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A swazzle (swozzle, schwazzle or swatchel) is a device made of two strips of metal bound around a cotton tape reed. The device is used to produce the distinctive harsh, rasping voice of Punch in a Punch and Judy show, and is held in the mouth by the professor (performer).
The swazzle is positioned between the tongue and the roof of the mouth so that expired air passes between the two metal strips, causing the reed to vibrate. Deft movements of the tongue allow the Professor to move the swazzle in and out of position, allowing him to switch between voices. The swazzle must be soaked in beer, water, or saliva before use.
Because the swazzle is small, positioned in the back of the mouth and must be repeatedly moved during a performance, there is a risk that it may be swallowed while in use. In order to minimise the risk of swallowing, some Professors attach a length of cotton thread to their swazzle so that it can be pulled back if it slips into the throat. In series 3, episode 11 of the British panel show 'QI', presenter Stephen Fry said that a Punch and Judy performer must accidentally swallow a swazzle at least twice before being considered a 'professor'.
The design of the swazzle was once a secret guarded by the Professors and only taught to those with a genuine respect for and interest in learning the performance of Punch and Judy puppetry. The device can now be bought from joke and magic shops although those made according to the traditional design are smaller and are generally considered superior.