What is Wye level & Reversible level??

Question

thes r 2 different types of levels used in levelling..
plz give me the answer as soon as possible!!I need to submit this assignment 2morro !!
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Answer 1

They are both precision instruments used by engineers and others for levelling operations. Take for example the wye level. It is so called because its telescope is supported by a pair of wye rings. These rings can be opened for the purpose of turning the telescope or rotating it around its horizontal axis.
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