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Drawing of a steelyard balance, a balance with unequal arms used to weigh things. The item to be weighed is hung from the shorter arm, and a counterweight slides along the longer arm until the scale is balanced. The position of the counterweight on the longer... Originally published in Edward Albert Bowser, An Elementary Treatise on Analytic Mechanics: With Numerous Examples (New York: D. Van Norstrand Company, 1884).