Clock Information Guide
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Man has kept track of time since the dawn of history. Early man
used the rising and setting of the sun to determine each day's
activities. He used the phases of the moon and the changing
seasons to group the days into months and years. As time went
on, methods were devised to divide the days and nights into hours,
and to divide the hours into minutes and seconds.
Early clocks kept time by measuring shadows, but these clocks only worked on sunny days. Ancient civilizations developed simple water clocks that kept time by marking water levels in constantly-dripping containers, and more accurate sand clocks, or hourglasses, were invented during the Middle Ages. During this era, mechanical clocks were also developed; they used mechanisms involving weights, springs, and even pendulums to keep time quite accurately. Today, mechanical and electronic clocks and watches are used to precisely track the passage of hours, minutes, and seconds; and calendars are used to track the passage of days, months, and years.
Wall clocks are useful because they can be viewed by multiple
people at the same time. Just about every classroom has a wall
clock. When placed above other furniture, these clocks take little
space, which is especially helpful when work top space is at a
premium. Wall clocks may be designed to keep time with mechanical
gears, digital electronics, or a quartz crystal. They may even
adjust their time periodically with atomic clock technology. A pendulum and weights, electric
current, or batteries may keep these clocks running. The homeowner
might choose a simple wall clock design or hang up a decorative
cuckoo clock to tell the
time. These elaborately carved wooden clocks uniquely tell the hour
via the cuckoo bird's call, and sometimes even add music to entertain.
A grandfather clock not
only strikes the time, but also serves as a piece of furniture. It
may have a selection of chimes to choose from, and often shows the phases
of the moon. Most grandfather clocks operate via a pendulum and
weight system. The weights on grandfather clocks must be adjusted
about once a week in order to keep these tall, floor clocks running.
Perhaps the most frequently used clock is the alarm clock. It is set to faithfully awaken its owner or alert its owner to an appointment. Traditional alarm clocks use mechanical gears and a spring that must be wound each day. Many modern alarm clocks are electric or even use digital electronic timekeeping methods. While going through the day's activities, yet another timekeeping device — the watch — keeps us on schedule. Specialized wristwatches are used to track time for sporting events or sports activities.
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