From:
Robert Main
To:
Sir John Herschel
Date:
[21 September 1868]
Source of text:
RS:HS 12.280
Summary:
Comments on double star observations and some papers on the subject.
Contributor:
John Herschel Project
Showing 1–4 of 4 items
Comments on double star observations and some papers on the subject.
About the location of several different sets of double star observations.
Comments on the quality of some of the double star observations in print.
Notes strengths and weakness of heliometer for observing double stars. Calls it 'laborious, troublesome instrument.'