Mariotte.
(Completed 1912.)
The third experimental boat, of the Rodiquet type, built at Cherbourg. The displacement when submerged is 650 tons and the length about 200 feet. Petrol motors of 1,500 H.-P. drive her at 15 knots an hour on the surface and electric motors of 550 H.-P. at 10 knots when submerged. Her radius of action is 3,000 miles, and her armament seven 18-inch torpedoes, which can be fired from both bow and stern tubes. The complement is about 25 officers and men.