From:
Mary Somerville
To:
John Murray III
Date:
3 Nov 1867
Source of text:
174, MS 41131, NLS
Summary:
No summary available.
Contributor:
Brigitte Stenhouse
No summary available.
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.
Writes to inquire as to the exact definition of the gallon and the pound, and the circumstances under which the appropriate measures would be made.