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1840-1849::1846::09 in date 
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From:
Sir John Herschel
To:
Richard Roberts
Date:
[26 September 1846]
Source of text:
RS:HS 25.6.34 & 25.7.1
Summary:

Talks about considerations to be taken into account when building telescope specula, especially large ones.

Contributor:
John Herschel Project
Document type
Transcription available