The NBS Sound Building, dedicated to the study of acoustic phenomena, featured a large anechoic chamber. Construction on the building began in 1965 and it was occupied early in 1968. The anechoic chamber was the quietest place on the NBS campus. It was lined with large fiberglass wedges paired in a pattern that absorbed more than 99% of the sound originating within the room. It was used for microphone calibrations, loudspeaker measurements, sound level meter calibration, noise measurement, psychoacoustic experiments, radiation and scattering experiments, and general use when a quiet environment was needed.
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