A combination of a watch and a stopwatch.
A device which marks or records time or time intervals.
To make an accurate measurement of the speed of a projectile.
A watch's guard-ring by which it is attached to a chain.
Used to refer to the tendency of a situation to oscillate (between two extremes).
A lamp, etc. suspended from a ceiling.
A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.