Gilt brass mantel clock with deadbeat escapement and thermometer

• Hunt & Roskell - Hunt & Roskell, were a firm of manufacturing and retail jewellers and silversmiths, founded in 1843 by Robert Roskell a famous pocket watch maker from Liverpool, and John Samuel Hunt who had previously been in partnership with silversmith Paul Storr, trading Storr & Co. (1819-22), Storr & Mortimer (1822-38), Mortimer & Hunt (1838-43) and then Hunt & Roskell (1843-97).
  
  Hunt & Roskell had retail premises at 156 New Bond Street and a manufacturing workshops at 26 Harrison Street, near Clerkenwell.
  
  They were among the finest of the Victorian silversmith, manufacturing in the high Victorian style, and their craftsmanship was recognised by their appointment as silversmiths and jewellers to Queen Victoria.
  
  John Samuel Hunt continued as a partner until his death in 1865, when he was succeeded by his son, John Hunt (d.1879). Robert Roskell remained in the firm until his death in 1888. In 1889 the firm was taken over by J.W. Benson and continued in business as Hunt & Roskell Ltd until c.1965.
• Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
• 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.
• 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.

This item has been included into following indexes:

• Hunt & Roskell / Robert Roskell (London) - clocks, maker or retailer 3