[Structure and Operation of Paddle Wheels.]

[Configuration and Action of the Screw.]

[Comparative Advantages of Paddle and Screw Vessels.]

[Comparative Advantages of different kinds of Screws.]

[Proportions of Screws.]

[Screw Vessels with full and auxiliary Power.]

[Screw and Paddles combined.]

[CHAP. X.--EXAMPLES OF ENGINES OF RECENT CONSTRUCTION.]

[Oscillating Paddle Engines.]

[Direct acting Screw Engine.]