Roberval balance
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The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.
A Roberval balance made by W & T Avery Ltd. in England
Detail: the bottom horizontal beam is hidden under the protective cover
Center of mass
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In physics, the center of mass of a distribution of mass in space is the unique point at any given time where the weighted relative position of the distributed mass sums to zero. For a rigid body cont
Roberval balance
…are frequently depicted with the "pan" as a plate or peg protruding from the center of each vertical column— this is so that the balance can have a center of gravity that is in the actual center of the parallelogram and so that adding weights to these plates does not change that center of gravity. This produces the…
This toy uses the principles of center of mass to keep balance when sitting on a finger.