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Origin and history

The Regard du Jongleur, located in Louveciennes (Yvelines), is a historic monument emblematic of French proto-industrial architecture. Built around 1683 by the engineer Le Jongleur, it is an integral part of the hydraulic system designed to supply the royal sites of Versailles and Marly with water. This isolated pavilion, built in large apparatus and covered with slates (which was probably redesigned in the 19th century), illustrates the technical ingenuity of the period. Its vaulted interior preserves the traces of the aqueducts from the tanks of Marly and Louveciennes, as well as the departure of the pipeline to Versailles.

Inside, the look reveals a system of partitioning and measuring water flow, supplied by both the Marly Machine and the local water supply. This system, which is essential for the management of water resources, demonstrates the strategic importance of Louveciennes in the royal water supply network. The building, registered with the Historical Monuments in 1999, is now owned by the municipality. Its sober architecture, combined with its technical function, makes it a rare vestige of 17th century hydraulic engineering.

The Regard du Jongleur is part of a broader context of infrastructure modernization during the reign of Louis XIV. The Marly Machine, to which it is connected, was a technological feat of the time, able to raise the Seine water for more than 150 meters to power the fountains of Versailles. This network, designed to meet the court's lavish needs, mobilized engineers like Le Jongleur, whose name remains associated with this iconic look. The monument thus embodies the link between technical innovation and royal power, characteristic of the Great Century.

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