Portable equatorial sundial 1767 - 1795

This portable equatorial sundial, crafted by Lorenz Gräsl between 1767 and 1795, is a fine example of 18th-century scientific instrument making. The sundial, made of brass, consists of a compass, a gnomon, and a graduated dial for measuring time based on the position of the sun. The dial is designed to be adjustable to different latitudes, making it suitable for use in a variety of locations. It is currently held in the collection of the Metropolitan Museum of Art.