Mitch Price, age 9, of Salt Lake City, Utah, for his question.

WHEN WAS THE FIRST DIGITAL WATCH MADE?

A locksmith from Germany named Peter Henlein is sa d to have invented the first watch in about 1500. It was so heavy that it had to hang from a belt around the waist.

Hundreds of years later, an electric watch was introduced in the United States in1957 by Hamilton. In the electric watch, an energy cell, orbattery,provided the power to run the watch. The energy cell supplies electric power to a coil mounted on the balance wheel. Asthe coil passes through the magnetic field of two permanent magnets, an impulse from the balance wheel sends powerto the train.

In the 1970s the digital watch was introduced and became popular. Here power from a battery activates a quartz crystal. Electronic circuits translate vibrations from the crystal into hours, minutes and seconds. The information is then displayed by means of numbers that light up on the blank face of the watch