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abscissas accidental errors adjustment alternating current ammeter amperes apparatus arithmetical mean armature arrangement average begin binding posts break cardboard cell chronoscope clock commutator connected constant error control instrument corresponding curve determine difference direct current disc dynamo electric employed equal equation error curve Fechner's formula frequency galvanometer given gives grey hand intensity introspective kymograph laboratory lamp battery limen lower magnet magnitude means measure ment method of limits mixer motors movement needle noise observation ohms pendulum periment photometer plate pointer positive practice pressure probability psychology quantitative quantitative psychology reaction circuit reaction experiment reaction key recorded rheochord rheostat scale screen sensation sense distance sense-distances shown in Fig simple reaction sound hammer space error spring stimulus strip Suppose supraliminal tion tone two-point judgments unit upper variable vary vertical voltmeter volts Weber's Law weight wire