Abstract
Glass for electric lamps must have many different properties, e.g. transparency, resistance to heat, ability to form hermetic seals with the current leads, resistance to chemical attack and weathering, and different types of lamps require glasses differing in composition. Appropriate methods of glass melting are described in this paper, and the necessary properties of glass for tungsten lamp bulbs, fluorescent tubes, pinches and for sealed beam headlamps are discussed; appropriate compositions and forming methods are also given. Production methods for glass and quartz tubes for high pressure discharge lamps are outlined and the particular problems of sodium lamps—glass blackening and argon absorption—are discussed in detail.
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