While undergoing a series of voice pitch tests some three years ago in the Psychological Laboratory of the State University of Iowa, the author learned that in his own individual case, as in some others, there existed, according to the statement of the investigator, Mr. C. J. Knock, a consistent as well as persistent tendency to miss in a definite direction certain intervals of the musical scale. The instrument used in these tests was the Seashore tonoscope, an indicator of absolute pitch developed in some of its later stages at this University.
Proceedings of the Iowa Academy of Science
©1916 Iowa Academy of Science, Inc.
Dodd, L. E.
"A New Tonoscope,"
Proceedings of the Iowa Academy of Science, 23(1), 204-207.
Available at: https://scholarworks.uni.edu/pias/vol23/iss1/35