The book surveys the development, construction, and administration of coastal lights from ancient fire-towers to modern pharoses and lightships, describing engineering of towers and illuminating apparatus, distribution and management of lights, notable examples in Britain and France (including Eddystone, Bell Rock, Skerryvore, and Cordouan), and auxiliary aids such as lightships, buoys, and beacons. It explains interior arrangements and keeper life, traces technological improvements in lamps and lenses, and outlines legal and organizational systems that govern maintenance. An appendix lists lights along the British and Irish coasts and provides practical accounts and illustrations drawn from examinations and contemporary sources.