A beam balance or beam scale is a device to measure weight or mass these are also known as mass scales weight scales mass balances weight balances or simply scales balances or balance scales.
Counter balance weighing scale.
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The spring scale was invented by richard salter a british balance maker around 1770.
Counter scale machine for shops weighing capacity.
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It is only starting in the late 18th century that new ways to measure mass appeared that didn t rely on counter weights.
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The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum one plate holds an object of unknown mass or weight while known masses are added to the other.
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The weighing scale didn t know any major technological improvements until the industrial era.