From:
Sir John Herschel
To:
the R.A.S.
Date:
[8 August 1864]
Source of text:
R.A.S.M.N., 24 (1864), 220-1
Summary:
Describes a revolving eyepiece that could protect the eye from excess light in solar observation.
Contributor:
John Herschel Project
Describes a revolving eyepiece that could protect the eye from excess light in solar observation.