Abstract
A PAPER read by J. N. Aldington on November 14 last before the Illuminating Engineering Society gave a general survey of tungsten filament projector lamps, showing the trend of recent developments in this field. The paper embraces consideration of the characteristics of tungsten filaments in vacuo and in gaslamps employing both single-wound and double-wound helices, multi-filament lamps, and symmetrical light sources. Various types of lamps are illustrated photographically, and lamp performance data are given in tabular form.
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Bright Light Sources. Nature 155, 265 (1945). https://doi.org/10.1038/155265b0
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DOI: https://doi.org/10.1038/155265b0