From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[9 July 1835]
Source of text:
RS:HS 15.377
Summary:
Visits F. W. Bessel in Berlin to discuss pendulum experiments. [C. A.] Steinheil invented a photometer to measure relative light of different stars.
Contributor:
John Herschel Project