Lot No. 316* (89th Auction)
Breguet & / Aimé Jacob, Paris, Movement No. 10156, circa 1860

A very fine and rare, ebonized, 30-day going seconds-beating regulator
Case: oak, ebonised; rectangular with moulded base on four pressed ball-feet, the trunk with glazed paneled doors; tiered and moulded cornice. Dial: enamel, inner chapter ring with radial Roman hours, centre seconds, winding aperture at "6", blued Breguet hands. Movm.: solid rectangular brass movement, ébauche: Aimé Jacob, signed "Breguet &", five-wheel train, modified Graham dead-beat escapement with jeweled pallets, heavy single weight, suspended from a double suspension spring mounted to a heavy iron cast bracket fixed to the case, heavy cylinder pendulum bob mounted to wooden rod with micrometric beat adjustment.

The solid disc pendulum with a wooden rod was often used for the so-called "régulateurs doméstiques", because unlike metal, wood does not react to changes in temperature. This is also one of the reasons why wall regulators from manufacturers in Vienna were fitted with such pendulums.

Jean-Aimé Jacob (1793 - 1871)
Jean-Aimé Jacob was born on November 28, 1793 in Sisteron, Basse-Alpes. He trained as a clockmaker in Paris; he began working with Pierre Louis Berthoud in April 1813, but when Berthoud died in September, his widow Claire Thérèse Berthoud asked clockmaker Jean François Henri Motel to continue her late husband’s business. Jean-Aimé Jacob and Jacques Fesche apprenticed with Motel until 1816. Due to the intervention of Abraham-Louis Breguet, Jacob was able to perfect his skills in Breguet’s workshop from April 1816 on.
Around 1840 Jacob opened a workshop in Saint-Nicolas d'Aliermont . At the time Saint-Nicolas d'Aliermont and the villages nearby already had an excellent reputation in the watchmaking world and were famous for the many travel clocks that were produced in the area. Jean-Aimé Jacob was considered to be one of the best-trained makers in the region and was especially famous for his chronometers, chronographs and regulators - his chronographs were fitted with a stop-seconds device he had invented himself. Between 1832 and 1867 Jacob won gold and silver medals as well as awards for his clocks and chronometers at a number of exhibitions in Paris; in 1856 he was one of the judges at the regional exhibition in Rouen. On November 19, 1859 he was made a Knight of the Legion of Honour. Jacob died on January 30, 1871 in Dieppe.
Source:,_Jean-Aim%C3%A9/de, as of 03/26/2014

Jean-Aimé Jacob, who called himself a pupil of Berthoud and Breguet, was famous for his clocks with a one year power reserve - a mechanism that was hardly ever implemented before the last quarter of the 19th century; it began to be commonly used only after the torsion pendulum had been invented. Clockmakers started making regulators to set their own timekeepers and for use in important and wealthy houses around the mid 18th century; until then these regulators were mainly built for use in observatories. The so-called "domestic" regulators usually had wooden rods and heavy brass bobs, because the wood rod did not react to changes in temperature. Other compensation devices could then be used, which was much more cost effective than the production of a compensated metal pendulum. Most manufacturers in Vienna used the wood rods in their wall regulators for that reason.
Estimate  30,000 - 40,000 €
This is a lot of a former auction!

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