Application of the thermopile to photome
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Article
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1911
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Elsevier Science
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English
β 65 KB
in an electrolytic bath to reconvert it to metallic tungsten. This renders it more or less porous. To make it compact it is subjected to a white heat under an oxy-hyd.rogen blowpipe while being simultaneously worked by hammering and rolling. The heat must not be high enough to cause oxidation. The i