tyfon

(from the article `lighthouse`) A later compressed-air signal was the tyfon. Employing a metal diaphragm vibrated by differential air pressure, it was more compact and efficient ...
Found on http://www.britannica.com/eb/a-z/t/98

tyfon

typhon, tyfon Acoustical engineering, a loudspeaker horn that is actuated by compressed air or steam.
Found on http://www.wordinfo.info/words/index/info/view_unit/2205/
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