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Herschel, John in addressee 
John Herschel Project in contributor 
Airy, George Biddell in author 
1840-1849::1848::05 in date 
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From:
George Biddell Airy
To:
Sir John Herschel
Date:
[4 May 1848]
Source of text:
RS:HS 1.200 (C: RGO 6.160.29)
Summary:

Regarding the reinstatement of the zenith tube.

Contributor:
John Herschel Project
From:
George Biddell Airy
To:
Sir John Herschel
Date:
[6 May 1848]
Source of text:
RS:HS 1.201 (C: RGO 6.160.30)
Summary:

Further information on the zenith tube. Description of a zenith tube.

Contributor:
John Herschel Project