Model of a Gun on a Slide and Pivot

Model of a cannon on a sliding and turning sled, on a baseboard, incomplete. The wooden cannon is 13.9 cm long, the bore is not drilled. The sliding carriage, narrower at the front than at the back, consists of two cheeks with four steps, connected by a trunnion and the axle boxes; the rear axle box is missing. The carriage has no wheels, but slides with the cheeks over the runners of the sled. The sled is a wooden frame with crossbeams at the ends and in the middle; it has rollers underneath for movement over the turning circles. The outer turning circle is laid on a raised wooden circle; the central elevation for the pivot bolt is missing. Scale 1:20 (estimate).