Dom Jacques Alexandre (24 January 1653 at

Orléans Orléans (;"Orleans"
(US) and Benedictine , image = Medalla San Benito.PNG , caption = Design on the obverse side of the Saint Benedict Medal , abbreviation = OSB , formation = , motto = (English: 'Pray and Work') , foun ...

monk of the

Congregation of St. Maur The Congregation of St. Maur, often known as the Maurists, were a congregation of French Benedictines, established in 1621, and known for their high level of scholarship. The congregation and its members were named after Saint Maurus (died 565), a ...

. He made his profession in the

abbey An abbey is a type of monastery used by members of a religious order under the governance of an abbot or abbess. Abbeys provide a complex of buildings and land for religious activities, work, and housing of Christian monks and nuns. The conce ...

of Vendôme, 26 August 1673, and after completing his philosophical and theological studies, was sent to the

monastery A monastery is a building or complex of buildings comprising the domestic quarters and workplaces of monastics, monks or nuns, whether living in communities or alone (hermits). A monastery generally includes a place reserved for prayer which ...

of Bonne-Nouvelle, where he spent the remainder of his life.

Biography

He died as sub-prior of the monastery. Though somewhat delicate in health, he was a man of great industry and all his leisure was devoted to the study of mathematics and physical and mechanical science. He wrote much, though apparently without thought of publication, for most of his writings were merely transcribed into a large folio volume which was preserved in the library of Bonne-Nouvelle. Alexandre is known chiefly by his two works, ''Traité du flux et du reflux de la mer'' and the ''Traité général des horloges''. The former had already been written when the

Academy of Bordeaux In France, various types of institution have the term "University" in their name. These include the public universities, which are the autonomous institutions that are distinguished as being state institutes of higher education and research that p ...

proposed the cause of the tides as the subject of a prize essay. He submitted an extract which was deemed worthy of the prize and his success led him to publish the entire work at Paris, 1726. This treatise, based as it is upon the supposed rotation of the earth about the moon, is of interest only from an historical point of view, as a contribution to the solution of a problem which has engaged the attention of the most skilful analysts since the time of Newton. The "Traité général des horloges", Paris, 1734, as its name indicates, is a general treatise on the history and the art of constructing time-pieces. It contains a catalogue of writers on the subject with a brief account of their principal works. Besides his manuscript works on subjects in mathematics, mechanics, etc., Alexandre added a sixth part to

Huygens Huygens (also Huijgens, Huigens, Huijgen/Huygen, or Huigen) is a Dutch patronymic surname, meaning "son of Hugo". Most references to "Huygens" are to the polymath Christiaan Huygens. Notable people with the surname include: * Jan Huygen (1563– ...

' treatise "De horologio oscillatorio", in which he describes a clock the length of whose pendulum was automatically varied to enable it to indicate apparent solar instead of mean solar time. A description of the pendulum mechanism, which never came into practical use, may be found in Berthoud's "Essai sur l'horlogerie", Paris, 1786, I, xvii, where some of its defects are pointed out.

References

{{DEFAULTSORT:Alexandre, Dom Jacques 1653 births 1734 deaths French Benedictines