From Wikipedia, the free encyclopedia
Its origin probably lies in 2/3 of a centimeter being very close to a quarter of an inch ; a French inch "pouce-roi" is around 27mm, a quarter of that is 6.7mm, close to 6.6 mm defined for the Paris point.
- "Louis Drevet". "Une petite histoire des poits et mesures". Retrieved 18 August 2011.
|This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it.|