Whistle

Details Whistle Whistle

1986-08-13

1987-12-01

Frankfort, Charles

Signals and indicators

Horns, whistles and compressional wave generators

116141, 446204, G01K 500

Patent

active

047096519

ABSTRACT:
A whistle having two chambers of different size so that each is capable of generating a sound different to that generated by the other. Each chamber is elongate and has an open mouth located at the same end of the whistle body. A mouthpiece extends angularly from that end of the body and has two open-ended passages extending therethrough, each of which has an open inner end located adjacent a respective one of the chamber mouths. The two passages are located in close side by side relationship and are arranged so that a stream of air emerging from their respective inner ends passes across a respective one of the two chamber mouths so that the two chambers generate sound simultaneously. The two chambers generate relatively high and low frequency sound respectively.

REFERENCES:
patent: 394243 (1888-12-01), Briggs
patent: 1059630 (1913-04-01), Poefzsch
patent: 1426945 (1922-08-01), Anderson
patent: 1723057 (1929-08-01), Myers
patent: 2331975 (1943-10-01), Hagopian
patent: 2555833 (1951-06-01), Vanaman
patent: 2754714 (1956-07-01), Folsom
patent: 3824949 (1974-07-01), Aquila
patent: 4194714 (1980-03-01), Schultz

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