The British Encyclopedia: Or, Dictionary of Arts and Sciences. Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge, Volum 10Mitchell, Ames, and White, 1818 |
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... metal , which in most of its properties is equal to gold , but in others it is very superior . It was first ascertained to be a distinct me- tal by Scheffer , a Swedish chemist , in the year 1752. By him it was named white gold ...
... metal , which in most of its properties is equal to gold , but in others it is very superior . It was first ascertained to be a distinct me- tal by Scheffer , a Swedish chemist , in the year 1752. By him it was named white gold ...
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... metal , and then cast into moulds , at first in the form of square plates . It is then exposed to a red heat , and hammered into bars . By the heating and hammering , the arsenic is driven off , and the metal is purified and becomes ...
... metal , and then cast into moulds , at first in the form of square plates . It is then exposed to a red heat , and hammered into bars . By the heating and hammering , the arsenic is driven off , and the metal is purified and becomes ...
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... metal not fusible even at very intense heats , is employed as the mea- sure of expansion . A rod or plate of this metal is placed horizontally in a groove framed in a mass of hardened white clay ; one extremity of the rod is supported ...
... metal not fusible even at very intense heats , is employed as the mea- sure of expansion . A rod or plate of this metal is placed horizontally in a groove framed in a mass of hardened white clay ; one extremity of the rod is supported ...
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