Answer Posted / rajiv chilamkurti

Auto Level & Dumpy level are the types of levelling instruments. Dumpy level is the older version, in which the staff is visible in riverse direction. Where as the auto level is newer version of Dumpy level in which the staff Reading is visible normally.

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in levelling operation the first site on any change point is back site the second site on any change point is fore site the line commenses with fore sight & closes with backsight the line comensses with back sight & closes with fore sigh

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