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British Thomson Houston Co Ltd
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British Thomson Houston Co Ltd
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Application filed by British Thomson Houston Co LtdfiledCriticalBritish Thomson Houston Co Ltd
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Publication of GB191501088ApublicationCriticalpatent/GB191501088A/en
H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
H01J9/38—Exhausting, degassing, filling, or cleaning vessels
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Engineering & Computer Science
(AREA)
Manufacturing & Machinery
(AREA)
Vessels And Coating Films For Discharge Lamps
(AREA)
Abstract
1088. British Thomson-Houston Co., [General Electric Co.]. Jan. 22. High vacua in lamp bulbs, obtaining. - During the evacuation of lamp bulbs &c. composed of glass of relatively high melting-point, they are heated first to a temperature near the point of deformation, and afterwards to a considerably lower temperature. With a sodium magnesium boro-silicate glass known as low expansion glass, the first temperature is from 550 to 600‹ C., and the second from 400 to 500‹C.
GB191501088D1915-01-221915-01-22Improvements in and relating to Methods of Exhausting Incandescent Lamps or similar Glass Receptacles.
ExpiredGB191501088A
(en)