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1850-1859::1855::11 in date 
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From:
Achille Brachet
To:
Sir John Herschel
Date:
[8 November 1855]
Source of text:
RS:HS 4.210
Summary:

Concerning telescopes and their fittings, and queries relative to them. Intends to publish a work on them.

Contributor:
John Herschel Project
From:
Achille Brachet
To:
Sir John Herschel
Date:
1855-11
Source of text:
RS:HS 4.211
Summary:

On telescopes and their fittings.

Contributor:
John Herschel Project