Abstracts of Technical Articles from Bell System Sources (01 January 1936)

Physics, September, 1935. Physics, September, 1935. 172 ABSTRACTS OF TECHNICAL ARTICLES 173 enhances the effect. With an extreme preliminary anneal of 1400° C. for 18 hours specimens of 65 permalloy have been obtained with the record value of maximum permeability of 600,000. The magnetic characteristics of materials treated in this way are relatively insensitive to stress. These magnetic characteristics are, however, highly anisotropic; the maximum permeability in one direction is as much as 150 times as large as that at right angles. Newer Concepts of the Pitch, the Loudness and the Timbre of Musical Tones.3 Harvey Fletcher. 

It has generally been thought that corresponding to the three psychological aspects of a sound, namely, the pitch, the loudness and the timbre, there are the three physical aspects of a sound wave, namely, the wave-length, the amplitude and the wave form. Although it is true that there is such a correspondence in a very approximate way, when the matter is examined more closely it is found that each of the psychological aspects depends upon all three of the physical properties of the sound wave. In the paper it was shown how loudness can be defined in a quantitative way and measured by experimental methods which are described. From such measurements a relation has been found between loudness as it is ordinarily understood by the lay man and the physical intensity. In the higher intensity regions it is found that if the intensity of a sound is increased 1000-fold then the loudness will be increased 10-fold.