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Date est exactement "1933 ?"

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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 (titre original)

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)

Mots-clés: Astronomie -- Instruments| Etats-Unis| Observatoires| United States naval observatory

U.S. Naval Observatory, Washington. Armature and field magnets of two-phase synchronous motor which drives micrometer (titre original)

U.S. Naval Observatory, Washington. Armature and field magnets of two-phase synchronous motor which drives micrometer (titre original)

Mots-clés: Astronomie -- Instruments| Etats-Unis| Observatoires| United States naval observatory

U.S. Naval Observatory, Washington. Motor-driven impersonal micrometer of 6-inch [15 cm.] transit circle (titre original)

U.S. Naval Observatory, Washington. Motor-driven impersonal micrometer of 6-inch [15 cm.] transit circle (titre original)

Mots-clés: Astronomie -- Instruments| Etats-Unis| Observatoires| United States naval observatory

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