Rod

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ROD. A measure sixteen feet and a half long; a perch.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
"A builder's level is a two-man operation unless you have a standalone leveling base," says Wojtowicz "Without a tripod, one person looks through the level and another holds a leveling rod at the distance being measured band.
A detector mounted on a leveling rod intercepts the beam and converts it to a liquid crystal display (LCD) or light emitting diode (LED) readout.