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A VOICE KEY * This fact has been checked by Mr. Allen Fallanan in connection with a student project in experimental psychology. 1 The writer is indebted to Professors LeRoy T. Anderson and Victor L. Sherman, and also to Emil Richter, technician, all of the Departments of Engineering of Lewis Institute, for their assistance in the final layout of the apparatus. * Guardian Elect. Mfg. Co., serial no. 19934. 'Automatic Elect. Co., Z-D321865.* Better results may be obtained without the resistance at all; the stimulusresponse situations are usually so brief that the overload will not cause any appreciable damage to the relays.

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