File:Galton whistle.jpg
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Summary
| Description |
English: A Galton whistle, the first ultrasonic whistle or "dog whistle".. It was invented in 1876 by Francis Galton and used to test the hearing range of various animals. It consists of a whistle blown by the rubber bulb, with a small sound chamber whose size can be accurately adjusted by a plunger attached to a micrometer. The micrometer can be calibrated to give the frequency in hertz. |
| Date | |
| Source | Retrieved March 12, 2014 from H. Winfield Secor, "Oddities of Sound" in The Electrical Experimenter magazine, The Experimenter Publishing Co., New York, Vol. 8, No. 2, June 1920, p. 153, fig. 13 on http://www.americanradiohistory.com |
| Author | H. Winfield Secor |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:36, 20 December 2014 | | 502 × 429 (35 KB) | Chetvorno | User created page with UploadWizard |
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