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SPIRAL GLOBE Ltd
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SPIRAL GLOBE Ltd
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Publication of GB189813037ApublicationCriticalpatent/GB189813037A/en
Vessels And Coating Films For Discharge Lamps
(AREA)
Abstract
13,037. S p i r a l Globe (Limited) and Parker, B. C. E. June 10. Shaping. - Electric incandescent lamp bulbs are provided with internal lightrefracting coils d of glass rod. This is effected by winding the glass rod on a former, and placing the coil within a cylinder c, which is then contracted on the coil, to form a bulb. The contraction may be performed by closing the cylinder and exhausting air from it through a tube. In another method, a bulb is blown of the desired size, cut in two, placed over the coil. and re-united by welding a thin strip of glass on its edges.
GB189813037D1898-06-101898-06-10Improvements in Electric Glow Lamps.
ExpiredGB189813037A
(en)