Screw propeller

The screw propeller is a device used to convert rotational motion into thrust that moves a ship forward, offering improved efficiency and durability over previous propulsion methods like paddlewheels.
 Robert Wilson England 1827 Screw propeller

The screw propeller is a device used to convert rotational motion into thrust that moves a ship forward, offering improved efficiency and durability over previous propulsion methods like paddlewheels.