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FL-0685

From:
Darwin, Emma
To:
Darwin, H. E.
Date:
[24 September 1866]
Source of text:
DAR 219.9: 46
Summary:

No summary available.

Contributor:
Darwin Family Letters

Herschel4914

From:
George Biddell Airy
To:
Sir John Herschel
Date:
[24 September 1866]
Source of text:
RS:HS 1.302 (C: RGO 6.149.7)
Summary:

Wants JH's opinion on the question of maintaining observatories at Bombay and Madras.

Contributor:
John Herschel Project

Herschel6683

From:
John Henry Dallmeyer
To:
Sir John Herschel
Date:
[24 September 1866]
Source of text:
RS:HS 6.2
Summary:

Outlining phenomena in the refraction of light. Has been experimenting with wide angle lenses for cameras and gives some of their defects. Would like JH's opinion on how to get rid of the 'secondary focus.'

Contributor:
John Herschel Project
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