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Schumacher, Heinrich Christian in correspondent 
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From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
1821-4
Source of text:
RS:HS 18.10f & 19.11
Summary:

HS was elected associate of Astronomical Society. This year's prize relates to theory of Saturn's satellites. Does HS plan to continue his table of apparent places of fixed stars?

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[17 April 1821]
Source of text:
RS:HS 15.367
Summary:

Thanks for honor conferred by Astronomical Society. Mentions [F. W.] Bessel's paper on the 4th satellite of Saturn. Calculated tables of apparent places of 45 stars, which HS plans to publish annually.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[25 June 1821]
Source of text:
RS:HS 15.368
Summary:

Sends invitation to participate in an astronomical journal. Asks JH to forward letter to [F.] Fallows at the Cape of Good Hope. Mentions [Thomas] Young's plans to travel. Requests that JH forward letters to [W. H.] Wollaston, [John] Brinkley, [David] Brewster, and [Henry] Kater. Encloses announcement of founding of Astronomische Abhandlungen and of Astronomische Nachrichten.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
1821-[8]
Source of text:
RS:HS 19.11
Summary:

JH willing to communicate with HS on worthwhile matters. Subscribes Astronomical Society to HS's Astronomische Nachrichten. Explains 'Prize Question.' Requests copy of F. W. Bessel's essay on fourth satellite of Saturn. Society resolved to print 'daily tables of 46 stars.'

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[5 October 1821]
Source of text:
RS:HS 15.369
Summary:

Thanks for forwarding notice on journal to [F.] Fallows. Hopes to use the longitudinal differences of English observations to improve observations.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
[20 December 1822]
Source of text:
DMC.695A.885.1117
Summary:

Requests that HS look for a shipment of a clock and send it on to J. J. Littrow, and inform the maker in London, Robert Molyneux, that HS has done this. JH sends along John Pond's catalogue of star position differences.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[8 August 1823]
Source of text:
RS:HS 15.370
Summary:

[J. W. A.] Pfaff plans to publish a translation and edition of all William Herschel's papers. Requests a catalogue of those papers and permission to publish a biography of his later years.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[1823-10 or earlier]
Source of text:
RS:HS 19.10
Summary:

Please forward biography of WH and a list of WH's papers to J. W. A. Pfaff, who plans to translate William Herschel's works into German.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
[20] October 1823
Source of text:
RS:HS 19.11
Summary:

Sends packet of books and papers for delivery to J. W. A. Pfaff, copy of JH's 'Essay on Physical Astronomy,' and JH's and James South's work on double stars. Promises to send biographical notice of William Herschel. Astronomical Society received HS's 'Schreiben en Dr. Olbers.'

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[22 November 1823]
Source of text:
RS:HS 15.371
Summary:

Thanks for forwarded essay on physical astronomy. Remarks about method for precisely determining the power of a telescope. Has [C. L.] Harding's celestial atlas. Wanted to dedicate book to Astronomical Society, but asks privately whether permission is necessary.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
[15 January 1824]
Source of text:
RS:HS 19.11
Summary:

Orders missing issues of Astronomische Nachrichten. Answers HS's question about JH's essay on Physical Astronomy. James South's testimony 'vindicated' Josef Fraunhofer's repeating micrometer to Edward Troughton. C. F. Gauss's mode of determining powers of telescopes. Nothing heard of Captain [Maughan?]. Directions for sending [K. L.] 'Harding's atlas' to JH. Gives J. F. Daniell's address. Astronomical Society is gratified that HS dedicated book to it. Shall direct Robert Molyneux to send L. A. Fallon's clock to HS.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[20 January 1824]
Source of text:
RS:HS 15.372
Summary:

Will forward Astronomische Nachrichten to JH and Astronomical Society. Comments on quality of [Joseph] Fraunhofer's micrometer, which has only the wires illuminated. [C. F.] Gauss uses a theodolite to determine the angle of the telescope.

Contributor:
John Herschel Project
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
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[18 June 1832]
Source of text:
RS:HS 15.374
Summary:

Sends news of a cholera epidemic to help JH make his summer plans. Mentions a number of new cases from Altona, Hamburg, and Berlin. Asks JH not to spread information.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[22 June 1832]
Source of text:
RS:HS 15.375
Summary:

Sends two bottles of Claret and a box to be forwarded for [Francis] Baily.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
[24 February 1835]
Source of text:
RS:HS 25.4.8
Summary:

Describes JH's location at the Cape and his observational sweeps, lists nebulae and double stars, as well as comet and eclipse observations. [Letter finished on 1835-3-5.]

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[5 March 1835]
Source of text:
RS:HS 15.376
Summary:

[Otto] Rosenberger has calculated perturbations of Halley's Comet by the inner planets. [Wilhelm] Beer and [J. H.] Mädler have a map of the moon and have located two moving spots on Jupiter. F. W. Bessel's assistant has reduced James Bradley's observation to constants of aberration and nutation.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[9 July 1835]
Source of text:
RS:HS 15.377
Summary:

Visits F. W. Bessel in Berlin to discuss pendulum experiments. [C. A.] Steinheil invented a photometer to measure relative light of different stars.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[17 July 1838]
Source of text:
RS:HS 15.378
Summary:

Received JH's note from Belvedere Hotel. Mentions various arrangements regarding JH's European journey, including JH's planned visit to Wilhelm Olbers.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[19 July 1838]
Source of text:
RS:HS 15.379
Summary:

Unless other responsibilities interfere, HS will meet JH in Bremen.

Contributor:
John Herschel Project