![[Picture: stock block: scales, or equal-arm balance.]](https://www.fromoldbooks.org/Various-TypographicOrnaments/pages/524-scales/524-scales-q85-1318x1141.jpg "[Picture: stock block: scales, or equal-arm balance.]")
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In an equal arm balance like this one you can compare the weights of things in the two pans; often you use a set of standardized weights in one pan and add them until the lever at the top is level, indicating both pans contain the same total weight.
This picture was originally sold as a “stock block” or “stock cut”—that is, a form of clip art in which metal printing-blocks were sold by catalogues to printers.
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