08-10-2009, 04:54 PM #1
August. Tuning Fork Clock. Louis-Clément Breguet
Nickel-plated metal, brass, steel
Height: 46 cm. Width: 26 cm. Depth: 19 cm.
Dial signed: BREGUET N° 1150 BREVETE SGDG
Case signed: BREGUET
Initials PK at base of diapason.
Finished in 1868
The nickel-plated metal case has glass on all four sides.
The annular dial is engraved with Roman numerals for the hours and Arabic numerals for the five minutes, with a small eccentric seconds dial in the upper part.
The clock movement was built on the principles set down in patent n° 73414 registered on 20 October 1866 by Louis-Clément Breguet. It has two barrels, a train and an escapement. The regulating organ is a steel tuning-fork, two hundred and fifty millimetres in length and vibrating at one hundred hertz. One of its arms touches the escapement, whose function is to keep it vibrating.
Finished in 1868.
1997, MIH, p. 33, illus.
Comptes Rendus de l’Académie des Sciences, volume LXIII, 1866, p. 991.
George Sire, Rapport sur l’horlogerie à l’Exposition Universelle de 1867, Paris, s.d.
Frédéric Marle, "La pendule à diapason de Louis Breguet", Annuaire de la montre suisse, 1964, 1965.
MIH, 1974, p. 131, illus.
Breguet, 1997, p. 335, illus.
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