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Expired
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GB2258919A
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Individual
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Individual
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Priority to GB2258919ApriorityCriticalpatent/GB153421A/en
Publication of GB153421ApublicationCriticalpatent/GB153421A/en
H01K1/62—One or more circuit elements structurally associated with the lamp
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Non-Portable Lighting Devices Or Systems Thereof
(AREA)
Abstract
153,421. Calvert, G. Sept. 13, 1919. Filaments; caps.-In a metal-filament vacuum lamp, a magnetic fiux is produced in the neighbourhood of the filament to prevent scattering. The flux may be produced by one or more permanent magnets or by a coil in series or parallel with the filament. In the lamp shown, a coil 5 is connected to one end of the filament and to one of the lamp contacts through a hole 9 in the cap. The flux produced is parallel to the filament; no flux is necessary at the bends, the filament being cooled there by the supports. There is preferably no iron in the magnetic circuit; when alternating current is used the current in the coil should be in phase with that in the filament,
GB2258919A1919-09-131919-09-13Improvements in and connected with electric incandescent lamps
ExpiredGB153421A
(en)
Improvements in lighting fittings adapted to take a high pressure metal-vapour electric discharge lamp and comprising means for establishing a magnetic field in its neighbourhood