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 > Humber Conservancy Board: Pilot Launches used by the Board > Conversion of m.l. 'Frank Atkinson' to diesel propulsion