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).
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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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No
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