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| Toise of Paris | |
|---|---|
| Name | Toise of Paris |
| Quantity | length |
| Country | Kingdom of France; historically France, Burgundy, Kingdom of Navarre |
| Introduced | 12th century (standardized 1668) |
| Obsolete | partially replaced by metre (1799) in French Revolution |
| Base unit | foot (unit), pouce |
| Related units | aune, arpent, lieue, pied de roi |
Toise of Paris is a historic unit of length originating in medieval Paris and formalized in early modern France. It functioned as a regional standard for surveying, construction, navigation, and coinage, and played a central role in disputes over measurement between royal administration and local authorities. The toise's persistence into the 18th century influenced continental metrology and the adoption of the metre during the French Revolution.
The toise emerged during the High Middle Ages as part of a patchwork of European measures alongside the ell (unit), cubit, and foot (unit). Medieval Parisian guilds, including the Corporation des Maçons and Corporation des Mesureurs, used local oak standards for the toise in market regulation and building work near Île de la Cité and Notre-Dame de Paris. During the Hundred Years' War, royal officials such as Charles V of France and Charles VII of France sought to impose uniformity, prompting surveys by engineers linked to the Ordre du Roi and the Bâtiment du Roi.
In the 17th century, scientific figures such as Jean Picard and members of the Académie des Sciences measured the Paris toise to support geodetic surveys and cartography connected to Cassini family. The 1668 edict under Louis XIV of France and administrators like Colbert fixed the toise of Paris as the standard for royal works, aligning royal carpentry and architecture at the Palace of Versailles, Hôtel des Invalides, and municipal projects in Lyon and Marseilles. Internationally, instruments calibrated to the Paris toise informed expeditions by Louis XIV's protégés and later Enlightenment scientists including Alexis Clairaut and Pierre-Simon Laplace.
The toise of Paris was legally defined in relation to the pied de roi and subdivisions such as the pouce (inch) and ligne (line). Classical legal acts equated one toise to six pied de roi, with each pied divided into twelve pouces and each pouce into twelve lignes. Royal standards were physical brass or iron bars kept at the Bureau des Longitudes and imperial repositories such as the Paris Observatory and the Hôtel des Monnaies (Paris). Committees of the Académie Royale des Sciences compared these standards with geodetic baselines measured by Jean-Dominique Cassini and his successors to reconcile regional discrepancies with astronomical observations.
Comparators and gauge rods used during 17th–18th century campaigns relied on works by instrument makers such as Eustache Mangin and Etienne Lenoir (instrument maker). The legal toise differed slightly from local provincial toises, notably the toise of Charenton and the toise of St. Cloud, leading to litigation in courts like the Parlement of Paris and reforms under ministers such as Turgot and Necker in the pre-revolutionary era.
By statutory convention, 1 toise = 6 pieds de roi = 72 pouces = 864 lignes. The pied de roi itself equalled 12 pouces; pouces subdivided into 12 lignes produced fine gradation useful to craftsmen linked to the Gilds of Paris, Compagnons du Devoir, and shipbuilders at ports including Brest and Toulon. Surveyors used multiples such as the toise géométrique for triangulation and the toise d'arpent for land measurement; agrimensores and cadastre officials reconciled these with units like the arpent and the perche.
Precision measurement campaigns during the Enlightenment calibrated the toise against the length of a pendulum and astronomical constants measured at the Observatoire de Paris and by expeditions to places such as Lapland and Peru undertaken by scientists like Pierre Louis Moreau de Maupertuis and Charles Marie de La Condamine. These comparisons ultimately highlighted the need for a universal standard.
Municipal authorities and royal administrators required the toise in construction contracts for projects at Versailles, Les Invalides, and municipal infrastructure in Rouen and Nantes. Commercial law in provincial markets referenced toises for textiles denominated in aune and for timber measured by craftsmen registered with chambers such as the Chambre des Comptes.
During the French Revolution, revolutionary legislatures including the National Constituent Assembly debated metric reform, leading to the 1795 adoption of the mètre and the gradual abolition of traditional measures. Transitional legal acts allowed residual use of the toise in some contexts until full enforcement of metric laws by the Consulate and Napoleonic Code reforms around 1812; however, the toise remained in colloquial use and in foreign archives and instruments in Spain, Portugal, Belgium, and parts of Italy well into the 19th century.
The toise appeared on engraved standards, cadastral maps by the Cassini map (Carte de Cassini), and on coinage and medals produced by the Monnaie de Paris and medallists such as Jean Warin and Auguste de Montferrand who marked scales on plaques for architects. Bronze and brass toise standards became objects of civic pride displayed in hôtel de ville halls and museums including the Musée des Arts et Métiers.
Numismatically, some commemorative medals struck for surveying expeditions and royal building inaugurations bore inscriptions referencing the toise and portraits of patrons such as Louis XIV of France, Louis XV of France, and Louis XVI of France. Collectors and curators at institutions like the Bibliothèque nationale de France and private cabinets consider surviving toise bars and mounted standards important artefacts for studying pre-metric metrology and the material culture of early modern France.
Category:Units of length