Method of using quadrant fitted with a plumb line and marked with shadow scales to measure the depth of well. From Robert Fludd 'Utriusque cosmi ... historia', Oppenheim, 1617-1619. Engraving.

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Method of using quadrant fitted with a plumb line and marked with shadow scales to measure the depth of well. From Robert Fludd 'Utriusque cosmi ... historia', Oppenheim, 1617-1619. Engraving.

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