An early 19th-century bronze moon cannon dial, signed on the marble base Chevallier Ing'r. Opti'en de SM Le Roi de Westphalie apat'is, the hour dial divided 5-12-7 the brass gnomon set for 47 North, the arc with monthly calendar scale, the burning glass fixed to two shaped arms, the base 9in. (22.5cm.) diam.