel, in very poor health, will attend the Manchester B.A.A.S. meeting. JH plans to bring Bessel to Collingwood after the meeting.

Contributor:
John Herschel Project