Lot 0014

Gilt bronze chariot clock, missing movement, Pierre Le Roy, H (Small R over a dot) de Madame

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Gilt bronze chariot clock, missing movement, Pierre Le Roy, H (Small R over a dot) de Madame

Item Details

Description

Gilt bronze chariot clock, missing movement, Pierre Le Roy, H (Small R over a dot) de Madame

Dimensions: 19.75 inches x 4.875 inches x 17.25 inches.
Marked on one wheel: Le Roy H (small R over a dot) de Madame.
A case that held a clock made by the 18th century French clockmaker Pierre Le Roy

(Wiki):Pierre Le Roy (1717 to 1785) was the inventor of the detent escapement, the temperature compensated balance and the isochronous balance spring. His developments are considered as the foundation of the modern precision clock. Le Roy was born in Paris, eldest son of Julien Le Roy, a clockmaker to Louis XV who had worked with Henry Sully, in which place Pierre Le Roy succeeded his father. He had three brothers: Jean Baptiste Le Roy (1720 to 1800), a physicist; Julien David Le Roy (1724 to 1803), an architect; and Charles Le Roy (1726 to 1779), a physician and encyclopediste.
In 1748, he invented a pivoted detent type of escapement, or detached escapement, which makes him the inventor of the detent escapement. This should not be confused with the detached lever escapement which was invented by Thomas Mudge circa 1755. He was distinguished principally in his mastery and improvement of the clock and chronograph, above all of the marine chronometer, in which he carried forward the pioneering work of John Harrison. He took a different approach from that of Harrison, believing that the way to achieve seaworthiness was to detach the escapement from the balance. He also differed from Harrison regarding his temperature compensation method, which used the variation of the rotation radius of the balance by modifying the diameter of the balance through bi metallic components, a method which would become a standard in chronometers. His technique for temperature compensation was highly efficient in that it worked without changing the length of the spiral balance spring, which he had discovered to be isochronous only at a precise given length (i.e. when frequency is independent of amplitude, so that a mechanical clock or watch runs at the same rate regardless of changes in its drive force, so it keeps correct time as the mainspring unwinds). Development of the modern marine chronometer. After having designed plans in 1754, he constructed his first chronometers by 1756, and accomplished his masterpiece in 1766. This remarkable chronometer incorporated a detached escapement, a temperature-compensated balance and an isochronous balance spring, innovations which would be adopted in subsequent chronometers. Harrison demonstrated a reliable chronometer at sea, but these developments by Le Roy are considered by Rupert Gould to be the foundation of the modern chronometer. Pierre Le Roys chronometer had a performance equivalent to that of the Harrison H4 chronometer. In 1769, after his chronometre underwent testing aboard the corvette Aurore, he was awarded the double prize offered by the AcadÃ©mie franÃ§aise for the best method of measuring time at sea. He succeeded in giving his instruments the greatest possible regularity by the discovery of the isochronous spiral spring, in which he was in competition with Ferdinand Berthoud.
He was the author of several valuable publications on the art and science of clock making and chronography, among them the Ã‰trennes chronomÃ©triques of 1760.

Condition

Ware to the gold. Missing movement.

Buyer's Premium

Gilt bronze chariot clock, missing movement, Pierre Le Roy, H (Small R over a dot) de Madame

Name: Gilt bronze chariot clock, missing movement, Pierre Le Roy, H (Small R over a dot) de Madame
SKU: 150068278
Price: 4000 USD
Availability: InStock

Estimate $100 - $200

See Sold Price

Starting Price $50

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