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Bessel, Friedrich Wilhelm in correspondent 
1830-1839 in date 
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Herschel8533

From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[17 April 1833]
Source of text:
AdWDDR Bessel 225 (ACCS: RS:HS 25.3.13)
Summary:

Requests FB to send JH any observations of Gamma Virginis made by FB. Anxious for these because of differences between JH's and Wilhelm Struve's measurements of Gamma Virginis. Provides JH's new determination of the orbital elements of this object. Thanks FB for publications FB sent. JH's brother-in-law, J[ames Calder] Stewart, may visit FB.

Contributor:
John Herschel Project

Herschel5579

From:
Friedrich Wilhelm Bessel
To:
Sir John Herschel
Date:
[4 July 1834]
Source of text:
RS:HS 4.69
Summary:

Wishes JH well at the Cape; describes some of his current observations.

Contributor:
John Herschel Project

Herschel8534

From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[16 May 1835]
Source of text:
AdWDDR Bessel 225 (ACCS: RS:HS 19.70 & C: RS:HS 25.4.10)
Summary:

FB's letter of 4 July 1834 reached JH in March 1835. Discusses the observability of the sixth and seventh Saturnian satellites. Meteorological observations at sea, at Cape, and from Calcutta lead JH to suspect 'annual transfer of atmospheric pressure' between hemispheres and permanent depression at equator. Describes JH's work at the Cape. Praises Thomas Maclear.

Contributor:
John Herschel Project

Herschel5580

From:
Friedrich Wilhelm Bessel
To:
Sir John Herschel
Date:
[5 June 1838]
Source of text:
RS:HS 4.70
Summary:

Welcomes JH back from Cape; includes results of FB's work on geodesical measurements in East Prussia.

Contributor:
John Herschel Project

Herschel5581

From:
Friedrich Wilhelm Bessel
To:
Sir John Herschel
Date:
[9 October 1838]
Source of text:
RS:HS 4.71
Summary:

Announces the measurement of the annual parallax of 61 Cygni.

Contributor:
John Herschel Project

Herschel8535

From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[24 October 1838]
Source of text:
AdWDDR Bessel 225 (C: RS:HS 21.265)
Summary:

Thanks FB for letter in which FB announces the discovery of annual stellar parallax; JH questions whether effects of temperature have been adequately considered.

Contributor:
John Herschel Project

Herschel5582

From:
Friedrich Wilhelm Bessel
To:
Sir John Herschel
Date:
[4 November 1838]
Source of text:
RS:HS 4.72
Summary:

Responds to concerns about effect of temperature on measurement of stellar parallax [see JH'S 1838-10-24]; comments on other observations.

Contributor:
John Herschel Project

Herschel5583

From:
Friedrich Wilhelm Bessel
To:
Sir John Herschel
Date:
[26 June 1839]
Source of text:
RS:HS 4.73
Summary:

Sending JH some writings on geodesic measurements; reports the second measurement of annual parallax of 61 Cygni; comments on some other observations.

Contributor:
John Herschel Project

Herschel8536

From:
Sir John Herschel
To:
Friedrich Wilhelm Bessel
Date:
[29 December 1839]
Source of text:
AdWDDR Bessel 225 (C: RS:HS 22.35)
Summary:

Thanks FB for a variety of observational material, including establishment of standards of measurement [letter completed 1840-1-3].

Contributor:
John Herschel Project
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