Units of measurement in France before the French Revolution 4 parts in one million) than the "pied" used in France. According to the law of 19 Frimaire An VIII (December 10, 1799), Traditionally, the French pound ("livre") was defined as the mass of exactly of a French cubic foot of water. When the kilogram was defined, the knowledge that a "pied du Roi cube" filled with water masses exactly 70 French pounds was apparently lost. According to the traditional (cubic foot) definition, one "livre" would have been about 489.675 grams. According to the kilogramme definition, one "livre" was about 489.506 grammes. The difference is about 0.035%. However, a small
Bayonne–Saint-Jean-Pied-de-Port railway Bayonne–Saint-Jean-Pied-de-Port railway The Bayonne - Saint-Jean-Pied-de-Port railway is a French 52-kilometre long railway line, that connects the Bayonne to Saint-Jean-Pied-de-Port, running through the foothills of the Pyrenees. The railway was opened fully in 1898. The Bayonne - Saint-Jean-Pied-de-Port railway leaves the Gare de Bayonne in a southerly direction. It crosses the river Adour south of Bayonne town centre, and then splits with the Toulouse-Bayonne railway and Bordeaux-Irun railway. It continues through valleys within the Pyrenees until it reaches Gare de Saint-Jean-Pied-de-Port, its south-western terminus. The line opened in 3 sections between 1891 and 1898 as follows: Between 1930 and 1931