SILENCE PLEASE
MUFFLING MOTOR HORNS
By agreement with the Government the manufacturers of horns have consented to make no horn that will have a louder sound than 10(1 phons at a distance of 20 Sect. A phon is a scientific measuiemenl of tile loudness of a noise. As few unscientific people know what a phon is, the sound of 100 phons may best he represented bj comparison with other sounds. Ail aero engine at the same \listance of 20 feet has a loudness of 110 to 120 phons. A pneumatic drill rises from 105 to 110 phons. In the inside of a tube train the sound is equal to 95 phons. Loud conversation is represented by 60 to 75 phons; but the conversation between friends in a quiet house averages only 2.) phons.
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https://paperspast.natlib.govt.nz/newspapers/BPB19400105.2.37
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Bay of Plenty Beacon, Volume 2, Issue 106, 5 January 1940, Page 7
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133SILENCE PLEASE Bay of Plenty Beacon, Volume 2, Issue 106, 5 January 1940, Page 7
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