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Report Made to the Hon. Thomas Corwin, Secretary of the Treasury: By ...
Richard Sears McCulloh
No preview available - 2019
accident adjusted accounts aforesaid letter alloy amount apparatus apparent wastage April 1 Bar assay office assay slips assayer borax cellar cents per ounce charge crucible cupelling DEAR SIR deposite meltings dirt duties ECKFELDT employed expense facts February fineness fluxes Franklin Peale G. N. ECKERT gold bullion gold refined gold wastage gold with zinc grains granulating furnace ingots large quantities late director March March 12 Martin Summers materials and labor melter and refiner melting department ment metal method of refining mode of granulating Monell nitric acid obedient servant ounce per thousand ounces of gold Patterson PHILADELPHIA present proceedings process for refining Prof Professor Booth R. S. McCULLOH ratio refining department refining gold refining operations refining with zinc request respectfully Secretary silver wastage standard ounces sulphuric acid sweeps thereof THOMAS CORWIN thousandth tion toughened Treasury trial valve volatilization workmen YEARSLEY