From:
Sir John Herschel
To:
Francis Baily
Date:
[13 May 1831]
Source of text:
RS:HS 25.2.6
Summary:
Suggests an improvement in measuring techniques for astronomical observations, by making the angular measurement by direct and then reflected vision. JH wonders whether this idea might be appended to a paper currently under consideration by the R.A.S.
Contributor:
John Herschel Project