Observatoire du Cap. Siderical clock in the photographic observations, giving electric contacts for control of the driving clock (titre original)

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inconnu, “Observatoire du Cap. Siderical clock in the photographic observations, giving electric contacts for control of the driving clock (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 24 novembre 2024, https://bibnum.obspm.fr/ark:/11287/1xtSq.