In weight-driven clocks, the chain can be a continuous loop which runs around three sprockets.

The weight-driven clock "needs some attention, cleaning and oiling," to be returned to working order, he said.

These early spring-driven clocks were much less accurate than weight-driven clocks.

Nocturnals, for telling the time using the stars, and quadrants preceded the invention of the first weight-driven clock in the late 13th century.

A grandfather clock, also known as a longcase clock, is a type of freestanding, weight-driven clock, usually six to eight feet in height.

When you "wind" a weight-driven clock, you pull on a cord that lifts the weight.

In a spring-driven clock you wind the spring and it unwinds into the same sort of gear train found on a weight-driven clock.

A European innovation, these weight-driven clocks were used primarily in clock towers.

Other inventions had a greater impact on everyday life, such as eyeglasses and the weight-driven clock.

The tower was extended 20 feet in 1901 to increase the drop required by the weight-driven clocks, this increased its height to 84 feet.