Pt. I. Author: B.W. Bathe -- The First Four Thousand Years -- The Northern Longships -- Medieval Warships -- The Great Ships -- Oared Warships of the Sixteenth, Seventeenth, and Eighteenth Centuries -- The Armament of Sailing Warships -- The Galleon -- The Evolution of the Three-Decker -- Progress in the Eighteenth Century -- The Final Phase of the Sailing Warship -- Pt. II. Author: Donald Macintyre -- The Advent of the Steam Age -- Early Marine Steam Engines -- Armour Plate and Projectiles -- The Coming of the Big Gun -- The Pre-Dreadnought Era -- The Dreadnought Era -- The Turbine -- Cruisers and Gunboats -- The Development of Torpedoes, Torpedo Boats and Destroyers -- The Development of Submarines up to 1914 -- The First World War -- After Jutland -- The Washington Treaty -- Building Programmes for the Second World War -- The Aircraft Carrier -- The Development of Propulsion Machinery -- Warships of Today -- The Torpedo Today -- Submarines of Today.