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Diagram of a Nocturnal, an instrument used to determine time at night by the stars
ARP23A13_305

Diagram of a Nocturnal, an instrument used to dete...

Engraving of a Coelostat by Léon Foucault
ARP23A13_315

Engraving of a Coelostat by Léon Foucault

Photograph of a Coelostat being used at the Cambridge University observatories
ARP23A13_312

Photograph of a Coelostat being used at the Cambri...

Photograph of a Coelostat being used at the Cambridge University observatories
ARP23A13_313

Photograph of a Coelostat being used at the Cambri...