For the purposes of this Chapter—
(a)the expression " new ship " means a ship the keel of which is laid on or after the 1st July, 1931, all other ships being described as existing ships;
(b)the expression " short international voyage " means an international voyage in the course of which a ship is not more than 200 miles from the nearest land;
(c)the expression " buoyant apparatus " means buoyant deck seats, or buoyant deck chairs, or any other buoyant apparatus, excepting boats, life-buoys and life-jackets.