Which of the below is not an instrument used to set right angles?(a) Cross staff(b) Site square(c) Optical staff(d) Prism squareI have been asked this question by my college director while I was bunking the class.Asked question is from Chain Surveying in portion Basic Surveying of Basic Civil Engineering

Which of the below is not an instrument used to set right angles?(a) C

1.	Which of the below is not an instrument used to set right angles?(a) Cross staff(b) Site square(c) Optical staff(d) Prism squareI have been asked this question by my college director while I was bunking the class.Asked question is from Chain Surveying in portion Basic Surveying of Basic Civil Engineering
Answer» RIGHT option is (c) OPTICAL staff Best EXPLANATION: There is no INSTRUMENT like an optical staff.Optical square is an instrument which consists of circular box with three slits. Cross staff is a frame of the box mounted on a pole. Prism square is an advanced version of an optical square. Site square consists of TWO telescopes set at 90^os.

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