From:
Sir John Herschel
To:
Frederick Howlett
Date:
[7 April 1871]
Source of text:
RS:HS 24.361
Summary:
Is at present too ill to involve himself in any calculations necessary for making a good optical eyepiece.
Contributor:
John Herschel Project
Is at present too ill to involve himself in any calculations necessary for making a good optical eyepiece.