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R.A.S., the in correspondent 
1860-1869::1864 in date 
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Herschel7782

From:
Sir John Herschel
To:
the R.A.S.
Date:
[29 June 1864]
Source of text:
RAS: MSS Add.29 [suppl.]
Summary:

Learned that R.A.S. plans to use aplanatic lenses for solar studies. Submits set of unpublished tables by W. L. Newman [see Newman's 1845-2-18] for calculating radii of such lenses. Refers to work of this kind by Josef Fraunhofer, [G. P.] Bond, K. A. Steinheil, and C. F. Gauss.

Contributor:
John Herschel Project

Herschel8946

From:
Sir John Herschel
To:
the R.A.S.
Date:
[8 August 1864]
Source of text:
R.A.S.M.N., 24 (1864), 220-1
Summary:

Describes a revolving eyepiece that could protect the eye from excess light in solar observation.

Contributor:
John Herschel Project
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