Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 337
watts per candle and theprobable life attainable with this efficiencyabout 250 hours. A number of experiments with pointo-lite lamps filled with gases other thannitrogen have resulted in the productionof lamps of much lower arc voltage thanthat previously obtainable. Thus theargon-filled 100… … Via, 4. Diagram of device to obviate blacken-ing. Arrows -how path of connection currents. A device ha- also been developed forincreasing the life of pointolite lampsby eliminating blackening of the bulb.This device involves the use of a glassiap near the pip, forming a dome abovethe arc and…
Lighting
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