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
Negative feedback
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Negative feedback occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in t
Feedback loops in the human body