A watch is a small clock,
typically worn either on the wrist or attached on a chain and carried
in a pocket; wristwatches, however, are the most common type of watch
used today. Watches evolved in the 17th century from spring powered
clocks, which appeared in the 15th century. The first watches were
strictly mechanical. As technology progressed, the mechanisms used to
measure time have, in some cases, been replaced by use of quartz vibration or electronic pulses.The first digital electronic watch was developed in 1970.
