Plumb line posters & prints

Engraving of Andrea Palladio Bernard Picart

Safety Valve Anonymous

Archaeologist Bernardino Drovetti measuring a colossal head in the Egyptian desert G Engelmann

Surveying, early 17th century Unknown

‘Travelled stone’ M S Baird

Surveying, early 17th century Unknown

The Three Fates, c.1670 Sebastiano Mazzoni

Using a quadrant with a plumb bob to calculate the height of a tower by triangulation, 1551 Unknown

Portrait of Andrea Palladio in half-length within an oval frame; a compass, carpenter's sq…, 1716 Bernard Picart

Stars of Cassiopeia, Draco, Ursa Major and Ursa Minor in relation to Polaris Thomas Wright