torsion balance

noun
an instrument for measuring small forces, as electric attraction or repulsion, by determining the amount of torsion or twisting they cause in a slender wire or filament.

Origin:
1820–30

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World English Dictionary
torsion balance
 
n
an instrument used to measure small forces, esp electric or magnetic forces, by the torsion they produce in a thin wire, thread, or rod

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Place centrifuge tubes on each pan of a suitable torsion balance.
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