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Young, Thomas in correspondent 
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From:
Thomas Young
To:
Sir John Herschel
Date:
[1820 or 1825]-2-18
Source of text:
RS:HS 18.351
Summary:

Gives diagram and explanation of TY's reduced parallax. JH's formula is elaborate but complicated. TY's formula is less exact but easier for public to use. Welcomes criticism.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[31 December 1821]
Source of text:
RS:HS 18.320
Summary:

Board of Longitude will meet on 3 Jan. to examine instruments and proposals, and to consider Fearon Fallows's report from Cape of Good Hope.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[7 February 1822]
Source of text:
RS:HS 18.321
Summary:

Board of Longitude reluctant to pay for new building at James South's unless South and JH agree to place their observations at Board's disposal.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[25 March 1822]
Source of text:
RS:HS 18.322
Summary:

Next meeting of Board of Longitude.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1822-4[
Source of text:
RS:HS 18.324
Summary:

Asks JH to check accuracy of Nautical Almanac entry for Jupiter's satellites III and IV on 20 Aug. 1819. Thanks for JH's note, but tell James South 'he is bound to give his reasons....'

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[4 April 1822]
Source of text:
RS:HS 18.323
Summary:

Fears JH misunderstood TY's remark about the injustice of James South's accusation regarding Nautical Almanac. TY was not trying to provoke South's hostility. Sends 'Schumacher's No. 10' for JH's perusal.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Young
Date:
[2 August 1822]
Source of text:
RS:HS 19.24 (C: RS:HS B28.4)
Summary:

Leaving for two weeks in Netherlands.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[4 August 1822]
Source of text:
RS:HS 18.325
Summary:

Has no errands for JH in Holland or Flanders. Asks for details on JH's and Charles Babbage's method of determining heights by barometrical observations. Hopes to use this to confirm TY's method by 'my formula deduced from refraction.'

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
3 January [1823]
Source of text:
RS:HS 18.352
Summary:

Sends papers for R.A.S. and A. J. Fresnel's papers. Modifies analogy of infinite pipes to clarify TY's hypothesis of three principal colors. Charles Babbage sent survey of Mont Cenis. Can JH find its barometrical observations?

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[26 November 1823]
Source of text:
RS:HS 18.326
Summary:

Board of Longitude will meet at TY's home on Saturday.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1824 to 1829]
Source of text:
RS:HS 18.355
Summary:

JH is correct, and TY's 'little man is wrong.' Moon's apparent angular motion increases as spectator moves closer.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Young
Date:
[4 November 1824]
Source of text:
TxU:H/L-0513; Reel 1055
Summary:

JH carried portable barometer by Edward Troughton and thermometer by Mr. Newman to Europe and compared these to instruments used by individual scientists and observatories. Reports results to Board of Longitude.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[18 November 1824]
Source of text:
RS:HS 18.327
Summary:

Repeat computation for Jupiter's satellite IV [see TY's 1824-4]. Explains W. H. Wollaston's 'blue bow.' See figure 422 of TY's [Lectures on Natural Philosophy].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Young
Date:
[1824-11-21 to 1825]
Source of text:
RS:HS 18.330 (C: 20.176)
Summary:

Thanks TY for books and for taking charge of [G. A. A.] Plana's plates. JH mentioned Eilhard Mitscherlich only when no other proposals came forth. Matter was left hanging. Assures TY that JH was not offended [see TY's 1824-11-21, i.e., #1075]. Regrets 'dilapidated state of scientific matters' in R.S.L.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1824-11-21 to 1825]
Source of text:
RS:HS 18.328
Summary:

As R.S.L. vice president, JH should reconsider his report favoring Eilhard Mitscherlich over W. H. Wollaston. This may be last opportunity to pay Wollaston a 'just compliment.' Agrees with JH that much in R.S.L. 'nicknamed science [is] sleight of hand,' and that 'great injustice is done to men of science.' But TY expects a short life and tries not to be concerned about approval of others.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1824-11-21 to 1825]
Source of text:
RS:HS 18.329
Summary:

TY would rather have JH's labor made useful another year. W. H. Wollaston does not want [Royal] medal, but medal wants Wollaston. One council member felt that TY's remarks offended JH. Assures JH it was not intended.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1824-11-21 to 1825]
Source of text:
RS:HS 18.331
Summary:

Math is flimsy in John Dalton's theory of vapor dispersion, but physical grounds are firm. Sends copy of TY's volume on sound. Modules of elasticity and tension are analogies to explain TY's doctrine. Presently studying modules of elasticity that do not apply to chimney pipes investigated by Daniel Bernoulli and J. H. Lambert.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[19 May 1825]
Source of text:
TxU:H/M-0612; Reel 1086
Summary:

Announces 2 June meeting of 'Commissioners for more effectually discovering the Longitude at Sea.' Inquired about 'excise,' but sees no reason to wait for Navy Board to act.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Young
Date:
[19 June 1825]
Source of text:
RS:HS 18.332 (C: 20.214)
Summary:

Edward Sabine declares that R.S.L. is hostile to ES's interests. If ES makes future claim for compensation, JH wants TY's opinion in writing. Need to order four night glasses for Fairlight Station. Encloses letter from [Richard] Copeland.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[5 November 1825]
Source of text:
RS:HS 18.333
Summary:

Ask Charles Babbage to send tables of logarithms to TY, who will compare them to [Brook] Taylor's. Bets that five errors will be found. Did JH order mountain barometer from [J. F.] Newman? Will inquire about [W. E.] Parry's instruments. Admiralty, not us, should order sextants.

Contributor:
John Herschel Project