Observers using a refracting telescope

Observers using a refracting telescope

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Credit: Universal History Archive/UIG/SCIENCE PHOTO LIBRARY

Caption: 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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