From:
Joseph Burnley Hume
To:
Sir John Herschel
Date:
[25 April 1853]
Source of text:
TxU:H/M-0284; Reel 1087
Summary:
Describes new machinery at U.S. mint in Philadelphia. Refers JH to G. F. Dunning (visiting England) and Franklin Peale (chief coiner) for more information. U.S. mint uses humid assay of silver. Facts about gold assays.
Contributor:
John Herschel Project