Didymium Goggles
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T.K.C.
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Article
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1932
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Elsevier Science
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English
โ 52 KB
Didymium Goggles.--( Ceramic Industry, Feb. I932.) Didymium, a chemical element, classed among the rare earth metals, can, in the form of its oxide, be used as a constituent of glass. Its presence in the glass, gives the latter the particular ability of filtering out the yellow light rays at the tim