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0460000603

Surveying: Top; measuring angles using a quadrant. Bottom; obtaining levels and altitudes using Hulsius's planimeter. From Levinus Hulsius 'Instrumentorum Mechanicorum', Frankfort-am-Main, 1605. Engraving

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Surveying: Top; measuring angles using a quadrant. Bottom; obtaining levels and altitudes using Hulsius's planimeter. From Levinus Hulsius 'Instrumentorum Mechanicorum', Frankfort-am-Main, 1605. Engraving