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'The Regent Street Quadrant at Night', c1897.  Artist: Francis LM Forster
 
Using a quadrant with a plumb bob to calculate the height of a tower by triangulation, 1551. Artist: Unknown
 
Surveying, from Levinus Hulsius Instrumentorum Mechanicorum, Frankfurt-am-Main, 1605. Artist: Levinus Hulsius
 
Surveyors using quadrants to measure the height of a tower, c1617-c1619. Artist: Robert Fludd
 
Using astrolabes to calculate the height of a steeple, 1539. Artist: Petrus Apianus
 
Forms of astrolabe in use for surveying, 1650. Artist: Unknown
 
Johannes Hevelius, German astronomer, 1647. Artist: Unknown
 
Surveying, 1551. Artist: Unknown
 
Surveying and timekeeping, 1551. Artist: Unknown
 
Surveying, early 17th century. Artist: Unknown
 
Surveying, early 17th century. Artist: Unknown
 
Title page of The Description and Use of the Sector by Edmund Gunter, 1636. Artist: Unknown
 
Measuring the distance from ship to shore, using a quadrant marked with shadow-scales, 1598. Artist: Unknown
 
Method of measuring angles with a cross-staff, 1636. Artist: Unknown
 
Map showing the supposed location of Paradise. Artist: Unknown