Deniere Brothers Marble and Ormolu Mantel Clock

• Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
• Back Plate - On many types of clocks, the movement operates between two plates, usually made of brass, one at the back, and the other at the front, which forms a mount for the dial.
  
  On English bracket, mantle and table clocks the backplate was often visible through a glass door or panel from the late 17th century, and could be profusely engraved with scrolling decorations, flowers, foliage, birds, and figures. The engraving could also include the maker?s name.
  
  The amount of engraving reduced and became simpler as the 18th century progressed, and by 1800, had been reduced to a border, often with the maker's name in the centre. By the early 1800s all decoration had ceased, and only the maker's name was added, and by the Victorian era, most bracket, mantle and table clocks had no engraving.
• Pendulum - The pendulum was discovered around 1602 by Galileo Galilei, and was adopted for time keeping by the Dutch mathematician and natural philosopher, Christiaan Huygens, who excelled in astronomy, physics, and horology.
  
  The pendulum comprises a metal rod usually of brass or steel with a metal disk, known as a bob, at the end. The movement of the pendulum is driven by weights or a spring, and as a pendulum swings in a regular arc, it was found accuracy could be controlled to within a few seconds a week.
  
  Timekeeping can be adjusted by changing the height of the bob on the rod, making the pendulum either swing slower or faster.
  
  The disadvantage of the pendulum was that changes in temperature also changed the length of the pendulum, interfering with the accuracy of the clock, and so in the 18th century two types of mercurial pendulums were invented which countered the movement in the steel rod.
  
  The pendulum was the world's most accurate timekeeping technology until the invention of the quartz clock, regulated by a quartz crystal, in 1927.
• Floral Swag / Garland / Festoon - Floral swags are a decorative motif often used in the ornamentation of various objects, such as silverware, glassware, and furniture. The term "swag" refers to a garland or wreath of flowers, foliage, or other decorative elements, which is usually arranged in a loop or curve.
  
  Floral swags can be found in a variety of decorative styles, from ornate Baroque and Rococo designs to more naturalistic Art Nouveau and Art Deco styles. They are often used to add a touch of elegance, refinement, or whimsy to an object, and can be seen on a range of items from chandeliers and candlesticks to picture frames and tea sets.
  
  In the decoration of silver objects, floral swags are often used to accentuate the curves and lines of the piece, and to add visual interest to the surface. Similarly, on glass objects, floral swags may be used to frame or highlight a particular area of the object, or to add a touch of color and delicacy.
  
  On furniture, floral swags can be found on a variety of pieces, from cabinets and armoires to chairs and sofas. They are often used to enhance the lines and curves of the furniture, and can be used to create a sense of movement and flow in the design.
  
  Overall, floral swags are a versatile decorative element that can be adapted to a range of styles and applications, and have been used in the decoration of various objects throughout history.
• Ormolu - Ormolu was popular with French craftsmen in the 18th and 19th century for ornamental fittings for furniture, clocks and other decorative items. True ormolu is gilt bronze, that is bronze that has been coated with gold using a mercury amalgam. Due to the health risks associated with using mercury, this method of creating ormolu was discontinued in France in the 1830s. A substitute was developed consisting of about 75% copper and 25% zinc, however it was inferior to the bronze version. It was often lacquered to prevent it tarnishing.

This item has been included into following indexes:

• clocks, mantle & shelf, material or style - gilt metal / ormolu 547
• clocks, mantle & shelf, period or origin
  • French 761
  • Victorian 493