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![Diagram of the singing arc's circuit, from Duddell [10, 11]. | Download](https://i2.wp.com/www.researchgate.net/profile/Jean-Marc-Ginoux/publication/327096171/figure/fig1/AS:661710654427138@1534775522859/Diagram-of-the-singing-arcs-circuit-from-Duddell-10-11.png)
