☙
An early unit of acoustic pressure, or perhaps loudness. It is apparently named for the German physicist Heinrich Georg Barkhausen (1881 – 1956), and may be identical with the phon, which was introduced in the 1920's by Barkhausen. We have not been able to find any information on the unit's definition or magnitude.
This unit is mentioned by Sacerdote in the Giorgi Proceedings.
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Last revised: 1 May 2006.