WordReference Random House Unabridged Dictionary of American English © 2026
null meth′od, 
  1. Electronics, Electricitya method of measurement using an electrical device, as a Wheatstone bridge, in which the quantity to be measured is balanced by an opposing known quantity that is varied until the resultant of the two is zero.
  • 1870–75

WordReference Random House Unabridged Dictionary of American English © 2026
Wheatstone bridge′, [Elect.]
  1. Electricitya circuit for measuring an unknown resistance by comparing it with known resistances.
Also, Wheatstone's bridge′. Cf. bridge (def. 9), null method. 
  • named after C. Wheatstone 1870–75

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