The History TimeLine of Telling Time

Subject: The History TimeLine of Telling Time Mon Nov 17, 2008 8:55 pm

The History TimeLine of Telling Time

3,500 BC	1,500 BC	600BC	325 BC
Egyptians build obelisks and place	Egyptians build Sundials, which	Egyptians improve sundials with	The Greeks begin using a Clepsydras
them in strategic locations to cast	allow people to tell time by	a Merkhet, an astronomical tool	to measure hours using the gradual
shadows from the sun	measuring shadows	that measured nighttime hours	flow of water, which allows time to be measured at night

1335	1927	1955	1969
First firm evidence of a	Warren Marrison develops the	The world's first	The first electronic quartz wristwatches
Mechanical clock in Milan. Some	first Quartz Clock, which took	celsium atomic clock is built at	are sold to the public
suggest mechanical clocks existed before 1300	up the better part of a small room	Englands National Physical Laboratory	at a cost of $1,250 each