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Surveying instruments
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The dissemination of the magnetic compass in the late Middle Ages and the demand for increasingly precise maps in the Renaissance drove the development of surveying instruments. Documents as early as the fifteenth century show the use of protractors fitted with magnetic needles for land surveying. These instruments were generally derived from the back of the astrolabe; in the following century, they were called polymeters, surveying magnetic compasses, theodolites, holometers, and graphometers. To this category, we can add the surveyor's square, which was more specifically designed, however, for plotting orthogonal alignments.

In the military sphere, the magnetic compass was also applied in the second half of the sixteenth century to a variety of instruments such as the radio latino, the archimetro, and the altazimuth square. A very popular instrument among seventeenth- and eighteenth-century surveyors was the plane table, which enabled them to simultaneously measure and draw the map of an area.

 
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Archimetro (Inv. 629) Surveying compass (Inv. 2508) Surveying compass (Inv. 1279) Surveying compass (Inv. 144)
Surveying compass (Inv. 3371) Theodolite (Inv. 149) Geometrical square (Inv. 121) Theodolite (Inv. 1356)
Graphometer (Inv. 151) Folding square (Inv. 1292) Ruler and graduated case (Inv. 694) Surveying compass (Inv. 3687)
Surveying compass (Inv. 1471) Surveying compass (Inv. 1280) Gimbaled compass (Inv. 2535) Box of mining instruments (Inv. 2538)
Reel (Inv. 617) Magnetic compass (Inv. 3182) Protractor (Inv. 3182) Surveying rods (Inv. 2536, 2537)
Box of mining instruments (Inv. 683) Surveying rod (Inv. 693) Proportional and surveying compasses (Inv. 2510) Theodolite (Inv. 154)
Theodolite (Inv. 150) Triangulation instrument (Inv. 645) Surveying instrument (Inv. 643) Surveying instrument (Inv. 691)
Graphometer (Inv. 3630) Surveying compass (Inv. 2527) Altimeter theodolite (Inv. 2528) Theodolite (Inv. 240)
Barrois compass (Inv. 656) Theodolite (Inv. 1278) Folding square (Inv. 3629) Magnetic compass (Inv. 1288)
Folding rule (Inv. 2514) Folding rule (Inv. 2511) Triangulation instrument (Inv. 668) Surveyor's square (Inv. 680)
Graduated ruler (Inv. 638, 3703) Surveying compass (Inv. 2506) Level (Inv. 701) Surveyor's square (Inv. 681)
Graphometer (Inv. 245, 3699) Alidade (Inv. 3603) Triangulation instrument (Inv. 3164) Surveying instrument (Inv. 152, 3165)
Clinometer (Inv. 148)        
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