From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[16 April 1850]
Source of text:
RS:HS 15.407
Summary:
Asks JH to accept sunspot observations made over 14 years by the late [J. W.] Pastorff of Altona Observatory. Accompanying micrometrical measurements are worthless due to mounting of telescope.
Contributor:
John Herschel Project