Early 20th century, consisting of composite marble base supporting a cannon, adjustable magnifying glass, a raised dial, and gnomon. Such instruments can be calibrated so that the sun ignites a primed cannon at a specified time.

6-1/2 x 10 x 7-1/2 in.

Private Collection of an Antiquarian, Charlotte, North Carolina

One magnifier elevation arc broken on one side; good estate condition.