Glasses for protecting the eyes from inj
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W.W. Coblentz; W.B. Emerson
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Article
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1917
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Elsevier Science
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English
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THE object of the present paper is to give the general characteristics of certain newly-developed glasses sometimes used for protecting the eye from radiant energy, especially the infra-red or so-called heat rays. Because of the difficulty in reproducing the same color in different melts, no attempt