Diaphone: Difference between revisions

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'''3-2-115
'''urn:mrn:iala:dic:3-2-0115'''


A fog signal operating on the principle of periodic release of compressed air controlled by the reciprocating motion of a piston operated by compressed air.
equipment producing a characteristic sound using a reciprocating piston with vents operated by compressed air. Output can be in the form of two tones at different sound levels, the second tone being at a lower frequency. If there is only one tone, it ends in a suddenly lowered pitch known as a “grunt”. 


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Latest revision as of 08:36, 17 September 2026

urn:mrn:iala:dic:3-2-0115

equipment producing a characteristic sound using a reciprocating piston with vents operated by compressed air. Output can be in the form of two tones at different sound levels, the second tone being at a lower frequency. If there is only one tone, it ends in a suddenly lowered pitch known as a “grunt”.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)