From:
Sir John Herschel
To:
Robert Ellis Dudgeon
Date:
[22 January 1871]
Source of text:
APS B.H435p.26 (C: RS:HS 24.348)
Summary:
Comments on use of 'air' lens rather than glass in some circumstances.
Contributor:
John Herschel Project
Showing 1–3 of 3 items
Comments on use of 'air' lens rather than glass in some circumstances.
Is grateful for his comments on his own paper on vision. Would he refer him to the work by Mr. Chopal on lens.
Relating his recent experiments in dioptrics. Encloses a model of his air-lens. Is grateful for the reference.