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SourcesColson R., Traité Élémentaire d'electricité, Gauthier-Villars, Paris, 1885, pag. 106, fig. 51.
Joubert J., Traité Élémentaire d'electricité, G. Masson Éditeur, Paris, 1889, pag. 283, fig. 230.
The indications that complete the voice "Working" have the following meaning: P = partial; R = repaired; * = used for the didactics; X = verification impossible.