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