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How many types of cross staff are available?

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in Basic Civil Engineering by (111k points)
How many types of cross staff are available?

(a) 2

(b) 5

(c) 3

(d) 4

I have been asked this question by my school principal while I was bunking the class.

This intriguing question originated from Chain Surveying in division Basic Surveying of Basic Civil Engineering

1 Answer

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Best answer
Right answer is (c) 3

For explanation: The three types are open cross staff, French cross staff and adjustable cross staff. Open cross staff has two vertical, opposite slits. French cross staff consists of a hollow octagonal box. The adjustable cross staff consists of two cylinders of equal diameter, one placed on top of the other.

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