From:
Sir John Herschel
To:
Francis Charles Knowles
Date:
[16 October 1856]
Source of text:
RS:HS 23.182
Summary:
Thinks that aluminum coating on telescope mirrors may work [see FK's 1856-10-9]; also suggests looking into flouric glass containing aluminum for lenses of low dispersion power.
Contributor:
John Herschel Project