REDUCTION OF MACHINERY NOISE.

Thirty-one papers were presented at the conference, covering noise control fundamentals; sources of indoor and outdoor noise, noise measurement; potential hearing damage; control by absorption, enclosures, barriers and vibration isolators; and noise control of machinery and household equipment. Following is a list of titles and authors: Noise Control in the USA - The Present State of Affairs. By Malcolm J. Crocker. Sound Waves and Acoustical Definitions. By Joseph W. Sullivan. Sound Propagation, Indoors. By Fergus R. Fricke. Sound Propagation, Outdoors. By Vaidya. Ear, Hearing, Loudness and Hearing Damage. By William A. Cooper Jr. Instrumentation and Noise Measurements. By David R. Tree. Use of Anechoic and Reverberant Rooms for Measurement of Noise from Machines. By Malcolm J. Crocker. Noise Legislation and Regulations. By Malcolm J. Crocker. Noise Control Approaches. By Malcolm J. Crocker. Fundamentals of Vibration and Noise Control by Vibration Isolation. By James F. Hamilton. Noise Control by Use of Enclosures and Barriers. By Malcolm J. Crocker.