William Duddell's Singing Arc

The Singing Arc consisted of the predecessor to the filament lightbulb--the Carbon Arc Lamp which generated light by creating a spark between two carbon nodes. Well, the Carbon Arc lamp was placed on streets throughout Europe, but it made a constant hum. So, it was later replaced by Edison's patented lamps. Before this though, William Duddell was hired to solve the issue of the pesky humming. I still don't know if he ever solved the problem, but he came up with a wonderful sounding solution. He hooked up a keyboard to several of these lamps which he tuned to different frequencies by modulating the voltage. http://profiles.incredible-people.com/william-du-bois-duddell/

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