Machines powered by animals were mainly used in mills, for grinding grains.
Machines converting the energy of flowing or falling water into useful forms of power were already in use in the Middle Ages.
Cereals are species of grasses cultivated for their edible grains.
Threshing machines are used for separating grains from straw.
Wind, as an external force, plays an important role in shaping deserts.
Wind, as an external force, plays an important role in shaping coastal areas and steppes.
Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.
A geyser is a spring characterised by intermittent discharge of water and steam.
Ancient Indians built huge, naturally ventilated storehouses.
Combine harvesters are machines that harvest and thresh grain crops.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
This animation demonstrates instruments used to examine atmospheric phenomena.
Solar power stations convert solar energy into electricity.
Two meshing gears transmit torque during their rotational motion.
Wind power stations convert the kinetic energy of the wind into electricity.
This animation demonstrates the structure and operation of impulse turbines.
This animation demonstrates the use of modern technology in agriculture.
Biogas can be produced from organic material (manure, plant waste, organic waste) using bacteria. Biogas is a mixture of methane and carbon dioxide; burning...
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.