From:
Basil Hall
To:
Sir John Herschel
Date:
[3 November 1840]
Source of text:
RS:HS 9.192
Summary:
Wishes JH would lay hands on the memorandum concerning the Zenith observatory on Etna. Explains why JH's theories regarding a point in gunnery do not work in actual practice. Queries the measurement given by JH for the height of Etna.
Contributor:
John Herschel Project