In other words, the French introduced not only national standards, but a system of standards. It survives today as the metric system.

This criterion of gear selection is used in countries which have adopted the metric system and is intended to standardize gear selection. To define a gear's module, the pitch diameter (the teeth ...

In the meantime, a new system of weights and measures, developed by French scientists following the Revolution of 1789, gained increasing international use. This metric system had as its fundamental ...