FIELD: musical alternative current signalling devices. SUBSTANCE: musical alternative current bell has a lot number of resonance members 9 (10-15 or more), mounted in the same housing successively in a common air stream. A simple device is provided for controlling the air stream; such device has a the glass or plastic tube 10 with periodically arranged openings, two plastic small pistons inside the tube, mutually joined by a strength filament. Upon operation of the bell the membrane pump 1 supplies a compressed air to the resonance member, being nearest to membrane pump. The resonance member begins to sound. Simultaneously the compressed air is being fed on one of the pistons 12, 13 in the control tube 10. The piston 12, being moved by reciprocation fashion, alternatively switches air feed to resonance members 9, providing their alternative sounding. EFFECT: enhanced quality of the bell. 2 cl, 4 dwg
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