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Books Bücher 1 - 5 von 5 in ... yet the prejudice against innovation was so strong, that in Admiral Keppel's...
" ... yet the prejudice against innovation was so strong, that in Admiral Keppel's fleet, 1778, there was only one coppered ship." Copper-smelting. A prodigious quantity of copper is obtained from Lake Superior. Mr. Petherick, the well-known mining engineer,... "
Metallurgy: The Art of Extracting Metals from Their Ores, and Adapting Them ... - Seite 309
von John Percy - 1861 - 635 Seiten
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Knowledge for the time: a manual of reading, reference and conversation

1864
...copper is obtained from Lake Superior. Mr. Petherick, the well-known mining engineer, informed Dr. Percy that at Minnesota, in 18,54, not fewer than forty...single mass of native copper, weighing about 500 tons ! The native copper at Lake Superior in some places occurs curiously intermingled, but generally not...
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Knowledge for the Time: A Manual of Reading, Reference, and Conversation on ...

John Timbs - 1864 - 294 Seiten
...copper is obtained from Lake Superior. Mr. Petherick, the well-known mining engineer, informed Dr. Percy that at Minnesota, in 1854, not fewer than forty men...single mass of native copper, weighing about 500 tons ! The native copper at Lake Superior in some places occurs curiously intermingled, but generally not...
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Knowledge for the Time: A Manual of Reading, Reference, and Conversation on ...

John Timbs - 1864 - 294 Seiten
...Superior. Mr. Petherick, the well-known mining engineer, informed Dr. Percy that at Minnesota, in 1834, not fewer than forty men were engaged during twelve...single mass of native copper, weighing about 500 tons! The native copper at Lake Superior in some places occurs curiously intermingled, but generally not...
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Underground Life: Or, Mines and Miners

Louis Simonin - 1869 - 522 Seiten
...Petherick (the well-known mining engineer), that in 1854 not fewer than forty men were engaged at Minnesota during twelve months in cutting up a single mass of native copper weighing about 500 tons. (Percy's " Metallurgy," vol. ip 309.) The value of copper has since then fallen one quarter, and it...
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Chambers's information for the people, ed. by W. and R. Chambers, Band 1

William Chambers, Andrew Findlater - 1874
...Percy, in his large work on Metallurgy, states, on the authority of a wellknown fining engineer, ' that at Minnesota, in 1854, not fewer than forty men...single mass of native copper, weighing about 500 tons !' Copper ores are found in a great many countries, but it is only in some that they are smelted. Large...
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