This is a hinged surveyor’s divider, brass with iron tips, and measures around 5″ long. For source and more details, click here.
Image from: http://www.nps.gov/history/museum/exhibits/revwar/image_gal/vafoimg/frameshell.html
This is a hinged surveyor’s divider, brass with iron tips, and measures around 5″ long. For source and more details, click here.
Image from: http://www.nps.gov/history/museum/exhibits/revwar/image_gal/vafoimg/frameshell.html