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Villarceau, [A. J. F.] Yvon in correspondent 
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From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[1 April 1849]
Source of text:
RS:HS 17.418
Summary:

Asks for JH's comments on YV's specific double star observations. YV presents the mathematical method he uses to calculate double star orbits, which he had presented to the Paris Académie in 1847, but it was not published.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
[A. J. F.] Yvon Villarceau
Date:
[19 April 1849]
Source of text:
RS:HS 17.418a
Summary:

Has passed YV's memoirs on the calculation of orbits on to G. B. Airy for publication; copies will be sent [see YV's 1849-4-1]. Notes that YV's methods are similar to those of U. J. J. Leverrier.

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[18 May 1849]
Source of text:
RS:HS 17.419
Summary:

Is sending a communication to JH for insertion in the R.A.S.M.N. Seems to be some problem with understanding YV's calculations of the orbits of double stars, so YV explains his method.

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[16 November 1849]
Source of text:
RS:HS 17.420
Summary:

Thanks JH for his interest in YV's work on double stars. YV sends a copy of a note on double stars published in the Académie des Sciences for consideration by the R.A.S. Raises a problem of agreement between Newtonian theory and observational data. YV feels astronomical studies in France are slowing down.

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[20 July 1851]
Source of text:
RS:HS 17.421
Summary:

Appears to be presenting YV's calculations for the orbits of double stars. [Much of this letter is illegible.]

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[11 June 1852]
Source of text:
RS:HS 17.422
Summary:

Is sending a mathematical work on the stability of a moving locomotive, and hopes it will interest JH. YV would like it presented to the R.S.L. Refers to YV's work on double stars.

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[17 November 1864]
Source of text:
RS:HS 17.423
Summary:

Thanks for JH's 'Catalogue of Nebulae.' Comments on the problems of accuracy in YV's meridian instrument due to fluctuating temperatures and other problems. Also refers to geodetic and trigonometric considerations.

Contributor:
John Herschel Project