MODERN STEAM PRACTICE . 930 about 8 feet below the water level . Besides this she can discharge other torpedoes at each side . She is divided into a great many compartments by suitable bulkheads , and in her bottom keel , if we may so call it , she will carry blocks of cast iron each weighing 20… … Fig . 666 . — Armour Plating of the Polyphemus . will be covered with scale armour secured to 2 - inch plates . This scale armour consists of a series of tiles or plates , each 10 * 4 by 10 inches by ^ inch thick , made of Whitworth compressed Steel . The tiles are secured , as shown in Fig . 666 ,…
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