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 > Buoy Servicing Vessel 'Queen' > Buoy Servicing Vessel 'Queen' 2A: Drawing regarding propulsion and other on board equipment