Isbn: 9780656851287 - 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) (3 risultati)

PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Condizione: New. Print on Demand. This book presents the findings of the author's 1851 trial of a new method of refining gold using zinc. The author's method was compared with the silver process commonly used at the time. Conducted in the Philadelphia mint, the trial was overseen by the institution's director with the approval of the treasury department. The author's method of refining was found to be economical in terms of materials and labor, requiring less labor and fewer costly materials than the silver refining method. The author's method was also found to produce a refined gold of excellent quality, producing well-formed ingots and coins. The author argues that their method would save the nation money and waste in the refining process and would enhance the nation's wealth and industry. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.…