Condition: The glass in the centre is original and intact, a sight vane and magnetic compass needle are missing. There are no markings on the back of the instrument.
Brass surveying compass consisting of a circular plate whose circumference carries a 360-degree scale divided into four quadrants engraved names of the winds in Italian. At the center is the compass complete with glass but lacking the magnetic needle engraved with hour scales from 10-23, around a pin gnomon. The compass rotates with a pin-hole sight vane mounted opposite a half-square frame with three sight vanes mounted 90° apart (one vane missing) and rotated over the circular plate.
Diameter: 20x20cm ca.
Origin: mid-Adriatic coast of Italy.
Literature: (ed) Giorgio Strano, Stephen Johnston, Mara Miniati and Alison D. Morrison-Low (2009) European Collections of Scientific Instruments, 1550-1750, Vol. 10.
Mara Miniati (1990) Museo di Storia Della Scienza - Firenze Catalogo
For a similar 17th-century surveyors compass see the Medici Collection of Mathematical Instruments, Florence/Museo Galileo Catalogue inv no. 3371 & 2506 https://catalogue.museogalileo.it/object/SurveyingCompass_n03.html
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