Elements used in watches

The mechanical clock consists of a complicated series of wheels, gears, and levers powered by a falling weights and with a pendulum. These critical pieces move together. The hands on a dial to show the time. The addition of bells on the hour, half hour, and quarter hour followed soon afterward. By the eighteenth century, smaller clocks for the home were available, and, unlike their predecessors, were closed and sealed in a case.  

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