The "Ramsay" machine consists of a mild steel table of an annular form, the sides being of sheet steel, and riveted together with angle irons. The intervening space is intercepted periodically by steel stays. This circular table rests upon eighteen pairs of wheels, the axles being supported by bearings bolted to the table. A section through the table itself with its supports is shown in Figs. 241 and 242. The moulds which receive the liquid metal are fitted with small trunnions which fit into a pair of bearings on the rims of the circular table. The inner periphery is fitted with toothed segments, which form a complete circle for the purpose of revolving the whole apparatus. The toothed segments, which gear with the driving wheels, are shown in a, Fig. 241