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Galton whistle, the first "dog whistle" A dog whistle (also known as silent whistle or Galton's whistle ) is a type of whistle that emits sound in the ultrasonic range, which humans cannot hear but some other animals can, including dogs and domestic cats , and is used in their training .
For instance, the sociologist Barry Hindess criticized Josh Fear's and Robert E. Goodin's respective attempts to theorize dog-whistles on the grounds that they did not pass the Weberian test of value neutrality: "In the case of the concept of ‘dog-whistle politics,' we find that the investigator's—in this case, Fear's—disapproval enters ...
I found one book (The Dog, David Alderton) that says that dogs & humans hear down to about 20 Hz and that dog whistles around 30Hz are "virtually inaudible to the human ear"; another book (The New Dog Handbook, Hans-J. Ullman), says dogs hear 70Hz to 100Hz and that they can hear "soundless" dog whistles "in the supersonic range of about 30,000 ...
Their Tornado 2000 whistle is capable of easily reaching 122 decibels. J Hudson & Co was founded in the 1870s in Birmingham by Joseph Hudson (1848–1930) and his brother James Hudson (1850–1889). The company became a manufacturer of whistles and continues as Acme Whistles. Acme is the world's largest and most famous producer of whistles.
A lawsuit by former SWAT officer Timothy Colomey accused leaders of the LAPD tactical unit of working to conceal unlawful killings and retaliating against him when he spoke to internal investigators.
Joseph Hudson (1848–1930) was an inventor in Birmingham, England during the late 19th century and the founder of J Hudson & Co in 1870, later to become the world largest whistle manufacturer . Hudson entered a competition held by the Metropolitan police force in London in 1883 to design a better way of attracting people's attention.