Guilloché

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

See also

• Roulette curve
• Spirograph
• Cloisonné

External links

• 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