Tin whistle all the holes closed, the whistle generates its lowest note, the tonic of a major scale. Successively opening holes from the bottom upward produces the rest of the notes of the scale in sequence: with the lowest hole open it generates the second, with the lowest two holes open, it produces the third and so on. With all six holes open, it produces the seventh. As with a number of woodwind instruments, the tin whistle's second and higher registers are achieved by increasing the air velocity into the ducted flue windway. On a transverse flute this is generally done by
Whistle Ward and A. De Courcy & Co. In 1987, Ron Foxcroft released the Fox 40 pealess whistle, designed to replace the pea whistle and be more reliable. Human whistling unaided by any instrument can be used for musical recreation or as a whistled language for communication over distances too great for articulate speech, among many other purposes. Musical instruments include the nose whistle or nose flute, the tin whistle and the slide whistle. Since a whistle produces a loud sound that carries over a great distance, whistles are useful for signalling. On ships, the boatswain's call is used to alert