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Fog Signals
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Measurements have recently been made in cooperation with the Lighthouse Service on a number of different types of fog signals at Cape Henry. These measurements indicate that air borne sounds, as now produced, will never give adequate protection to shipping. A large number of observations were made by a number of observers on relative loudness of different types of signals. The relative loudness was also determined by matching with a Western Electric 2 A Audiometer. Making use of the curve worked out by Fletcher relating loudness to loudness level in decibels, the loudness level as determined with the aid of the audiometer has been converted into loudness and compared with the average value obtained by the various observers.
Acoustical Society of America (ASA)
Title: Fog Signals
Description:
Measurements have recently been made in cooperation with the Lighthouse Service on a number of different types of fog signals at Cape Henry.
These measurements indicate that air borne sounds, as now produced, will never give adequate protection to shipping.
A large number of observations were made by a number of observers on relative loudness of different types of signals.
The relative loudness was also determined by matching with a Western Electric 2 A Audiometer.
Making use of the curve worked out by Fletcher relating loudness to loudness level in decibels, the loudness level as determined with the aid of the audiometer has been converted into loudness and compared with the average value obtained by the various observers.
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