From:
Sir John Herschel
To:
John Tyndall
Date:
[3 November 1867]
Source of text:
RS:HS 24.210
Summary:
Believes Michael Faraday's boro-silicate of lead has not been used for telescopes, but JH and others have tried using it for other optical purposes. Describes method for producing veinless flint glass.
Contributor:
John Herschel Project