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Henderson, Ebenezer in correspondent 
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From:
Ebenezer Henderson
To:
Sir John Herschel
Date:
[12 November 1849]
Source of text:
RS:HS 9.279
Summary:

Is having an astronomical clock constructed and would like his advice on the calculation of some of the movements. Gives a brief description of the clock.

Contributor:
John Herschel Project
From:
Ebenezer Henderson
To:
Sir John Herschel
Date:
[21 November 1849]
Source of text:
RS:HS 9.280
Summary:

Thanks for his letter but it does not allude to the calculation he sent. Has seen astronomical clocks previously.

Contributor:
John Herschel Project
From:
Ebenezer Henderson
To:
Sir John Herschel
Date:
[9 May 1850]
Source of text:
RS:HS 9.281
Summary:

Sends his fractional approximation of a sidereal revolution. Would like his opinion on its accuracy. Clock will not be finished for several years.

Contributor:
John Herschel Project
From:
Ebenezer Henderson
To:
Sir John Herschel
Date:
[20 May 1850]
Source of text:
Harvard: Houghton AAH 67m-67 (51)
Summary:

Requests JH's opinion on his calculation on 'solar and sidereal ratios.'

Contributor:
John Herschel Project
Collection
Document type
Transcription available