From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[20 January 1824]
Source of text:
RS:HS 15.372
Summary:
Will forward Astronomische Nachrichten to JH and Astronomical Society. Comments on quality of [Joseph] Fraunhofer's micrometer, which has only the wires illuminated. [C. F.] Gauss uses a theodolite to determine the angle of the telescope.
Contributor:
John Herschel Project