Abstract: A dog whistle comprises a body formed in two parts (2,3) and provided with a mouthpiece (4) which communicates through an air passage (10) with a sound chamber (5) having a vent (6) provided with an air splitter (9), the air passage containing a ramp (8) which directs the airflow produced by blowing the whistle into the sound chamber and towards the air splitter which thereby produces a whistling sound. The chamber produces sound having a narrow frequency bandwidth lying in the range 400 to 800 Hertz, preferably about 400 Hertz. The diameter of the sound chamber is within about 10% of its length and the ramp is at an angle of less than 8°, preferably 4° 30′, to the axis of the air passage. The angle of the surface of the air splitter is greater than 38° preferably 55°.

Abstract: A whistle of generally mandolin shape is adapted for adjustable mounting or seating on one's hand, wrist or forearm, or on a bulky sports glove or the like in a position facilitating convenient blowing of the whistle. A bracket is fixed generally tangentially to a generally cylindrically shaped whistle chamber portion of the whistle and has openings therethrough to receive a flexible strap that facilitates mounting of the whistle on one's hand, wrist or forearm, or on a bulky glove or the like with a mouthpiece portion of the whistle extending outwardly for convenient access for blowing. The strap defines a plurality of transverse ridges along its length that cooperate with the bracket to substantially prevent movement of the whistle along the strap when the strap is in a longitudinally taut condition.

Abstract: A comprising a body (1) provided at each end with a mouthpiece (3',6) having an air passage which communicates with a sound chamber (4,5), the chambers each being provided with a vent (V.sub.1, V.sub.2) in which is located an air splitter arranged so that air blown into the chamber through the associated mouthpiece is directed to the air splitter. The two vents (V.sub.1, V.sub.2) open at opposite sides of the body (1) so that the whistle can be blown from either end with the associated air vent exhausting in an upward direction by rotating the whistle about a generally horizontal axis when changing ends. One of the sound chambers (5) contains a pea and is provided with a protuberance (3c) arranged to project into the associated vent (V.sub.2) to prevent the pea becoming stuck in the vent. This chamber is of conical shape at one end.

Abstract: A referees sports whistle of mandolin shape is provided which has three rectangular whistle chamber elements of the same order of length contained within the mandolin shape of the whistle and arranged side-by-side in a common plane. An exhaust port is provided on the top surface of the whistle to exhaust air, blown into the whistle chamber elements, entirely through the top of the whistle. The whistle is manufactured from two separately moulded parts comprising a first top cover portion including the exhaust port and a second part comprising a main body part including a bulbous portion to be gripped at the sides thereof by the user.