their English translation of the 1556

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he worked in China and used it during his tenure at the White House when they wanted to foil eavesdroppers.[9] The Boxer Rebellion trapped the Hoovers in Tianjin in June 1900. For almost a month, the settlement was under heavy fire. Hoover himself guided US Marines around Tianjin during the battle, using his extensive knowledge of the local terrain.[10]
Hoover was made a partner in Bewick, Moreing & Co. in 1901 and assumed responsibility for various Australian operations. In August–September 1905, Hoover came up with a technological innovation. When visiting the mines at Broken Hill, New South Wales, he noticed considerable zinc in the Broken Hill lead-silver ore, which could not be recovered and was lost as tailings. Hoover devised a practical and profitable method to use the then-new froth flotation process to treat these tailings and recover the zinc.[11] With William Baillieu and others, he founded the Zinc Corporation (later, following various mergers, a part of Rio Tinto Group).
In 1908, he became an independent mining consultant, traveling worldwide until the outbreak of World War I in 1914. His lectures at Columbia and Stanford universities were published in 1909 as Principles of Mining,[12] which became a standard textbook. Hoover and his wife also published their English translation of the 1556 mining clas

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