Search: Herschel, John in correspondent 
Roberts, Richard in correspondent 
letter in document-type 
John Herschel Project in contributor 
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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
From:
Richard Roberts
To:
Sir John Herschel
Date:
[5 October 1846]
Source of text:
RS:HS 14.496
Summary:

Thanks JH for suggestions concerning optics. Will soon build a model telescope. Asks a series of questions concerning the construction of telescopes.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Richard Roberts
Date:
[18 October 1846]
Source of text:
RS:HS 25.7.2
Summary:

Questions related to JH's 1846-9-26 having been asked by RR, JH writes to answer these questions.

Contributor:
John Herschel Project