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1820-1829::1826 in date 
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Herschel1375

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[1826-1]
Source of text:
RS:HS 17.324
Summary:

Comments on several experiments with spectra passing through glass films.

Contributor:
John Herschel Project

Herschel14697

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[18 November 1826]
Source of text:
TxU:H/M-0691.2; Reel 1084
Summary:

[Addition to Mary Baldwin's letter.] Health of JH's uncle. Travels through volcanic country of Vivarais. Asks CH to purchase for JH 10 copies of the first volume of William Herschel's works, recently translated into German. Sent to CH six copies of JH's 'Account of a Series of Observations Made with a 20-feet Reflecting Telescope' (1826) via Mr. Golterman, and six copies of JH's 'On the Parallax of the Fixed Stars' (1826) via Capt. Müller. James South received Copley Medal this year. Asks about comet near sun on 18 Nov.

Contributor:
John Herschel Project

Herschel1521

From:
Sir John Herschel
To:
Thomas Hodgkin
Date:
[24 January 1826]
Source of text:
WT.Ho A.1
Summary:

Is making arrangements to meet with TH in London.

Contributor:
John Herschel Project

Herschel1548

From:
Sir John Herschel
To:
Charles Babbage
Date:
[14 December 1826]
Source of text:
BL Aaa 32293.384
Summary:

Tells CB of the mistake on the certificate for admission [to the R.S.L.?] for Mr. Moreau, which meant it had to be withdrawn. Doubts that reapplication would be successful. Other news from London.

Contributor:
John Herschel Project

Herschel1960

From:
Johann Franz Encke
To:
Sir John Herschel
Date:
[30 May 1826]
Source of text:
TxU:H/M-0180; Reel 1087
Summary:

Will send JH some barometric observations; describes the barometers with which the observations were made.

Contributor:
John Herschel Project

Herschel2056

From:
John Ramage
To:
Sir John Herschel
Date:
[29 May 1826]
Source of text:
RS:HS 14.298
Summary:

Discusses casting and construction of telescope speculae.

Contributor:
John Herschel Project

Herschel2057

From:
John Ramage
To:
Sir John Herschel
Date:
[30 September 1826]
Source of text:
RS:HS 14.299
Summary:

Discusses construction of his 20-foot reflecting telescope, which he modeled after the 40-foot reflector at Slough. Discusses differences of gallery and asks for advice.

Contributor:
John Herschel Project

Herschel2058

From:
Sir John Herschel
To:
John Ramage
Date:
[12 November 1826]
Source of text:
RS:HS 14.300 (C: RS:HS 20.241)
Summary:

Discusses the construction of JR's telescope. Mentions a number of material changes that must be made if it is to be used for sweeping [see JR's 1826-9-30].

Contributor:
John Herschel Project

Herschel2102

From:
William Ritchie
To:
Sir John Herschel
Date:
[14 December 1826]
Source of text:
RS:HS 14.350
Summary:

Heard election for position in London will not take place for several weeks. If JH can secure situation in Virginia for WR, WR will accept it.

Contributor:
John Herschel Project

Herschel2691

From:
William Somerville
To:
Sir John Herschel
Date:
[17 July 1826]
Source of text:
RS:HS 16.383
Summary:

Accepts dinner invitation. Hopes no emergencies arise that would prevent their visit.

Contributor:
John Herschel Project

Herschel2692

From:
William Somerville
To:
Sir John Herschel
Date:
[2 August 1826]
Source of text:
RS:HS 16.384
Summary:

If possible, send a magnetic needle and the prescription for mixing chrome green paint for Mrs. Somerville. Enjoyed visiting JH's mother.

Contributor:
John Herschel Project

Herschel2693

From:
Sir John Herschel
To:
William Somerville
Date:
[4 August 1826]
Source of text:
RS:HS 16.385 (C: RS:HS 20.236)
Summary:

Sends directions for chrome solution and the magnetic apparatus and instructions for its use, as requested [in WS's 1826-8-2]. Discusses experiments with magnets.

Contributor:
John Herschel Project

Herschel2734

From:
Edward Sabine
To:
Sir John Herschel
Date:
[1826-2]
Source of text:
RS:HS 15.15
Summary:

Encloses a copy of a letter from the astronomer [George] Fisher, who strongly supports the practicability of work in Spitzbergen. Says the letter will be presented to the Council for its consideration in hopes that a special committee will be appointed. Urges JH to show the members the copy.

Contributor:
John Herschel Project

Herschel2735

From:
Sir John Herschel
To:
Edward Sabine
Date:
[23 February 1826]
Source of text:
RS:HS 15.15b
Summary:

Denies any knowledge of a R.S.L. Council meeting. Trusts the council will make its decisions based on public duty and science, not on the fact that the decision must be defended in later discussions. Has passed [George] Fisher's letter on to members as ES requested.

Contributor:
John Herschel Project

Herschel2736

From:
Edward Sabine
To:
Sir John Herschel
Date:
[1826- 2-23 or later
Source of text:
RS:HS 15.16
Summary:

Claims 'it never entered [his] head' that an appointed committee would be influenced solely by the need to defend its decisions. Restates his opinion that the subject should be properly considered.

Contributor:
John Herschel Project

Herschel2737

From:
Edward Sabine
To:
Sir John Herschel
Date:
[1826]
Source of text:
RS:HS 15.17
Summary:

Thanks JH and Charles Babbage for their paper on the magnetic experiments. Asks to have 20 extra copies of the paper on the rocket experiments made when it is printed. Speaks of travel expenses. Mentions [T. F.] Colby's opinions regarding the Spitzbergen measurements.

Contributor:
John Herschel Project

Herschel2865

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[28 February 1826]
Source of text:
RS:HS 20.229 (Abstract: RS:HS 17.106b)
Summary:

Informs WS that the Astronomical Society has voted WS a gold medal for WS's observations of double stars. Says he is now observing nebulae. Confirms receipt of WS's fourth volume of observations sent by [E. C. F.?] Knorre. Asks WS to verify [Henry] Kater's observations on black zones in Saturn's outer ring.

Contributor:
John Herschel Project

Herschel2866

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[29 April 1826]
Source of text:
RS:HS 20.234 (Abstract: RS: RS:HS 17.106c)
Summary:

Sent medal to WS. Tells WS it was awarded to WS and [James] South. Speaks of [Francis] Baily's medal presentation speech. Lists books sent to WS.

Contributor:
John Herschel Project

Herschel2882

From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[30 March 1826]
Source of text:
RS:HS 15.373
Summary:

Announces a new step to all astronomers toward understanding the solar system due to work of [Thomas] Clausen of the Altona observatory. Clausen recognized that the comet discovered by Biela was the same as that of 1805 and 1772. HS gives details of circumstances.

Contributor:
John Herschel Project

Herschel2996

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[3 May 1826]
Source of text:
RS:HS 17.108
Summary:

Offers to participate in determining stellar parallaxes by finding the angle position of double stars. Apprises Henry Kater that he has never seen Saturn's rings separated. Includes micrometer measurements of Saturn and Jupiter.

Contributor:
John Herschel Project
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