Circumferentor: Historical Surveying Instrument Explained #81947 (License: Personal Use)

This vintage woodcut depicts a surveyor’s hand operating a circumferentor, a precision instrument featuring a graduated circular dial marked in degrees and a sighting arm for angular measurement. The device was commonly employed in land surveying before modern theodolites, especially during the 18th and 19th centuries, often alongside field notes and compasses. The adjacent text defines “circumference” and related terms, reflecting how technical vocabulary and tools were taught together in historical manuals.

Used on educational or historical pages about surveying, cartography, or antique scientific instruments; matches user intent to learn about pre-modern measurement tools, etymology of geometric terms, or the evolution of geospatial technology.