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current | 01:24, 15 January 2008 | 990 × 1,812 (44 KB) | Phrood~commonswiki | added margin | |
07:47, 10 May 2006 | 790 × 1,612 (47 KB) | Phrood~commonswiki | == Summary == Self-regulating arc lamp proposed by William Edwards Staite and William Petrie in 1847. Source: G. Woodward: ''Staite and Petrie: pioneers of electric lighting'', ''IEEE Proceedings of Science, Measurement and Technology'', 136-6/Nov. |
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