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Herschel, John in correspondent 
Villarceau, [A. J. F.] Yvon in correspondent 
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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