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1870-1879 in date 
Dudgeon, Robert Ellis in author 
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From:
Robert Ellis Dudgeon
To:
Sir John Herschel
Date:
[23 January 1871]
Source of text:
RS:HS 6.507
Summary:

Is grateful for his comments on his own paper on vision. Would he refer him to the work by Mr. Chopal on lens.

Contributor:
John Herschel Project
From:
Robert Ellis Dudgeon
To:
Sir John Herschel
Date:
[23 February 1871]
Source of text:
RS:HS 6.508
Summary:

Relating his recent experiments in dioptrics. Encloses a model of his air-lens. Is grateful for the reference.

Contributor:
John Herschel Project