Isaac Rogers English Lantern Clock, 1760

• 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.
• Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
• 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.
• Finial - An architectural decoration, found on the upper parts of of an object. On furniture they are usually found on pediments, canopies and shelf supports. On smaller ceramic or silver items, such as spoons, they may decorate the top of the item itself, or the lid or cover where they provide a useful handle for removal.
  
  Finials have a variety of shapes and forms. They may be urn-shaped, baluster shaped round or spiral, but usually taper into an upper point. Many real life shapes may also be used as finials, such as pineapples, berries, pinecones, buds, lotus and acorns. Sometimes animals such as a lion are depicted, or fish and dolphins.
• Boss - A boss is small round or oval decorative device, used as ornament in Neo-classical style furniture, ceramics, sculpture and other decorative arts. They are usually applied to the surface in the form of stylized rosettes, but in the best pieces they are carved directly into the surface. Also known as paterae (or patera) or rosettes.
• Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
• Hour Striking / Half Hour Striking - An hour striking clock chimes on the hour to indicate the time. The striking mechanism consists of a series of gears and hammers that are set in motion by the clock's movement and are designed to strike a bell or gong to mark the passing of time.
  
  An hour striking clock will strike once on the first hour, twice on the second hour, and so on, up to twelve strikes at noon and midnight. In a half hour striking clock, the clock will strike once on the half hour, and the number of strikes on the hour corresponds to the number of hours passed since the previous half hour.

This item has been included into following indexes:

• clocks, type - lantern 37