What is a Clock and Watches?

Clocks and Watches, devices used to measure or indicate the passage of time. A clock, which is larger than a watch, is usually intended to be kept in one place; a watch is designed to be carried or worn. Both types of timepieces require a source of power and a means of transmitting and controlling it, as well as indicators to register the lapse of time units.there are many different kinds of clock like the following

Weight-Driven Clock
Most grandfather clocks are weight-driven, which means they are powered by the pull of a hanging weight. A mechanism called the escapement regulates the incremental release of the weight’s energy via toothed gears, which set other wheels in motion. As the pendulum swings back and forth, the escapement “walks” along the escape gear, the clock ticks, and the weight moves gradually downward, until it eventually needs to be reset. In other clocks, a wound spring serves the purpose of the weight.

Sandglass
Ornate sandglasses like this one were once used to mark the passage of minutes and hours. Flipping the glass causes the fixed amount of sand to pass though its narrow central hole in a consistent length of time, creating a relatively accurate measure. Generally called hourglasses because an hour was their standard setting, almost any period of time could be set by altering the amount of sand or the size of the central opening

Pocket Sundial
This portable folding German sundial has a string gnomon (pointer), adjustable for accuracy at any latitude. As shadows fall across the sundial, the smaller dials show Italian and Babylonian hours. The dial also indicates the length of the day and the position of the sun in the zodiac.

Pocket Watch
This engraving depicts a Nüremberg egg, a pocket watch designed by Peter Henlein in the early 16th century. Small, portable clocks like the Nüremberg egg became possible with the development of coiled springs as a power source for timekeeping devices

Liquid Crystal Display
Liquid crystal forms from various organic substances and takes its name from the crystal-like properties of liquids whose molecular orientation changes when a small electric current is applied. Sensitive to temperature and pressure, liquid crystal can appear as a solid at low temperatures and high pressures or as a liquid at high temperatures and low pressures. Liquid crystal is used to make clock displays, television receivers, and notebook computer screens.

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