![]() ![]() It can also cause the points of the escape wheel teeth to dig into the pallet surface. It results in a temporary reversal of the entire wheel train back to the driving weight with each tick of the clock, causing extra wear in the wheel train, excessive wear to the gear teeth, and inaccuracy. The backward motion of the escape wheel during part of the cycle, called recoil, is one of the disadvantages of the anchor escapement. The pendulum must be given a swing to get them going. Neither the anchor escapement nor the deadbeat form, below, are self-starting. Then the tooth slides off the end of the pallet, beginning the cycle again. The momentum of the pendulum continues to move the second pallet toward the wheel, pushing the escape wheel backward for a distance, until the pendulum reverses direction and the pallet begins to move away from the wheel, with the tooth sliding along its surface, pushing it. The central shaft of the anchor is attached to a fork pushed by the pendulum, so the anchor swings back and forth, with the pallets alternately catching and releasing an escape wheel tooth on each side.Įach time one pallet moves away from the escape wheel, releasing a tooth, the wheel turns and a tooth on the other side catches on the other pallet, which is moving toward the wheel. On the two arms of the anchor are curved faces which the teeth of the escape wheel push against, called pallets. The anchor escapement consists of two parts: the escape wheel, which is a vertical wheel with pointed teeth on it rather like saw teeth, and the anchor, shaped vaguely like a ship's anchor, which swings back and forth on a pivot just above the escape wheel. This gradually superseded the ordinary anchor escapement and is used in most modern pendulum clocks. The anchor became the standard escapement used in almost all pendulum clocks.Ī more accurate variation without recoil called the deadbeat escapement was invented by Richard Towneley around 1675 and introduced by British clockmaker George Graham around 1715. The oldest known anchor clock is Wadham College Clock, a tower clock built at Wadham College, Oxford, in 1670, probably by clockmaker Joseph Knibb. When Clement's clock appeared Hooke claimed the invention of the escapement, saying that he had shown a clock with the same escapement to the Royal Society soon after the great fire of 1666. The anchor escapement was probably invented by British scientist Robert Hooke around 1657, although some references credit clockmaker William Clement, who popularized the anchor in his invention of the longcase or grandfather clock around 1680. The anchor escapement was so named because one of its principal parts is shaped vaguely like a ship's anchor. ![]() The escapement is a mechanism in a mechanical clock that maintains the swing of the pendulum by giving it a small push each swing, and allows the clock's wheels to advance a fixed amount with each swing, moving the clock's hands forward. In horology, the anchor escapement is a type of escapement used in pendulum clocks. The plate that normally holds the front end of the pinions has been removed for clarity. The anchor and escape wheel of a late 19th-century clock. ![]()
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