The paddle-wheel was between the two hulls, and near the stern of the craft.
Imagine a paddle-wheel placed in water and caused to rotate.
Branca's invention was simply a paddle-wheel turned by a jet of steam instead of by a water current.
It is to be propelled by the combined powers of the paddle-wheel and the screw.
Before passing onto the screw, it may be well to explain just how a paddle-wheel causes a boat to move.
She started up, choking and sobbing, and heard the engines throb, the paddle-wheel creak and splash.
The frame of wood which encircles the upper part of the paddle-wheel.
She had a rudder at both bow and stern, and was propelled by a paddle-wheel amidships, something like the Ark of Delft.
The jet of water did not prove any more successful, and but two other methods were available—the propeller and the paddle-wheel.
The first step towards the revolution was taken many years ago when the screw propeller was substituted for the paddle-wheel.