Search: Herschel, John in correspondent 
Main, Robert in correspondent 
1860-1869::1868::11 in date 
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Herschel12140

From:
Sir John Herschel
To:
Robert Main
Date:
[24 November 1868]
Source of text:
RS:HS 24.240
Summary:

Seems to JH to be some systematic error in some of RM's observations; JH includes examples.

Contributor:
John Herschel Project

Herschel7761

From:
Robert Main
To:
Sir John Herschel
Date:
[28 November 1868]
Source of text:
RAS:JH Archive 14/3.17; Reel 11
Summary:

Notes strengths and weakness of heliometer for observing double stars. Calls it 'laborious, troublesome instrument.'

Contributor:
John Herschel Project
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