A Guilloché or engine turning pattern is an ornamental pattern formed of two or more curved bands that interlace to repeat a circular design, most commonly seen on banknotes. These patterns were traditionally used for security printing purposes as a protection against counterfeit and forgery, as well as for decorating valuable objects such as Fabergé eggs and pocket watches. The interlace pattern is called guilloche; the result isguilloché.

The devices used to make these patterns are variously called "rose engines" or "geometric lathes".

See also

• Roulette curve
• Spirograph
• Cloisonné

External links

• Pledge & Aldworth Engine Turners (http://www.pledge.co.uk) site on engine turning (click on Illustrated Engine Turning Reference in sidebar)
• http://www.maa.org/editorial/mathgames/mathgames_02_09_04.html
• http://mathworld.wolfram.com/GuillochePattern.html
• http://www.securitygraphics.com/guilloche.html
• http://www.rgmwatches.com/engine.html
• http://users.lmi.net/~drewid/PWR_engine_turning.html

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