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.
Counter balance weighing scale.
8 antique coin scale counterweights weights.
The spring scale was invented by richard salter a british balance maker around 1770.
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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Counter scale machine for shops weighing capacity.
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