Report made to the hon. Thomas Corwin, secretary of the Treasury, by professor R.S. McCulloh, of his operations at the mint of the United States, in refining California gold by his zinc method |
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1st Auditor accident adjusted accounts aforesaid letter amount apparatus apparent wastage April 1 Bar assay slips assayer borax cellar cents per ounce charge Copper alloy crucible cupelling DEAR SIR deposite meltings depositors dirt employed expense facts February February 17 fineness fluxes Franklin Peale G. N. ECKERT gold bullion GOLD DEPOSITED gold refined gold wastage gold with zinc grains granulating furnace late director loss Martin Summers melter and refiner melting department ment metal method of refining mode of granulating Monell nitric acid November 13 obedient servant ounce per thousand ounces of gold PHILADELPHIA present proceedings process for refining Prof Professor Booth R. S. McCULLOH refining department refining gold refining with zinc Report of 1st request respectfully Secretary silver alloy silver wastage standard ounces sulphuric acid sweeps thereof THOMAS CORWIN thousandth tion toughened Treasury trial United States mint valve volatilization workmen YEARSLEY