History
Century
- XV
- XVI
- XVII
-
XVIII
- Abraham Louis Perrelet
- Abraham-Louis Breguet
- Antide Janvier
- Edward John Dent
- Ferdinand Berthoud
- Frédéric Japy
- Frédéric Louis Favre-Bulle
- Henri Louis Jaquet-Droz
- J. Louis Benjamin Audemars
- Jacques Frédéric Houriet
- James Cox
- Jean André Lepaute
- Jean Antoine Lépine
- Jean François Bautte
- Jean Frédéric Leschot
- Jean Moïse Pouzait
- Jean-Baptiste Schwilgué
- John Arnold
- John Ellicot
- Joseph-Thaddeus Winnerl
- Josiah Emery
- Louis Antoine Breguet
- Louis Moinet
- Louis-Frédéric Perrelet
- Pierre Augustin Caron dit Beaumarchais
- Pierre Frédéric Ingold
- Pierre Jaquet-Droz
- Pierre Le Roy
- Pierre-Louis Berthoud
- Robert Robin
- Thomas Earnshaw
- Thomas Mudge
- Urban Jürgensen
- William James Frodsham
-
XIX
- Aaron L. Dennison
- Achille Brocot
- Antoine Le Coultre
- Antoine Léchaud
- Auguste Lucien Vérité
- Charles Fasoldt
- Charles Frodsham
- Charles-Edouard Guillaume
- Constant Girard
- Edmond Jaeger
- Edouard Koehn Sr
- Edward Howard
- Ferdinand Adolph Lange
- Georges Frédéric Roskopf
- Georges-Auguste Leschot
- Hans Wilsdorf
- Henri Grandjean
- Henri Lepaute
- Henri Robert Ekegren
- Jean Celamis Lutz
- Jean Eugène Robert-Houdin
- Jean-Adrien Philippe
- John Harwood
- Jules Jürgensen
- Julien-Hilaire Rodanet
- Karl Moritz Grossmann
- Louis Leroy
- Louis Richard
- Louis-Clément Breguet
- Lyman W. Tompson
- Nicolas Mathieu Rieussec
- Sylvain Mairet
- Ulysse Nardin
- Victor Kullberg
Georges Graham
1673-1751
English clockmaker and astronomer.
Member of the Clockmaker Company (CC.).
Free CC.1695.
Master CC.1722.
Member of the Royal Society in London (admitted in 1721) and member of its Council (admitted in 1722).
Employee (from 1695), partner (Circa 1711) then successor of Thomas Tompion.
Married a niece of Thomas Tompion in 1696.
Thomas Mudge was one of his disciples.
1715
Invented the Graham escapement (deadbeat anchor escapement for pendulums).
1725
Improvement of Thomas Tompion's cylinder escapement for watches. It was the first cylinder escapement in history. Finalised in 1722, it was fitted on all Graham watches after 1726. The Frenchman, Julien Le Roy, who received one in 1728, recognised the superiority of the system.
1726
Invention of the Graham clock (mercury clock) which reduced the effects of temperature variations. Combined with the Graham escapement, this clock produced a degree of precision that was only to be exceeded with the development of the invar by Charles Edouard Guillaume in 1895. Clocks of this type were known as regulators.
Astronomy
George Graham is known for having produced several astronomic instruments. He was also a generous man: in particular he gave financial support to John Harrison who, like him, worked to determine longitude using a precision watch onboard ships.
Research
Research
For research into the first Rieussec chronographs, the Fondation de la Haute Horlogerie wishes to locate this piece, made between 1820 and 1830.