Scale: 1:6. Model of a rolling machine (1829), for rolling and branding metal rods from which ships bolts were made. The model is made largely from steel and brass, together with wooden supports and baseboard. The whole model is mounted on a rectangular mahogany base which has been stained and varnished. The rolling mechanism consists of two elongated rollers each fitted with three semi-circular grooves, the middle one of which is corrugated and bears and impression of the naval broad arrow mark. The rollers are housed in a vertical steel and wooden support and can be adjusted in height by turning a pair of threaded bolts with holes for a T-bar. On either side of the roller is fitted a square peg on which an L shaped steel handle can be worked.