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Long-range signal light for roadway - has intense pinpoint source with luminescent device opposite aperture
Long-range signal light for roadway - has intense pinpoint source with luminescent device opposite aperture
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机译:用于道路的远程信号灯-具有精确的光源,对面的发光装置
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摘要
The light is mounted in an opaque housing with one or more apertures, and has an intense and virtually pinpoint source, placed in the centre of a focussing device, and a luminescent device capable of rendering an appreciable area luminous. The latter two devices are opposite the aperture. The luminescent device can be a discharge tube of ring or spiral shape. The light is partic. for signally use on motorways etc., and produces no blind spots, the combination of the two sources giving a substantially constant illumination.
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