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 (titre original)

inconnu, “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 (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 19 décembre 2024, https://bibnum.obspm.fr/ark:/11287/3GdPK.