Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 546
Stemming the bulbs of Wotan lamps … Making the spiders used in Wotan lamps. THE MANUFACTURE OF TANTALUM AND WOTAN LAMPS AT DALSTON. THE IUXMIXATIXf; ENGINEER trov. before ! >. - i r»_r pass* <1 every lamp is subjectto a photometric test. The photometeri^ sel to read the Btandard candle-powerand the corresponding voltage and…
Lighting
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