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 people cannot hear but dogs and cats can. It is used in the training of dogs and cats. It was invented in 1876 by Francis Galton. The whistle was mentioned in his book Inquiries into Human Faculty and its Development[1] in which he describes experiments to test the range of frequencies that could be heard by various animals,
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
Dog Whistle
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