History of Clocks

By: Matthias and Brandon

Sundial

Measures time by the sun by casting a shadow onto a cylindrical stone

Can measure local solar time

Used in ancient times around 1500 B.C.

Egyptian and Babylonian astronomy

Water Clocks

Greek, Romans

Babylon,Egypt,2000 B.C.

Oldest time measuring instrument

Counts days with tally sticks

Uses vertical gnomon

Bowl shaped outflow

Astronomical Clock

China, Su song, 1088

Richard of wallingford

Large astrolabe type dial

Shows moons age, phase,node (for indicating eclipses), star map, possibly major planets

Analog clocks

French Revolution

Indicates time using angles

24 hour analog dial

Scale of 12 hours

Atomic Clock

Made by:US National Bureau of Standards,USA

Invented in:1949

Uses an electronic transition frequency in the microwave optical

Based on atomic physics and using microwave electrons in atoms emit when they change energy levels

Cuckoo clock

Phillip Hainhofer

(1578-1647)

Black Forest, Augsburg

Mechanical organ with several automated figures

The bird automatically opens its beak and moves both its wings and tail