Galton's whistle
التعريفات والمعاني
== English ==
=== Alternative forms ===
Galton whistle
=== Etymology ===
It was invented in 1876 by Francis Galton.
=== Noun ===
Galton's whistle (plural Galton's whistles)
Synonym of dog whistle (“high-pitched whistle”).
=== References ===
Galton's whistle on Wikipedia.Wikipedia