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Water-mill in Golden era:
The water-mills were also invented in the classical period. But they came to be widely used only in the Middle Ages. The wind-mills and water-mills harnessed nature for performing mechanical work. These mills were used for grinding grains, extracting oil from seeds and drawing water from wells, thus helping agriculture. They were also used for blowing bellows, forging iron or sawing wood. Mills became so popular that a mill and a miller were found in every lord's domain. The task of making and servicing the wind and water-mills was beyond the skill of most village smiths. Therefore, there grew a trade of mill-wrights who went about the country, making and mending mills. These men were the first mechanics who knew all about the making and working of gears. They also had a hand in the development of mechanical clocks and watches. There were two navigational invent~ons, the compass and the sternpost rudder, that had a profound impact on sea voyages in the Middle Ages. The earlier sea trade routes were along the coastline of various countries. With these two inventions, the oceans were thrown open to trade, exploration, and even war for the first time. Open-sea navigation quired accurate charts of the position of stars, latitudes etc. and gave an impetus to later developments in astronomy and geography. It also raised the urgent problem of finding the longitude. The need for compasses and other navigation instruments brought into being a new skilled industry.
Ventures in Space: Sometimes the atmospheric conditions distort the light or radiowaves coming in from space. For instance, there may be a storm disturbing the radiowaves. O
Does a piece of glass reflect more light than a piece of paper?
Fibre optics: The songs you hear on your transistor, or the pictures you see on your TV are canied from the studios to your home on radiowaves. Telephone calls you make, on th
This mineral has the name "bloodstone" because it provides a deep red color on a streak test. What is its chemical formula? Fe 2 O 3
Explain the Organs of the Urinary System The figure illustrates the organs of the urinary system. As is evident, the organs of the urinary system consist of 2 kidneys, 2 uret
1.Explain the importance of social stratification and the assumptions that underlie the concept. 2.Choose one influential sociological theory and explain its view of stratificat
describe the factors which decide the broad area of scientific activity?
Types of Diseases As we have indicated above. there are diseases,that a person is born with, for example, a baby may have a defective heart at the time of its birth. Then t
a ray of light falls on a transparent slab of refractive index u.if the reflected and refracted rays are mutually perpendicular to each other,find the angle of incidence.
Advantages of water in chemical weathering Water is an essential factor of chemical weathering and when it contains dissolved salts and acids it is all the more effective. It
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