U.S. Naval Observatory, Washington. Auxiliary apparatus, consisting of motor-generator with adjustable speed control and phase shifter, which supplies current for the synchronous motor

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“U.S. Naval Observatory, Washington. Auxiliary apparatus, consisting of motor-generator with adjustable speed control and phase shifter, which supplies current for the synchronous motor,” Bibliothèque numérique - Observatoire de Paris, consulté le 21 janvier 2019, https://bibnum.obspm.fr/ark:/11287/24Xpg.