"The boat now being built for the United States Government satisfies all the requirements detailed earlier in this article. It will have a length over all of eighty-five feet, and diameter of eleven and one-half feet; total displacement, one hundred and sixty-eight tons, and a light displacement of one hundred and fifty-four tons. The guaranteed speed on the surface will be fifteen knots, the speed awash fourteen knots, and submerged eight knots. At full speed the boat will have an endurance of twelve hours and a radius of action of one thousand miles at slower speed. The endurance, when submerged, will be ten hours at a speed of six knots. The boat will be propelled by triple screws, operated by three independent sets of triple-expansion steam engines, capable of developing 1625 indicated horsepower. There will also be electric storage batteries and a motor of 70 horsepower for submerged running. The armament will consist of two expulsion tubes and five Whitehead torpedoes. [Illustration: THE PLUNGER (HOLLAND TYPE SUBMARINE), LAUNCHED IN AUGUST, 1897 Machinery not drawn to scale. The engines of 1,600 horse-power, with the necessary auxiliaries, nearly filled the after portion of the vessel.] "Steering on the horizontal plane while submerged is accomplished by an automatic apparatus that performed very well in one of the boat's predecessors. Steering in the vertical plane is also done automatically, and with considerable exactness, while submerged. Steering in both planes can also, at the same time, be controlled manually. There will be a steel armored turret, four feet high, to protect the pilot and smokestack, and the hull will be covered by three feet of water while the vessel runs awash to attack.