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Second Quarter Project

Clocks
by

Hana Ji

on 8 January 2014

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Transcript of Second Quarter Project

History
Clocks
Sharon Chan
Robyn Du
Hana Ji

Sundials
Water Clocks
First calendars
Early Civilizations
History
1200-1920
Mechanical clocks
pendulums
weights
balance wheels
History
1920-present
quartz clocks
atomic clocks
Structure
Structure
Structure
Operation
Operation
Future
Future
Future
Energy Source
Mainspring
Escapement
Prevents the potential energy stored in the power supplies to be used up immediately - releases it in regular intervals



Gear train
Pendulum

Drive Train
Operation
hands of a clock
Swings in regular periods, increasing the accuracy of the clock
Thanks for listening!
How clocks are wound
mainspring drives train

escapement rotates wheels
Atmos Clock
high ratio gear trains decreases times clocks need to be rewound
Optical atomic clocks
changes accordingly to length of pendulum
Better materials
Simplification

wind coil to create spring potential energy
Weights
wind cord to suspend weight
Full transcript