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

Transactions, Amer. Soc. for Metals, December, 1935. Proc. I. R. E., February, 1936. 349 350 BELL SYSTEM TECHNICAL JOURNAL Applications of X-Ray Photography in Industrial Development Work} J. R. TOWNSEND and L. E. ABBOTT. The fundamentals of X-ray technic as applied in developmental work of the telephone industry are outlined. A brief description is presented of the physics of X-rays, of the methods used to produce usable X-ray radiation, and of a typical industrial X-ray laboratory. Results are given of investigations at the Bell Telephone Laboratories to determine the sensitivity of X-ray methods of revealing internal defects in metals. 

Numerous examples illustrating the application of X-rays in telephone work are included, as well as a description of the use of gamma rays for industrial application. Principles of Measurements of Room Acoustics.4 E . C . W E N T E . The acoustic characteristics of a room can in great part be evaluated from a knowledge of the rate with which sound in the room dies down when emission from the source ceases. The physical principles underlying the relationship are briefly discussed. It is shown by specific examples that we can obtain valuable additional information about acoustics of a room by recording the sound level at one or more points in the room when the frequency of the sound is continuously varied. 

Visual Accompaniment.8 . R. WOLF. The principles of producing "Visual Accompaniments" to musical renditions for the theater are briefly described, as follows: (1) natural scenes for portraying the "musical mood" of the musical composition; (2) the changing and blending of beautiful paintings to interpret the mood, known as the Savage Method; and (3) the use of abstract color forms as a means of interpretation.