From:
Thomas Graham
To:
Sir John Herschel
Date:
[19 August 1869]
Source of text:
RS:HS 8.231
Summary:
His letter has been forwarded. JH's correspondence with the Mint to which J. G. Hubbard refers has been published in the Report of the Commissioners on International Coinage 1868. Thinks expansion of mercurial amalgam is due to hydrogen. Hopes JH will accept a small medallion.
Contributor:
John Herschel Project