Edward N. Kent of the United States Assay Office at New York criticizes a gold refining process of a Professor McCulloh (likely Richard Sears McCulloh, 1818-1894).
James Curtis Booth (1810-1888) was Melter & Refiner at the United States Mint in Philadelphia. The James Booth papers are held by the Science History Institute in Philadelphia. Newman Numismatic Portal sponsored the digitization of the numismatic portions of this material in 2021.
Invention case file, containing correspondence related to the process of applying for and receiving a patent. Photocopies from the National Archives and Records Administration.
Invention case file, containing correspondence related to the process of applying for and receiving a patent. Photocopies from the National Archives and Records Administration.
