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from The Century Dictionary and Cyclopedia

  • n. In experimental psychology, a noiseless break-key used in experiments on tapping. An elastic brass strip, mounted on a wooden block, carries a button for the finger; a platinum point on its upper surface is in contact with a platinum plate on a brass stop fixed above it; and the whole key is incased in a rubber bag packed with felt. A very small pressure on the button breaks the circuit without noise.


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