{ "items" : [
    { "id" : "http://dbpedia.org/resource/Composite_ship"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The technique of composite ship construction (wooden planking over a wrought iron frame) emerged in the mid-19th century as the final stage in the evolution of fast commercial sailing ships.Construction of wrought iron hulled vessels had begun in the 1820s and was a mature technology by the time of the launch of the SS Great Britain in 1843."] } } }
