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| | Edison, Thomas [encyclopedia] |
 | | Jumbo dynamos, with drum-wound armatures, could maintain 110 volts with 90 percent efficiency. |
| | The three-wire system, first installed in Sunbury, Pennsylvania, in 1883, superseded the parallel circuit, used 110 volts, and necessitated high-resistance lamp filaments (metal alloys were later used). |
| | In 1883 Edison made a significant discovery in pure science, the Edison effect.electrons flowed from incandescent filaments. |
| www.artzia.com /History/Biography/Edison (1411 words) |
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