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Herschel2993

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[11 August 1823]
Source of text:
RS:HS 17.105
Summary:

Thanks JH for having been nominated to England's Astronomical Society. Notes that his results on double stars agree with those of JH and James South. Eagerly awaits new 14-foot achromatic telescope.

Contributor:
John Herschel Project

Herschel2994

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[24 January 1825]
Source of text:
RS:HS 17.106a (C: RS:HS 20.196)
Summary:

Asks WS for account of the performance of his new [Josef] Fraunhofer telescope. Corroborates WS's double star motion data, except for 70 Ophiuchi, where JH and [James] South find no motion. Asks for observational targets and urges care in WS's observational technique. Mentions WS's intention to undertake celestial zone with [F. W.] Bessel. Describes [Henry] Kater's 'floating collimator.'

Contributor:
John Herschel Project

Herschel2995

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[9 April 1825]
Source of text:
RS:HS 17.107
Summary:

Illegible.

Contributor:
John Herschel Project

Herschel2996

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[3 May 1826]
Source of text:
RS:HS 17.108
Summary:

Offers to participate in determining stellar parallaxes by finding the angle position of double stars. Apprises Henry Kater that he has never seen Saturn's rings separated. Includes micrometer measurements of Saturn and Jupiter.

Contributor:
John Herschel Project

Herschel2997

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[4 November 1826]
Source of text:
RS:HS 17.109
Summary:

Mentions a four month absence from Dorpat. Commends [James] South on his work on double stars yet states that South's distances for nearby stars are too large. Considers his measurements, previous to his [Josef] Fraunhofer telescope, significant, even if South refuses to accept them. Thanks JH for the difference in the longitudinal measurements between Paris and Greenwich.

Contributor:
John Herschel Project

Herschel2998

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[9 December 1826]
Source of text:
RS:HS 17.110
Summary:

Interested in JH's catalogue of dimmer double stars. Worries about determining parallax of very close stars. Points out mistake in JH's formula for determining 'the maxima and minima of the position angles.' Informs JH of German translation of William Herschel's writings, Wilhelm Herschels sämmtliche Schriften.

Contributor:
John Herschel Project

Herschel2999

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[3 January 1827]
Source of text:
RS:HS 17.111a (C RS:HS 20.243)
Summary:

May not be able to separate double stars with the twenty foot reflector. Is reviewing nebulae. Regrets [Josef] Fraunhofer did not live to see WS's work. Speaks of standard catalogue of 2881 stars as joint labor of all observatories. Interested in bright stars with minute companions.

Contributor:
John Herschel Project

Herschel3001

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[19 July 1827]
Source of text:
RS:HS 17.112
Summary:

Announces eight copies of his Catalogus novus stellarum duplicium et multiplicium are being sent. Has delegated some work on double stars to his aid [E. W.] Preuß.

Contributor:
John Herschel Project

Herschel3002

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[19 December 1827]
Source of text:
RS:HS 17.113 (C: RS:HS 20.267)
Summary:

Has more leisure after resigning as Secretary to the Royal Society. Is sending his and [James] South's magnitude scales and positions of observation for WS to compare. Lists common double stars and offers means of comparison. Remarks on 'new star,' the fifth star in the trapezoid of Orion.

Contributor:
John Herschel Project

Herschel3003

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[22 December 1827]
Source of text:
RS:HS 17.114
Summary:

Surprised and grateful for JH's encouragement concerning his Stellarum duplicium. Informs JH that the observatory survived the fire at Abo. The university is moving to Helsingfors, Finland. [F. W. A.] Argelander will remain and is working on determining delineations of the foundation stars.

Contributor:
John Herschel Project

Herschel3004

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[6 May 1828]
Source of text:
RS:HS 17.115
Summary:

Accepts JH's extension of Class I double stars. Comments on comparison of these and suggests comparison of respective scales might be mutually useful. Includes continuation of work on micrometer measurements of Saturn. Notices strange eccentricity of Saturn's rings. Is considering comparing his degree-measurements with Finland and Lapland.

Contributor:
John Herschel Project

Herschel3005

From:
Sir John Herschel
To:
Wilhelm Struve
Date:
[6 July 1828]
Source of text:
RS:HS 17.115b
Summary:

Lists contents of a letter sent on 1828-7-6. JH's Light and third catalogue of double stars sent. Details of nebulae included.

Contributor:
John Herschel Project

Herschel3006

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[10 March 1830]
Source of text:
RS:HS 17.116
Summary:

Hopes to meet JH and [James] South in summer. Announces emperor's decision to support measurement of the 3.5° latitude meridian throughout the entire Russian empire. WS is responsible for directing work in the north. Emphasizes the importance of maintaining correct linear standards uniform with both France and England. Requests a copy of the English standard so as to compare it with the Russian measurements of degrees.

Contributor:
John Herschel Project

Herschel3007

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[1 May 1830]
Source of text:
RS:HS 17.117
Summary:

Requests advice in determining optimal time for visit to England. Thanks for invitation to Slough. Mentions completion of his sixth volume of observations, the introduction of which could prove interesting to JH. Fascinated by JH's observation of a sixth star in the trapezoid of Orion.

Contributor:
John Herschel Project

Herschel3008

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[22 June 1830]
Source of text:
RS:HS 17.118
Summary:

Will arrive in England in mid-August. Mentions convention of German scientists on 18 September and invites JH.

Contributor:
John Herschel Project

Herschel3009

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[7 August 1830]
Source of text:
RS:HS 17.119
Summary:

Briefs JH on his productive Paris visit and offers details concerning his upcoming England visit.

Contributor:
John Herschel Project

Herschel3010

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[4 September 1830]
Source of text:
RS:HS 17.120
Summary:

Deeply regrets having missed JH before departure. Thanks for priceless gift of William Herschel's works and for the glimpses of nebulae. Requests his catalogue on noteworthy nebulae when completed.

Contributor:
John Herschel Project

Herschel3011

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[16 October 1830]
Source of text:
RS:HS 17.121
Summary:

Reminds WS to select certain nebulae for 'communal observation.' Received good news from Finland. Gave [James] South the list of 36 double stars to be observed. Stars compare except result in smaller distances than JH's and South's observations.

Contributor:
John Herschel Project

Herschel3012

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[17 March 1832]
Source of text:
RS:HS 17.122
Summary:

Asks JH to thank Henry Kater for his comparison of WS's scale to that of the standard-yard. Mentions breakout of cholera as reason for delay in responding. Includes many measurements of year's work.

Contributor:
John Herschel Project

Herschel3013

From:
Wilhelm Struve
To:
Sir John Herschel
Date:
[4 January 1833]
Source of text:
RS:HS 17.123
Summary:

Mentions [James] South's visit to Dorpat. Includes his observations of the past year. Concedes that JH saw Biela's comet first.

Contributor:
John Herschel Project
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