A cast iron and steel hand operated cutaway demonstration model of a single cylinder four stroke spark ignition engine with piston, cam operated overhead inlet and side exhaust valves, disc crank, cam operated make and break (incomplete), spoked flywheel and handle, on cast iron stand, finished in black and red -- 16½in (42cm) high; and a cutaway demonstration model of a steam cylinder, slide valve and motion, connecting rod and crank with spoked flywheel and handle, on cast iron stand, finished in black with gilt lining -- 15¾in (40cm) long. (2)