Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 268
Fig. 1.— LightingType. Types of Discharge Lamps. Fig. 2.— LetterType. … Fig. 3.-—-Showing arrangements of DischargeLamps to form letter sign. degree of exhaustion was reached thenegative glow filled the greater part ofthe tube. The Discharge Lamp depended forits luminosity on this negative glow, thepressure being so adjusted that the glowappeared as a layer of luminous…
Lighting
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