To etch names, figures, etc., on steel
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Article
📅
1912
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Elsevier Science
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English
⚖ 64 KB
due to the gradual production of a gray deposit on the inside of the tube, which is possibly mercury silicate. Or it may be due to a change in the gaseous composition in the tube. Observation suggests that it is mainly due to the high temperature, and that it might be beneficial to cool the lamps wh