Search the Kids Internet
Encyclopedia
> Timeline of time measurement technology
Article Content
Timeline of time measurement technology
Timeline
of
time
measurement
technology
270 BC
-
Ctesibius[?]
builds a popular
water clock[?]
46 BC
-
Julius Caesar
and
Sosigenes
develop a solar calendar with leap years
1502
-
Peter Henlein[?]
builds the first
pocketwatch[?]
1582
-
Pope Gregory XIII
,
Aloysius Lilius
, and
Christopher Clavius[?]
introduce a
Gregorian calendar
with an improved
leap year
system
1656
-
Christian Huygens
builds the first accurate
pendulum clock
1676
- Motion works and minute hand introduced by
Daniel Quare[?]
1680
- Second hand introduced
1737
-
John Harrison
presents the first stable nautical chronometer, thereby allowing for precise
longitude
determination while at sea
1928
-
Joseph Horton[?]
and
Warren Morrison[?]
build the first
quartz crystal oscillator clock[?]
1946
-
Felix Bloch
and
Edward Purcell[?]
develop
nuclear magnetic resonance
1949
-
Harold Lyons[?]
develops an
atomic clock
based on the quantum mechanical vibrations of the ammonia molecule
All Wikipedia text is available under the terms of the GNU Free Documentation License
Search Encyclopedia
Search over one million articles, find something about almost anything!
Featured Article
Fibre optic gyroscope
... Contents Fibre optic gyroscope wikipedia.org dumped 2003-03-17 with ...