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For accurate levelling __________ is attached inside telescope in an automatic level.

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For accurate levelling __________ is attached inside telescope in an automatic level.

(a) Alinometer

(b) Compensator

(c) Cross hairs

(d) Double lens

I had been asked this question in examination.

The above asked question is from Equipments Used in Levelling topic in section Basic Surveying of Basic Civil Engineering

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Correct choice is (b) Compensator

The best I can explain: Compensator is also called stabilizer. It consists of 2 fixed prisms and it creates an optical path between eye piece and objective. It results in exact positioning of the line of sight due to gravity.

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