十六世紀頃のMidship bendについて(日本航海学会第8回講演会)

抄録

Ships nomally attain their greatest width in the middle and their greatest height at the ends, curving outward and downward from the ends towards the middle. The lower part of the cross Section of the galley was almost round in Shape and the long oars on both sides of the ship had to be made about twice as board as the hull below. Cannon, when first used, were fitted to galleys among the banks of rowers, such a type was clearly not suited for anything more than the needs of the Mediterranean. Vinice and Genoa had both built large carracks for their sea-trade, they were 'tumbled home'. because it was hard to get long lengths of timber for the purpose, and when two lengths had to be used the joints were a source of weakness and trouble. One of the main features of design was to settle the breadth and where the greatest breadth should be placed. The idea in Tudor days was to make the ship's shape below water conform to a cod's head and mackerel tail, then the fashion grew up to place the greatest transverse section of a ship midship bend (dead flat) some 40 per cent of the length on the gun deck from the bow. Contain details of the methods of drawing several typical midship bends.