George III 18ct Gold Fusee Watch, Bayly & Upjohn, 1791
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___5EECF8CA-D7C8-2130-CADD91CD77BE78Af___ 18ct yellow gold fusee watch the movement is marked Bayly & Upjohn 24087, and IR (James Richard) London 1791, 18, to inside case and outer case. Approx outer case weight 28 grams, watch weight 86 grams. A/f to face, Fusee verge escapement movement does not run. Provenance: The Logan estate.
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- Verge Escapement - A verge escapement is an early mechanical escapement used in clocks and other timekeeping devices. It is an early form of the escapement mechanism, which is used to regulate the movement of the hands of a clock or watch. The verge escapement consists of a vertical shaft called the verge, which is mounted on the clock's main plate. Attached to the verge are two pallets, which engage with the teeth of the escape wheel. As the escape wheel turns, the pallets alternately lock and release it, allowing the movement of the clock to be regulated. The verge escapement was widely used in early mechanical clocks, but it was eventually replaced by the more accurate and reliable anchor escapement.
- A/f, as Inspected - The letters "A/F" or "as inspected" as part of a description is the cataloguer's shorthand for "all faults" or "as found", meaning the item has some type of damage or deficiency, it is of uncertain date or provenance, and/or that the seller takes no responsibility for the completeness of the item or the accuracy of the description.
- George Iii - George III (1738 - 1820) was King of Great Britain and Ireland from 1760 to 1820.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Fusee - The fusee movement was used in clocks and pocket watches from the mid 17th century. The fusee is a cone shaped drum within the works that is linked to the barrel of the spring, usually by a length of chain.
As the mainspring loses its tension over time, the cone shaped barrel compensates for this by increasing the tension, by pulling the mainspring tighter, thus ensuring the time remains constant.
Use of the fusee in clocks was superseded by the "going barrel" in the mid 19th century and for pocket watches at the beginning of the 19th century.
The fusee continued to be used in marine chronometers until the 1970s.
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