Bob (physics)

As a pendulum bob (also lens of the pendulum ) is called on pendulum clocks, several styles of lenticular pendulum body.

Description

Widespread Style Watches of this type are the Wiener Laterndluhr in the 19th century ( around 1900 ) and its cheaper replicas with wood pendant, the old German clocks, and in the 18th century, the French cantilever watches.

The flat lens shape on the one hand by its metallic luster a decorative element, on the other hand beneficial to the accuracy of the clock. Because of the air resistance of the swinging pendulum is relatively low, which is why the air pressure changes have little effect. For precision pendulum clocks of this type could provide the pendulum rod by suitable metal rods with temperature compensation and evacuate the housing part.

To regulate the Uhrgangs located under the pendulum bob a regulating nut. The oscillation amplitude can be determined at an angular scale and brought by small change in slope of the watch case in symmetry, which also improves the aisle.