From:
Sir John Herschel
To:
Frederick Howlett
Date:
[26 January 1864]
Source of text:
RS:HS 24.26
Summary:
On the observation of sun spots.
Contributor:
John Herschel Project
Showing 1–2 of 2 items
On the observation of sun spots.
More on the construction of a good optical eyepiece for solar observations [see FH's 1864-4-27].