score:16
What do you know! Thomas James Oertling wrote his 1984 M.A. Thesis on The History and Development of Ship's Bilge Pumps, 1500-1840.
Figure 21. A chain pump. The Cole/Bentnick chain pump shown above was developed in the last half of the 18th century. (Courtesy of the National Maritime Museum from the Admiralty Collection of Plans, #6562)