Salı, 09:05 
Great Lighthouses of Ireland
Cromwell Point Lighthouse
Lighthouse technology is constantly evolving, ensuring that lights are as bright as possible for the safety of the mariner at sea. This episode explores the fascinating history of lighthouse optic engineering and ingenuity, from the basic oil burners and reflectors of the 1700s, to the invention of the Fresnel lens which dramatically enhanced the power of the light.