Page 94 - DK Children's Encyclopedia

Engines SEE ALSO

▸ ▸ Aircraft p.13
▸ ▸ Cars p.52
Engines power machines by turning fuel into movement. ▸ ▸ Factories p.97
Coal, oil, or electricity is heated to create energy. The ▸ ▸ Forces p.108
energy is then used to turn wheels or parts that move the ▸ ▸ Machines p.150

machine forward. There are three main types of engines. ▸ ▸ Ships p.224

▸ ▸ Trains p.260

Steam engine
The first steam engine 2. Steam 1. Fire A supply of coal
was built in 1712 to Steam and smoke The heat from the Coal is burned in a is stored behind
pump water out of escape through fire turns the metal firebox to the engine.
make a hot fire.
water from liquid
mines. Steam engines the chimney. into steam.
were used to power
factories and trains.

3. Piston
Steam flows into
this tube where it
pushes a moving
part called a piston.

4. Movement
The piston drives
the train’s wheels
forward.

Car engine Jet engine
Car engines burn gasoline or diesel. There are four Jet engines are used for aircraft. They work by squashing,
moving parts called pistons, which move up and down, heating, and speeding up air. This hot air is blasted out
making the car’s wheels turn. backward, pushing the aircraft forward.

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