Model in several pieces, scale 1:12, of a rectangular marine boiler developed by Thomas Cochrane, the 10th Early of Dundonald, for use on the HMS 'Janus' consisting of 1) Sectioned funnel 2) two funnel tops 3) the life side of the sectioned boiler 4) the right side of the sectioned boiler Sectional model of tubular marine boiler and section of funnel 1844-1848