A French Noon-day Gun, Probably Late 19th Century

A French Noon-day Gun
Probably Late 19th Century
Comprising a tapering brass cannon barrel with raised mouldings, long groove to the vent, knob-shaped cascabel, plain trunnions, and retaining its brass cover, mounted on a rectangular brass bed, adjustable circular magnifying glass acting against a D-shaped graduated mount on each side engraved with the 22nd day of each month, on a large circular composition base with applied beaded brass border, the top incised with a numbered scale on both sides, each scale with an adjustable brass gnomen
Base 46 cm. diam.