This tool at Smith’s Tavern is a metal carpenter’s protractor. A protractor is a measuring instrument for measuring angles (usually in degrees). The carpenter’s protractor at Smith’s Tavern consists of a long metal ruler and a cast iron arm used to measure the angle. At the hinge to the ruler there is a round dial that most likely had at one point writing of 0-360 degrees.
If anyone does know more about this particular tool, please email the Historical Society with this much needed information.