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Some dog whistles have adjustable sliders for active control of the frequency produced. Trainers may use the whistle simply to get a dog's attention or to inflict pain for the purpose of behaviour modification. In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric ...
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 ...
However, Ian Haney López, an American law professor and author of the 2014 book Dog Whistle Politics, described Reagan as "blowing a dog whistle" when the candidate told stories about "Cadillac-driving 'welfare queens' and 'strapping young bucks' buying T-bone steaks with food stamps" while he was campaigning for the presidency.
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.
A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...
"A Very Silent Night" is a single released in New Zealand exclusively for dogs - created by creatives Colin Mitchell and Alex Dyer, now at rascals.co.nz. It is a world first [ dubious – discuss ] as the single can not be heard by human ears and can only be heard by animals that can hear outside of the normal human range - including dogs ...
RWBY Chibi is an American animated comedy web series produced by Rooster Teeth Animation for Rooster Teeth.It is a spin-off of RWBY, where each episode consists of several scenes where aspects of RWBY's characters are usually exaggerated for comic effect.
It was a little cocker spaniel dog in a crate that he'd sent all the way from Texas. Black and white spotted. And our little girl—Tricia, the 6-year-old—named it Checkers. And you know, the kids, like all kids, love the dog and I just want to say this right now, that regardless of what they say about it, we're gonna keep it. [47]