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Airy, George Biddell in correspondent 
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1840-1849::1844::06 in date 
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From:
Sir John Herschel
To:
George Biddell Airy
Date:
[18 June 1844]
Source of text:
RS:HS 1.137 & 22.199
Summary:

Regarding object glasses for telescopes. Relative merits of Munich and French object glasses.

Contributor:
John Herschel Project
From:
George Biddell Airy
To:
Sir John Herschel
Date:
[29 June 1844]
Source of text:
RS:HS 1.138
Summary:

Further observations on object glasses.

Contributor:
John Herschel Project