[Illustration: THE POWER PLANT OF AN AUTOMOBILE
The electric generator makes electricity to be used for starting the
engine and lighting the car.]
[Illustration: The magneto gives an electric spark, which explodes the
gasoline in the cylinders.
The water pump keeps water flowing around the cylinders to prevent them
from getting too hot. This water comes back to the pump through the
radiator at the front of the car. Wind blows through the radiator and
cools off the water. The tire pump on up-to-date cars is run by the
engine. It does not pump except when the gears, which are shown in the
picture, are pulled together.]
[Illustration: An electric motor starts the engine by turning the
fly-wheel. This makes it unnecessary to get out and crank the car by
hand.]
[Illustration: SECOND STAGE OF CONSTRUCTION
The transmission is added.
The transmission makes it possible to reverse the car. It also enables
the driver to go into high-speed gear when on level roads and low-speed
gear for starting and for pulling hills.]
[Illustration: Double-drop pressed steel frame.