Search: Herschel, John in correspondent 
Main, Robert in correspondent 
1860-1869::1868 in date 
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Herschel12138

From:
Sir John Herschel
To:
Robert Main
Date:
[19 September 1868]
Source of text:
RS:HS 24.227
Summary:

Thanks RM for the double star observations he has sent.

Contributor:
John Herschel Project

Herschel11918

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

Herschel12139

From:
Sir John Herschel
To:
Robert Main
Date:
[29 September 1868]
Source of text:
RS:HS 24.229
Summary:

Sends RM a copy of Angelo Secchi's double star observations pointing to a very large number of calculation errors.

Contributor:
John Herschel Project

Herschel11919

From:
Robert Main
To:
Sir John Herschel
Date:
[30 September 1868]
Source of text:
RS:HS 12.281
Summary:

About the location of several different sets of double star observations.

Contributor:
John Herschel Project

Herschel11920

From:
Robert Main
To:
Sir John Herschel
Date:
[1 October 1868]
Source of text:
RS:HS 12.282
Summary:

Comments on the quality of some of the double star observations in print.

Contributor:
John Herschel Project

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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