Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Humber Conservancy > Humber Conservancy Board: Technical drawings of Buoys, Launches, Lightvessels and other ships submitted to the Board by Manufactures and related papers > Spurn Lightship HCB LV 12 > J. 3504 'Humber Conservancy Board: Proposed Layout of Sound Emitter Control Equipment for No. 12 Lightvessel'