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Berkas:Galton whistle.jpg

Galton_whistle.jpg (502 × 429 piksel, ukuran berkas: 35 KB, tipe MIME: image/jpeg)

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Ringkasan

Deskripsi
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.
Tanggal
Sumber 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
Pembuat H. Winfield Secor

Lisensi

Public domain
Public domain
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.
United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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menggambarkan

sejak

Juni 1920Kalender Masehi Gregorius

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terkini20 Desember 2014 10.36Miniatur versi sejak 20 Desember 2014 10.36502 × 429 (35 KB)ChetvornoUser created page with UploadWizard

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