FIELD: acoustics, in particular, sound generation by bells in bell towers. SUBSTANCE: clapper of device is designed with regulated length fixed along clapper body with calculated counter weight. This results in possibility of clapper contact to bell housing during stroke in point which is located at straight line which connects center of clapper body to center of circle of inner surface of bell housing in order to eliminate rattling. EFFECT: increased power and purity of bell sound due to possibility of its mechanical tuning after manufacturing and during use. 1 dwg
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