rely chemical, he utilizes the property which calcium possesses of dis- Hardening Articles of IMaster of Paris. solving in liquid sodium at a dull red heat. In an A German patent has been granted for the treatment iron crucible of one liter capacity are placed 600 of articles of plaster of Paris… … jects are subsequently rinsed off and dried. The sur- may be broken by striking it, and the fracture presents face becomes very hard after two days and insoluble a crystalline structure. Its surface, when it has not motive with enormous drive wheels, especially adapted in water, while the…
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