| William Francis, Henry Croft - 1856 - 500 sider
...aluminium be not too great. A twentieth part of aluminium gives copper the brilliancy and fme colour of gold, and at the same time sufficient hardness to...scratch the alloy of gold employed in coin, without any injury to its malleability. A tenth part of aluminium with copper produces an alloy of .a pale... | |
| 1856 - 504 sider
...aluminium be not too great. A twentieth part of aluminium gives copper the brilliancy and fine colour of gold, and at the same time sufficient hardness to...scratch the alloy of gold employed in coin, without any injury to its malleability. A tenth part of aluminium with copper produces an alloy of a pale gold... | |
| 1857 - 604 sider
...polished. This operation has for its object to dissolve out the metals which darken the color of aluminium by their presence. Aluminium forms alloys with nearly...scratch the alloy of gold employed in coin, without impairing in the slightest degree its malleability. By an increase of the per centage of copper in... | |
| 1857 - 594 sider
...aluminium be not too great. A twentieth part of aluminium gives to copper the brilliancy and fine colour of gold, and at the same time sufficient hardness to scratch the alloy of gold employed in the currency, and this without injury to its malleability. A tenth part of aluminium with copper produces... | |
| Academy of Natural Sciences of Philadelphia - 1858 - 280 sider
...are the most interesting. Five parts of aluminium with one hundred parts of pure silver produce ¡m alloy almost as hard as a silver coin, which contains...degree its malleability. By an increase of the per ccntago of copper in alloys of aluminium the alloy i? rendered brittle, showing that the metal must... | |
| 1857 - 604 sider
...alloy of a pale gold color, possessing great hardness and considerable malleability ; its hardnqps is greater than that of bronze, in the proportion...explains the peculiar properties ascribed to it by M. Regnanlt in his investigation on the physical properties of the aluminium prepared by M. Deville, exhibited... | |
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