A Queen Anne bracket clock by Thomas Martin, London (1675-1716),…
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A Queen Anne bracket clock by Thomas Martin, London (1675-1716), the ebonised domed case with gilt metal mounts, the silvered chapter ring with Roman numerals and Arabic minutes, signed 'Tho. Martin London', with gilt cherub head spandrels and matted centre, double fusee verge escapement striking on a bell. Height 40 cm, width 25 cm, depth 17 cm. Provenance: collection of C Gordon Russell, London, 1951, the Estate of the Hon. Dr John Kennedy McLaughlin Am, Sydney
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- Spandrel - An architectural term that in horology refers to the triangular ornamental decoration in the corners of of the dial plate. The spandrels are usually of cast brass and may be additonally chased and engraved. On painted dial clocks the spandrels are also usually painted.
- 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.
- 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Use of the fusee in clocks was superseded by the "going barrel" in the mid 19th century and for pocket watches at the beginning of the 19th century.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. - Matted - For decorative purposes the centre exposed brass area of a dial clock was often matted. this practice, dating from the second half of the 17th century was produced by hammering the brass with a single or multi-pointed punch, by rolling the brass or by etching the brass with acid.
The process creates a fine granulated surface in which the light is refracted in different directions and so was more pleasing to the eye than the flat brass surface. - Chapter Ring - A separate metal plate on the face of a clock, on which the numerals for the hours and sometimes parts of the hours, are displayed, usually wheel shaped and sitting on top of the dial plate. The chapter ring is often a feature of the clock and can be silvered or enamelled to stand as a contrast to its background. The hours are usually shown in Roman numerals, although in the late 19th and earlt 20th century, Arabic numerals became fashionable.
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