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wye level[′wī ‚lev·əl]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A surveyor’s leveling instrument having a telescope and attached spirit level, mounted in Y-shaped supports which permit it to be lifted and reversed, end for end; it is used in the direct measurement of differences in elevation.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.