Sheraton Mantel Clock with Marquetry Inlay
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- 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. - Thomas Sheraton - Thomas Sheraton (1751-1806) was born in Stockton on Tees in the north of England. He was apprenticed to a local cabinetmaker and after working as a cabinetmaker, Sheraton moved to London about 1790. Although he described himself as a cabinet-maker, like Chippendale, no definite piece of furniture can be traced to him as maker. Nevertheless, he was immensely influential and in 1791-4 published his four volume book 'The Cabinet-Maker and Upholsterer's Drawing Book'. The books were used as source of design by the furniture-making trade , who often simplified or modified the designs to suit their own preferences. Sheraton furniture is marked by restraint and sophistication, elegance and discretion, though he also found time to invent fanciful combination furniture.
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