Abraham-Louis Perrelet

Abraham -Louis Perrelet ( born January 9, 1729 Neuchâtel, † 1826 ) was a Swiss clockmaker and inventor. He is parallel to Hubert Sarton as the inventor of the automatic winding for pocket watches with rotor and changer.

Life and work

Abraham -Louis Perrelet created the son of a farmer and carpenter at an early age technical components for watchmakers in the area around Le Locle. After his training as a watchmaker, he worked on improving the accuracy of clocks and pocket watches built in its diverse inhibitions as anchor escapement and duplex escapement. Complications he used, among other monthly calendar and the representation of the equation of time.

On June 8, 1777 physicist and naturalist Horace - Bénédict de Saussure wrote in his diary that he had met a gentleman Perlet, which builds watches that are absorbed by the movement of the wearer. On June 11, 1777 de Saussure reported to the General Assembly of the Société des Arts de Genève of this invention. The automatic winding of the Liege watchmaker Hubert Sarton was informed on December 23, 1778 the Paris Academy of Sciences.

In addition, he is considered the inventor of the Wälzmaschine for reworking the gear teeth and the planter to adjust the bearing plate between work and bridge or cock. 1780 brought the first Perrelet pedometer to completion.

Perrelet built his last pocket at the advanced age of 95 years. His grandson, Louis -Frédéric Perrelet, 1823 French court watchmaker.