Surveyors using quadrants to measure the height of a tower, c1617-c1619. Artist: Robert Fludd
Caption:
Surveyors using quadrants to measure the height of a tower, 1617-c1619. Quadrants fitted with plumb bobs and marked with shadow scales to measure the height of a tower. From Robert Fludd Utriusque cosmi?..historia. Oppenheim, 1617-19.