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Lassell, William in addressee 
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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
From:
Sir John Herschel
To:
William Lassell
Date:
[28 August 1846]
Source of text:
RS:HS 22.280
Summary:

Comments on WL's observation of the seventh satellite of Saturn as noted in WL's 1846-8-26.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[13 September 1846]
Source of text:
RS:HS 22.283
Summary:

Believes that the observations WL has made are quite sufficient to establish the existence of the seventh satellite of Saturn.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[1 October 1846]
Source of text:
RS:HS 22.285
Summary:

Announces, to WL, the discovery of a new planet beyond Uranus, gives co-ordinates, and urges WL to look for satellites 'with all possible expedition.'

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[1 February 1847]
Source of text:
RS:HS 22.298
Summary:

Ask WL's permission to make reference to WL's sighting of the seventh satellite of Saturn in JH's observations of all the satellites of Saturn.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[19 January 1848]
Source of text:
RS:HS 23.4
Summary:

Urges WL to make public his observations of the seventh satellite of Saturn as Otto Struve is about to announce his observation of the same body.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[22 September 1848]
Source of text:
RS:HS 23.37
Summary:

Is pleased to hear of the discovery of further satellites of Neptune.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[11 October 1848]
Source of text:
RS:HS 23.39
Summary:

Some question of Harvard University observer having observed the satellite [see JH's 1848-9-22] one day before WL.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[15 October 1848]
Source of text:
RS:HS 11.139 & 23.40 & 23.41
Summary:

Criteria for deciding who can claim to be the discoverer of the satellite. [This letter marked 'not sent on second thoughts; see RS:HS 23.41 for letter sent.]

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
1851-11-[4 or later]
Source of text:
RS:HS 25.14.18
Summary:

Suggests names for the satellites of Uranus, in response to a request from WL [see WL's 1851-11-3].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[4 November 1851]
Source of text:
RS:HS 23.109
Summary:

Congratulations to WL on his discovery [see WL's 1851-11-3]; naming should occur once the various satellites have been described and verified.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[28 April 1852]
Source of text:
RS:HS 23.121
Summary:

Is willing to assist in obtaining letters of introduction for WL's projected trip to Malta.

Contributor:
John Herschel Project
From:
Thomas Bell
To:
William Lassell
Date:
2 July 1853
Source of text:
MM/19/110, Royal Society
Summary:

No summary available.

Contributor:
Royal Society
From:
Sir John Herschel
To:
William Lassell
Date:
[21 October 1857]
Source of text:
RS:HS 23.209
Summary:

Is preparing a new edition of Outlines Astr., and would like to know from WL the status of each of the satellites of Uranus and Neptune.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[1 November 1857]
Source of text:
RS:HS 11.151 & 23.212
Summary:

Wishes all success to his proposed visit to Malta. Has been able to find the volumes of R.A.S.M.N. Comments on WL's system of levers for his telescope.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[15 September 1858]
Source of text:
RS:HS 11.153-4 (C: RS:HS 23.239)
Summary:

Is dismayed to find in the new edition of his own Outlines Astr. that he has attributed the discovery of Hyperion to W. R. Dawes without crediting WL; will have this corrected in a future edition.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[27 August 1859]
Source of text:
RS:HS 23.271
Summary:

Asks for details of WL's system of speculum polishing and telescope construction as JH is preparing an article on telescopes for the Encyclopaedia Britannica.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[23 September 1859]
Source of text:
RS:HS 23.278 (extract 1p Harvard: Houghton AAH 67m-67 {48})
Summary:

Comments on WL's information on telescope construction, and adds some of JH's own experience.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[11 February 1860]
Source of text:
RS:HS 23.297
Summary:

Comments on WL's 4-foot equatorial telescope of which WL sent JH a lithograph [see WL's 1860-2-8].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Lassell
Date:
[13 November 1860]
Source of text:
RS:HS 23.317
Summary:

Comments on WL's nebulae diagrams and asks for more.

Contributor:
John Herschel Project