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SLAG(S): noun. A collectors’ term for a glass marble; but the original name used by the companies that manufactured these types of marbles, and always seen in the historic record, is Onyx. These marbles are almost always hand-gathered and can be either hand-made or machine-made. This was the first type of glass marble made for commercial purposes, in the 1850s, by Elias Greiner, in Lausha Germany; these were hand-made and can be easily identified by its ground pointil. Another hand-made version was the first glass marble made in the USA, in the late 1880s, by James Harvey Leighton and can be identified by its melted pontil. Slags, or Onyx marbles were among the first machine-made marbles, manufactured by The M.F. Christensen & Son Company in 1903, in the 1910s by The Akro Agate Company and the 1920s by The Christensen Agate Company, the Peltier Glass Company and in Lauscha, Germany. In the late 1929s a gob-feed, or totally automated, version of this common type of glass marble was produced by The Christensen Agate Company and the Peltier Glass Company, under license of a patent belonging to The Hartford Empire Company. A few examples can also be found that were made from glass canes and are easily identified by having two cut-off marks, one at each pole. The term “slag” is a toxic, industrial waste, as defined by the US Patent and Trademark Office

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