Galton pipe
The Galton pipe was invented by Sir Francis Galton and is an annular gap pipe with a body closed on one side and variable in length for generating high frequencies . The frequencies range from the range that is barely audible for humans to far into the ultrasonic range .
Galton pipes can be blown with the mouth, with a rubber ball or, if they are built into an organ, by machine.
Galton originally developed the whistle, which was blown with a rubber balloon, to determine the frequency that humans could just barely hear. With their help, he discovered high-pitched hearing loss in old age. It was also Galton who discovered in London Zoo that some animals can hear these high frequencies.
The Galton whistle, blown with the mouth, is only used for training animals such as dogs , cats and dolphins . The whistle is very good for animals and can be heard over great distances, but for humans it is very quiet or not at all. When used as a dog whistle, this greatly reduces any disturbance to the environment.
Individual evidence
- ↑ a b c Dirk Koch: Instrumentology. In: ENT questions and answers. Springer, Berlin, Heidelberg 2016, ISBN 978-3-662-49459-2 , pp. 310-311 ( online .)
Web links
- Galton Whilstle on the Hearing Aid Museum website with photos of Galton pipes