c. By gravitation down an inclined or vertical road. See [Section 69].
d. By wind power, using sails or windmill. See [Section 95].
e. Animal power.
On water, vessels are propelled by:
a.
Wind.
b.
Steam or other heat engine.
c.
Wave motion.
c. By gravitation down an inclined or vertical road. See [Section 69].
d. By wind power, using sails or windmill. See [Section 95].
e. Animal power.
On water, vessels are propelled by:
a.
Wind.
b.
Steam or other heat engine.
c.
Wave motion.