Geometric lathe

This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Geometric lathe" – news · newspapers · books · scholar · JSTOR (April 2021) (Learn how and when to remove this message)

A geometric lathe was used for making ornamental patterns on the plates used in printing bank notes and postage stamps. It is sometimes called a guilloché lathe.

It was developed early in the nineteenth century when efforts were introduced to combat forgery, and is an adaptation of an ornamental turning lathe.

The lathe was able to generate intersecting and interlacing patterns of fine lines in various shapes, which were almost impossible to forge by hand-engraving. They were used by many national mints.

• Rose engine
• Security printing
• Guilloché
• Spirograph
• Tusi couple

• Peter Bower, 'Economic warfare: Banknote Forgery as a deliberate weapon', and Maureen Greenland, 'Compound plate printing and nineteenth-century bank notes, in Virginia Hewitt, ed. The Banker's Art: Studies in paper money, pp 46–63, and pp 84–87, The British Museum Press, 1995, (ISBN 0-7141-0879-0)

• Geometric chuck, 19th century, Science Museum Group Collection Online

This metalworking article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e