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A balance consisting of a scaled arm suspended off center, a hook at the shorter end on which to hang the object being weighed, and a counterbalance at the longer end that can be moved to find the weight.
(General Engineering) a portable balance consisting of a pivoted bar with two unequal arms. The load is suspended from the shorter one and the bar is returned to the horizontal by adding weights to the longer one
[C17: from steel + yard1 (in the archaic sense: a rod or pole)]
steel•yard(ˈstilˌyɑrd, ˈstɪl yərd)
a portable balance with two unequal arms, the longer one having a movable counterpoise and the shorter one bearing a hook or the like for holding the object to be weighed.