As private yacht-owning is a pastime in which only the wealthy can indulge, and as almost all private yachts are built to suit the fancy of their owner, a considerable individuality is displayed by them. They range in size from vessels not bigger than a ship’s boat to ocean-going liners. The _Winchester_, the latest boat of her class yet devised, is a triple-screw turbine yacht, bearing a strong resemblance to a torpedo boat. Her dimensions are: length 165 feet, breadth 15³⁄₄ feet, depth 9³⁄₄ feet, and displacement 180 tons. She was built in 1909 for Mr. W. P. Rouss, a prominent member of the New York Yacht Club, by Messrs. Yarrow and Co. of Scotstoun. The propelling machinery consists of three Parsons marine steam turbines constructed by Messrs. Yarrow. She has two Yarrow water-tube boilers, and her furnaces are fitted to burn oil fuel. The hull is of steel. At her trials at Skelmorlie she easily maintained a speed of 26³⁄₄ knots, which was ³⁄₄ of a knot in excess of the speed stipulated in her building contract; and it was believed that a much higher rate could have been achieved, as 250 lb., the full working pressure of her boilers, was not reached, the high pressure of her high-power turbine being only 160 lb. The _Iolanda_, of about 2000 tons yacht measurement, was built for an American owner in 1908, and was then stated to be the second largest privately owned yacht in the world. She was both constructed and engined by Messrs. Ramage and Ferguson, Ltd., Leith. Her length over all is about 305 feet; beam 37 feet 6 inches; depth 23 feet. Her twin-screw machinery is of the triple-expansion four-crank type of 3000 to 4000 indicated horse-power. Her boilers are partly cylindrical marine return tubular and partly water-tube. This combination, the first installed in any yacht, affords the advantage of being able to raise steam and get under way at practically a moment’s notice, or provides additional speed at short notice when required, while the bunker capacity of some 550 tons gives the yacht a very extensive ocean-steaming radius. She is provided with motor and steam launches, quick-firing guns, electric-lighting apparatus, which is accredited as being the largest ever installed in a private yacht, and includes arrangements for manipulating the Marconi wireless telegraphy.