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010554

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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010554.jpg
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Irish Photo Archive
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3160x2415 / 1.6MB
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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).