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Compass A Compass generally consists of a (a) Magnetic Needle (b)Graduated Circle(c) A Line of Sight Types of Compass Prismatic Compass It is very valuable instrument and is commonly used for rough survey, when speed and accuracy is not the criteria, as for example rough traverse or preliminary survey for a road, it is less accurate then a theodolite, it is unreliable in magnetic rocks or iron ore. ... Read More »

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