File:William Sturgeons first induction coil.png
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Summary
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English: Drawing of one of the first induction coils, built by British physicist William Sturgeon in 1837. The primary of the coil (B) was 260 ft. of bell wire wound on a wooden bobbin with an iron core, and the secondary was 1300 ft of thinner wire, insulated with a wax coating, wound on top, and soldered to the primary wire to make an autotransformer. The primary was powered by a liquid battery cell (0). The zinc sawtooth interrupter wheel (D) dipping in mercury was turned by hand to break the primary current, to create the flux changes necessary to induce a voltage in the secondary. The magnitude of the voltage produced was judged by how strong a shock it gave when the copper handles (H) were held. It was one of the first transformers to use a divided iron core to prevent eddy currents. Sturgeon experimented with several cores and found that a core made of separate iron wires (F) gave more powerful shocks than a solid iron core when the interrupter wheel got above a certain speed (although Prof. G. H. Bachhoffner had discovered this a few weeks before Sturgeon, using one of Sturgeon's own coils.) Demonstrated to the London Electrical Society in August, 1837 |
| Date | |
| Source | Downloaded 2012-05-20 from John Ambrose Fleming (1893) The Alternate Current Transformer in Thory and Practice, Vol.2, The Electrician Printing and Publishing Co., London, p.11,fig.6 on Google Books |
| Author | John Ambrose Fleming |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:50, 20 May 2012 | | 550 × 462 (33 KB) | Chetvorno |
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