Best results are obtained by using two electrically driven forks whose pitches are 256 dv. and 245 dv. when the currents admitted to each fork are regulated by means of rheostats. All the apparatus is placed in a sound-proof room; tubes conduct the sound to another room where the Os observe. The essential part of the procedure consists in varying the intensities of vibration of the two forks by means of the rheostats and getting introspective descriptions of what is heard in each situation.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Hauge, Ingvald B.
"Apparatus and Procedure Used in Determining the Nature of Beating Intertones,"
Proceedings of the Iowa Academy of Science, 34(1), 303-303.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/98