Julien Roy

Julien Roy , born with Turns in 1686, died with Paris in 1759, is a French scientist, Horloger of the king Louis XV.

He was admitted, in 1713, in the corporation of the clock and watch makers of Paris. He succeeds in removing with the English their superiority in clock industry, and Voltaire could say to the one wire of Roy, shortly after the Bataille of Fontenoy: “The marshal of Saxony and your father beat the English. ”

Specialist in the repeating watches, Roy improved the compensator of the pendulums and invented public the clocks known as " horizontales". One owes him also the universal dial with compass and with sights, the horizontal dial universal, suitable to trace the meridian ones, etc It is named clock and watch maker of the king in 1739.

It had four wire which were also made a name in arts:

Pierre, clock and watch maker, born with Paris in 1717, died in Vitry, close to Paris, in 1786. He discovered the isochronism of the spiral spring and managed to build instruments of the greatest regularity;
Jean-Baptiste, physicist, born and died in Paris (1719 - 1800). Named, in 1751, assistant geometrician of the Academy of Science, he was boarder in 1770; he invented the first positive and negative electric machine which was used;
Charles, doctor, born and died in Paris (1726 - 1779). He studied, then professed medicine with Montpellier with a great distinction;
Julien-David, architect, born and died in Paris (1728 - 1803). Grand Prix of architecture, it visited the Italy and the Greece, turned over in France in 1758, and was named professor with the Académie of architecture. One has of him: Ruins of the most beautiful monuments of Greece (1758); History of the provision and the forms which the Christians gave to their temples (1764); Navy of the former people explained , etc (1777).

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