Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Humber Conservancy > Publications produced, or acquired by the Humber Conservancy Board > International Lighthouse Conference, 1929 > Conference of the Chiefs of Lighthouse Departments, London 1929: Recent progress realized in French Wireless Beacons by MM. A. Blondel, Inspecteur Général des Ponts et Chaussées, Membre de l'Insitut, et P. Besson, Ingénieur des Ponts et Chaussées