దిక్సూచి

వికీపీడియా నుండి

A simple dry magnetic pocket compass

దిక్సూచి (Compass) దిక్కులను సూచించే యంత్రం.

దీనిలో అయస్కాంతపు సూచిక ఉంటుంది. ఇది భూమి యొక్క అయస్కాంత క్షేత్రం ఆధారంగా ఉత్తర దిక్కును సూచిస్తుంది. దిక్సూచి మూలంగా సముద్ర ప్రయాణాల సామర్ధ్యం పెరిగింది మరియు చాలా ప్రమాదాలు తగ్గాయి.[1]

A compass is any magnetically sensitive device able to indicate the direction of the magnetic north of a planet's magnetosphere. Often compasses are built as a stand alone sealed instrument with a magnetized bar or needle turning freely upon a pivot, or moving in a fluid, thus able to point in a northerly and southerly direction. An early compass was invented in ancient China before 1044. The dry compass was invented in medieval Europe around 1300.[2] This was supplanted in the early 20th century by the liquid-filled magnetic compass.[3]

Other, more accurate, devices have been invented for determining north that do not depend on the Earth's magnetic field for operation (known in such cases as true north, as opposed to magnetic north). A gyrocompass or astrocompass can be used to find true north, while being unaffected by stray magnetic fields, nearby electrical power circuits or nearby masses of ferrous metals. A recent development is the electronic compass, or Fibre optic gyrocompass, which detects the magnetic directions without potentially fallible moving parts. This device frequently appears as an optional subsystem built into GPS receivers.



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