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Surveying, from Levinus Hulsius Instrumentorum Mechanicorum, Frankfurt-am-Main, 1605. Artist: Levinus HulsiusSurveying, from Levinus Hulsius Instrumentorum Mechanicorum, Frankfurt-am-Main, 1605. Top; measuring angles using a quadrant. Bottom; obtaining levels and altitudes using Hulsiuss planimeter
Arabic 18th century planispheric astrolabe, 18th centuryArabic 18th century planispheric or flat astrolabe, 18th century