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Sound shutters are more than a visual adornment of a tower.

The bell tower should be viewed as a ‘resonance room’ which also has an effect on the resonance of a bell. One and the same bell rings more pleasantly in an old stone tower than in a newly cemented tower. Sound shutters reinforce the ‘mixing of bell tones’ in a tower before they are beamed out to the nearby audio environment. The high partial tones are dispersed, the deeper partial tones are expanded and diffused.

 

A major advantage of sound shutters is the reduction of sound intensity in the immediate vicinity of the tower through shifting and directing sound frequences towards the medium and far distance. In this way, disputes with neighbours in the nearest vicinity can often be avoided.

 

Furthermore, properly constructed sound shutters prevent invasion by pigeons and the concomitant defilement and mess in the tower, as well as keeping out rain and snow.

 

As anyone who has ever rung a bell by hand knows, regular, beautiful ringing is not as simple as it looks. From a technical point of view, the bell behaves just like a pendulum and the clapper inside it like another pendulum, making it a pendulum inside a pendulum. Depending on the size of the bell and the type of headstock carrying it, well timed movements are required as well as a change of direction in the correct moment. In the case of a ‘free flying’ clapper, the clapper should ‘kiss’ the bell just before it changes direction.

 

 

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