Search: Herschel, John in author 
1840-1849::1842 in date 
letter in document-type 
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Herschel1157

From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[1842-8-24 or later]
Source of text:
RS:HS 25.14.14
Summary:

Writes to send thanks by way of AH to the King of Prussia for the award of the Order of Merit. JH also comments on some astronomical matters.

Contributor:
John Herschel Project

Herschel11596

From:
Sir John Herschel
To:
William Lassell
Date:
[20 March 1842]
Source of text:
RS:HS 22.114
Summary:

Comments on WL's finding a sixth star in the trapezium of Orion [see WL's 1842-3-10]; lists other catalogues that identify that star.

Contributor:
John Herschel Project

Herschel11597

From:
Sir John Herschel
To:
Humphrey Lloyd
Date:
[2 September 1842]
Source of text:
RS:HS 22.134
Summary:

Urges some revision in both the report and instructions for the magnetic observations.

Contributor:
John Herschel Project

Herschel1160

From:
Sir John Herschel
To:
Robert Hunt
Date:
[1842-12-9 or later]
Source of text:
RS:HS 25.14.15
Summary:

Is anxious for some means to be developed to get a measurable quantity [preferably by weight] from the action of a beam of light on a surface. JH has been experimenting in photography with 'flouric' compounds.

Contributor:
John Herschel Project

Herschel11911

From:
Sir John Herschel
To:
Johann Heinrich Mädler
Date:
[1842-4]
Source of text:
RS:HS 12.273 & 22.144
Summary:

Is gratified that JM is taking an interest in double stars. Comments on some of the observations and time of their orbits.

Contributor:
John Herschel Project

Herschel12009

From:
Sir John Herschel
To:
Adalbert Adolf Mühry
Date:
[10 November 1842]
Source of text:
RS:HS 12.371 & 22.141
Summary:

Is anxious about his aunt Caroline Herschel and would like news of her health.

Contributor:
John Herschel Project

Herschel1236

From:
Sir John Herschel
To:
Editor of the [Royal Society Philosophical Transactions?]
Date:
[2 November 1842]
Source of text:
RS:HS B26.69
Summary:

Comments on some papers on vision and photography by Mr. Moser, and compares this with some of JH's own writings on the subject.

Contributor:
John Herschel Project

Herschel12645

From:
Sir John Herschel
To:
Mary Baldwin
Date:
[16 September 1842]
Source of text:
TxU:H/L-0065; Reel 1054
Summary:

Birth of JH's ninth child [Julia].

Contributor:
John Herschel Project

Herschel12722

From:
Sir John Herschel
To:
George Dollond
Date:
[15 December 1842]
Source of text:
TxU:H/L-0137; Reel 1054
Summary:

Sends description and drawings of JH's actinoscope. Requests estimate for time and expense of constructing it. Questions about clock mechanism and prisms.

Contributor:
John Herschel Project

Herschel12723

From:
Sir John Herschel
To:
George Dollond
Date:
[25 December 1842]
Source of text:
TxU:H/L-0138; Reel 1054
Summary:

Regrets that GD cannot build JH's entire actinoscope. If GD can make at least mechanical components, JH will supply optics and clockwork. Can GD complete these [by end of March]? Funds are limited; please estimate cost.

Contributor:
John Herschel Project

Herschel12724

From:
Sir John Herschel
To:
George Dollond
Date:
[29 December 1842]
Source of text:
TxU:H/L-0139; Reel 1054
Summary:

Confirms scale of drawings [for JH's actinoscope]. Has found simple contrivance to replace clockwork. Will order lenses and prisms from Munich; all English glass has color aberrations.

Contributor:
John Herschel Project

Herschel12742

From:
Sir John Herschel
To:
James David Forbes
Date:
[15 November 1842]
Source of text:
RS:HS 25.6.15 (C: TxU:H/L-0159; Reel 1054)
Summary:

Received JF's paper on 'thermographic process.' Believes that thermic rays were responsible for experimental results of JF, J. W. Draper, and Ludwig Moser. JH's theory of and experiments with thermic rays, which are different from 'calorific' and visible rays, in solar spectrum.

Contributor:
John Herschel Project

Herschel1279

From:
Sir John Herschel
To:
Henry Goulburn
Date:
[1842-9-16 or later]
Source of text:
RS:HS B27.51
Summary:

Writes to the Chancellor of the Exchequer to give JH's opinion about the probable utility of continuing to spend money on Charles Babbage's calculating machine.

Contributor:
John Herschel Project

Herschel1280

From:
Sir John Herschel
To:
Charles Babbage
Date:
[1842?]
Source of text:
RS:HS B27.52
Summary:

Tells CB about a visit by JH and Wolryche Whitmore to the Duke [of ?] to present the case for more government funds for Charles Babbage's calculating machine.

Contributor:
John Herschel Project

Herschel12806

From:
Sir John Herschel
To:
Joseph Henry Kay
Date:
[19 April 1842]
Source of text:
TxU:H/L-0211; Reel 1054
Summary:

Impressed by accuracy of actinometer measurements made by JK, Joseph Dayman, and P. A. Scott from Feb. to Sept. 1841 at JK's observatory at Rossbank [Tasmania]. Suggests methods to improve readings and simplify reductions.

Contributor:
John Herschel Project

Herschel12889

From:
Sir John Herschel
To:
Unidentified
Date:
[1842]
Source of text:
TxU:H/L-0301; Reel 1054
Summary:

Submit revisions to instructions for conducting and reporting magnetic and meteorological observations.

Contributor:
John Herschel Project

Herschel12949

From:
Sir John Herschel
To:
Edward Sabine
Date:
[23 January 1842]
Source of text:
TxU:H/L-0361; Reel 1054
Summary:

JH's reasons for requesting three-year extension of magnetic and meteorological survey from British government and H.E.I.C. Preliminary results from global stations.

Contributor:
John Herschel Project

Herschel12970

From:
Sir John Herschel
To:
Richard Sheepshanks
Date:
[12 January 1842]
Source of text:
TxU:H/L-0384; Reel 1054 (Cdraft: RS:HS 25.15.11)
Summary:

Is insistent that JH cannot perform the functions of Foreign Secretary [of the R.A.S.] as he has too much to do already, and has had to give up much of his personal scientific correspondence.

Contributor:
John Herschel Project

Herschel13489

From:
Sir John Herschel
To:
Secretary of R.S.L. Physical Committee
Date:
[1842 or later]
Source of text:
TxU:H/L-0722; Reel 1089
Summary:

Offers to provide committee with plans for and to supervise construction of new instrument, devised by JH, for study of solar spectrum.

Contributor:
John Herschel Project

Herschel13539

From:
Sir John Herschel
To:
[Sir] Edward Ryan
Date:
[8 June 1842]
Source of text:
TxU:H/L-0765.3; Reel 1089
Summary:

Welcomes ER back to England. Met ER's host, Charles Babbage, at Greenwich yesterday. Wants to visit before ER departs for Geneva, but JH's wife is ill. Based on accounts of Geneva by ER's wife, JH sent three oldest daughters and their governess to spend summer there.

Contributor:
John Herschel Project
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