From:
Sir John Herschel
To:
John Henry Dallmeyer
Date:
[19 February 1867]
Source of text:
RS:HS 6.6 & 24.189
Summary:
Outlining suitability of various types of glass for optical work. Gives details of theories of his reading lenses and calls attention to one of his own papers in the R.S.P.T. for 1821.
Contributor:
John Herschel Project