History World
History of Clocks
First watches were round metal objects that were worn around
the neck. These were originally made in Nuremburg from 1500 onwards and were
inspired from similar spheres which were used as pomanders to hold herbs and
protect against disease.
Galileo observed the swing of a lamp and later proved that a
suspended object takes the same amount of time to swing back and forth even if
it is larger or smaller. In 1656 Christian Huygens creates a model of a clock
based on this principle and in 1657 a full-scale clock is made.
In 1675 Huygens creates a spiral balance (aka hairspring)
which is a fine spring that is coiled flat and controls the speed of the
oscillation of the balance wheel. This made a watch more accurate and slim. Thomas
Tompion later applied the hairspring to pocket watches, this then led to the
development of the clock face and the addition of the minute hand. There were
various alterations to the arrangement of the clock face before the iconic
design was created.
The Chronometer was developed between 1714 and 1766 and was
used by naval and merchant ships during ocean travel. Originally the stars
could be used to understand latitude, but due to the turning planet you needed
to know the time of day in order to work out the longitude. Conditions at sea
made it hard to accurately tell the time, which in turn made it impossible to
know the exact position of a ship at sea. John Harrison developed various
versions which used bearings to reduce friction, weighted balances connected by
coiled springs to minimise the effects of movement and the use of two metals in
the balance spring to cope with the expansion and contraction caused by the
changes in temperature. In combination with the sextant this allowed explorers
to record accurate information.
In 1746 a millennium clock was created which would reveal
the date of the month up to the year 9999. It was made up of wheels and cogs
that turned at different speeds which would tie in with the Julian calendar.
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