Time
Submitted
by HOST
GFS
LindaE@aol.com
When
were clock hands
invented?
The
first known mechanical clocks in
Europe were built in the
thirteenth century, but they did
not have a circular dial or
pointers to show the time. These
primitive timekeepers had bells
or other noisemakers that sounded
approximately once every
hour.
The
first clocks with pointers
(hands) were made in the
fourteenth century. Those early
dial clocks had only one hand,
the hour hand. The idea of
measuring time more accurately
than that was ridiculous in those
days, because the clocks were not
accurate enough to make it
worthwhile.
Although
Jost Burgi invented the first
clock with a minute hand in 1577,
it was not until the invention of
the pendulum-regulated clock in
1657 that a minute hand became
practical, and second hands were
not used until the eighteenth
century.
The
history of timekeeping:
http://physics.nist.gov/GenInt/Time/time.html
Who invented the pendulum
clock?
http://features.LearningKingdom.com/fact/archive/2000/05/19.html
What is the most accurate clock
in the world?
http://features.LearningKingdom.com/fact/archive/2000/02/02.html
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