d. Barges and rafts usually employ tidal motion only.
e. Rowing boats, &c., hand power paddle and screw boats, horse towage.
In air, balloons are propelled by:
a.
Wind, acting on the inflated balloon, or on an umbrella-shaped or other sail; also on the under side of inclined planes of large area.
b.
Balloons of elongated form have been propelled by an engine placed in the car, driving either a large screw propeller or wings.
c.
Various attempts have been made to work flying machines (generally having some form of wings) by the power of a man’s hands and feet, with very little success.
a. Wind, acting on the inflated balloon, or on an umbrella-shaped or other sail; also on the under side of inclined planes of large area.