April 10, 1858
1 min read
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Alloy for Medals, Small Figures, &c Herr von Bibra states that an alloy consisting of 6 parts bismuth, 3 tin, and 13 lead, is very fusible, and remarkably hard, without being brittle The fracture does not present any crystalline appearance When objects cast with this alloy are moistened with dilute nitric acid, and rubbed with a woolen rag, the raised portions appear bright, and the depressions dull Some castings of medals from gypsum molds were so perfectly reproduced that writing, which could be read on the originals only by aid of the microscope, was I quite distinct in the copies It is probable ; that this alloy would be serviceable for typo1 graphic purposesAmerican Mining Chronicle
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