Model of a Furnace for a Steam Engine; Model of a device for mechanically firing a boiler; a container with a movable bottom; operated by a handle with a catch on a gear wheel; is filled with coal through a small door; the bottom is jacked up and the coal is transported from below to the grid; two of the contents of the tray are scooped up by two movable parts of the grid. 1:10 scale (derived).; Rijkswerf Rotterdam; 1844 and/or c. 1840; wood (plant material); brass (alloy); h 8.2 cm x w 19.5 cm x d 10.8 cm