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1830-1839::1839::02 in date 
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From:
George Biddell Airy
To:
Sir John Herschel
Date:
[3 February 1839]
Source of text:
RS:HS 1.76
Summary:

Further observations on the alterations at Cape Town Observatory. Any news of the measuring bars?

Contributor:
John Herschel Project
From:
George Biddell Airy
To:
Sir John Herschel
Date:
[25 February 1839]
Source of text:
RS:HS 1.77 (C: RGO 6.368.619)
Summary:

Thomas Maclear's assistant and equipment arranged. Observations on copper horse-shoe bars applied to the end of his magnet.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
George Biddell Airy
Date:
[27 February 1839]
Source of text:
RGO 6.368.620
Summary:

Thanks GA for all his efforts on Thomas Maclear's behalf [see GA's 1839-2-25]; comments on some developments in photography, including the work of Nicephore Niepce done in approximately 1826.

Contributor:
John Herschel Project