Report Made to the Hon. Thomas Corwin, Secretary of the Treasury, Professor R. S. McCulloh, of His Operations at the Mint of the United States, in ... Gold by His Zinc Method (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Report Made to the Hon. Thomas Corwin, Secretary of the Treasury, Professor R. S. McCulloh, of His Operations at the Mint of the United States, in Refining California Gold by His Zinc Method

I have set forth these facts, because it should be understood, that my preliminary trials were made without reference to the questions of comparative time or economy of labor and materials.

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