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From:
Thomas Young
To:
Sir John Herschel
Date:
[1826 to 1829]
Source of text:
RS:HS 18.356
Summary:

Resolved puzzle about sidereal year, which needs better definition. Error between true and nominal positions prevents TY adopting 'equinoctial time' for chronology investigations.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1826-6 or earlier]
Source of text:
RS:HS 18.358
Summary:

J. J. Littrow's paper in F. X. von Zach's April [Correspondence astronomique, géologique, hydrographique et statistique] is only 'a new hash' of [F. W.] Bessel and no improvement.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1826-6 to 1829-5]
Source of text:
RS:HS 18.359
Summary:

Send plan of furnace to TY or Michael Faraday before tomorrow's committee meeting.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
27 December [1827]
Source of text:
RS:HS 18.338
Summary:

'Our volume is nearly ready.' Problem dating vernal equinoxes before Christ's birth.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[28 March 1828]
Source of text:
RS:HS 18.340
Summary:

Board of Longitude will accomplish nothing by meeting before T. M. Brisbane comes to town, but TY suggests informal discussion, either at TY's or Henry Kater's.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[30 March 1828]
Source of text:
RS:HS 18.341
Summary:

Henry Kater not well [enough to travel] and requests committee meet at Kater's house. TY urges JH to verify W. H. Wollaston's measurement of refraction before republishing JH's essay. Diagrams Christiaan Huygens's principle of refraction. TY is making forms of aplanatic lenses.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
1828-4
Source of text:
RS:HS 18.342
Summary:

Hopes JH will stay for Sunday dinner at TY's before JH visits Dr. Litten. If so, please invite T. M. Brisbane and Francis Baily to join them. Writes formula TY discovered for discontinuous spectra. TY can now communicate with H. W. M. Olbers and T. J. Seebeck via H. C. Schumacher.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1828-5 or earlier]
Source of text:
RS:HS 18.357
Summary:

Board of Longitude would approve providing Lieutenant Forbes with apparatus JH suggested. Inappropriate for any member to address Admiralty separately. Payment of expenses to committee members.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[4 May 1828]
Source of text:
RS:HS 18.343
Summary:

Abandons TY's argument on Mr. Roberts's object glass. Asks JH's help in understanding A. J. Fresnel's calculations of diffraction and Josef Fraunhofer's discontinuous functions.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[13 May 1828]
Source of text:
RS:HS 18.339
Summary:

T. M. Brisbane is in town. Can JH meet him? JH's computations of definite integrals are simpler, more direct than P. S. Laplace's and more conclusive than Leonhard Euler's. Comments on W. H. F. Talbot's letters demonstrating Josef Fraunhofer's theorem.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[24 August 1828]
Source of text:
RS:HS 18.344
Summary:

Sudden demolition of Board of Longitude. TY is left as superintendent [of Nautical Almanac]. Notes quality of J. F. Encke's almanac for 1830. Should English compete with German astronomers, or discontinue almanac supplements? TY's paper on 'Astronomical Chronology' in W. T. Brande's [Quarterly Journal of Science and Art] illustrates JH's equatorial time.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
31] August [1828
Source of text:
RS:HS 18.346
Summary:

Will not hold JH responsible for accuracy of William Richardson's computations. No instructions yet from Admiralty about Nautical Almanac, which goes to press soon. TY will insert JH's equinoctial time. Notes two works by A. F. C. Kollman on harmony and [Beck] on 'thorough-bass.'

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1 September 1828]
Source of text:
RS:HS 18.347
Summary:

Feels responsible for JH refusing to accept Navy's £25 reimbursement. Used JH's [equinoctial] time [in Nautical Almanac supplement], but with different notation. Disagrees that England's scientific reputation depends upon its government. William Richardson is justified in continuing work of late Board of Longitude. Reports meeting in Paris with Jacques Babinet and François Arago.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
3 December [1828]
Source of text:
RS:HS 18.350
Summary:

Problems calculating sun's mean longitude due to movement of perigee. Questions S. D. Poisson's value for sidereal year.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
16 February [1829]
Source of text:
RS:HS 18.348
Summary:

JH's determination of length of equinoctial year will remain for long time. Mrs. Young is delighted to hear of JH's new discovery.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[18 February 1829]
Source of text:
RS:HS 18.349
Summary:

Invites JH to join TY to meet Thomas Henderson at [Davies] Gilbert's party Saturday. T. F. Colby accepted payment from Board of Longitude up to Christmas; Henry Kater would not accept payment beyond dissolution of Board. TY believes JH should accept payment at least from March to June.

Contributor:
John Herschel Project
From:
Thomas Young
To:
Sir John Herschel
Date:
[1829-5 or earlier]
Source of text:
RS:HS 18.353
Summary:

Measurement of moon's diameter and distance. Expects JH will soon have 'official authority over me' and [Nautical Almanac]. Astronomers probably regulate sidereal clock by variable equinox because they cannot find a fixed one. Errors in JH's equinoctial time.

Contributor:
John Herschel Project
Document type
Transcription available