Observers using a refracting telescope of long focal length mounted on a tripod, and fitted with a simple plumb line and scale for measuring the altitude of the object being observed. Engraving from 'Oculus artificialis teledioptricus sive Telescopium' by Johann Zahn (Nuremberg, 1702).
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Image Number: 1746-19625283Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:3160×2415
