board rule

noun Building Trades.

a measuring device having scales for finding the cubic contents of a board without calculation.

Origin of board rule

An Americanism dating back to 1840–50

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for board rule

board rule

noun

a measuring device for estimating the number of board feet in a quantity of wood

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012