anchorescapement

An anchorscapement is a type of escapement mechanism used in mechanical watches and clocks. It was invented by the English clockmaker William Clement in 1670, building upon earlier designs by Robert Hooke. The primary function of an escapement is to regulate the release of energy from a spring or weight, allowing the gears to advance at a controlled rate, thus driving the timepiece's hands.

The anchorscapement is characterized by a lever, shaped like an anchor, which swings back and forth. This lever interacts with the escape wheel, a toothed wheel driven by the mainspring. The anchor has pallets, typically two, that alternately engage with the teeth of the escape wheel. As the anchor swings, one pallet catches a tooth, stopping the escape wheel, while the other pallet is disengaged. Then, as the anchor swings in the opposite direction, the first pallet releases the tooth, and the second pallet catches the next tooth. This intermittent motion prevents the escape wheel from spinning freely and controls the speed at which the rest of the gear train rotates. The swing of the anchor is usually powered by a pendulum or a balance wheel, which oscillates at a consistent frequency. The anchorscapement is a very common and widely used design due to its relative simplicity and accuracy compared to earlier escapements.