dipity

This timeline is about how people kept time back in the old days

Created by suriv8 on Sep 15, 2008

Last updated: 03/11/10 at 08:02 PM

• Atomic Clocks: NIST-7 (1993)
  2013

  NIST-7 was the primary atomic time standard for the United states since 1993 but replaced by the NIST F-1. IT was among the best time standards in the would. More accurate (1993)
  http://www.beaglesoft.com/maintimehistory.htm

• The Black Watch (1975)
  2012

  The watch would be ruined by static form nylon shirt, nylon carpet or an air conditioned room. Most of the watches would not work before it even left the factor. It would freeze on one very bright digit or it would cause the batteries to overload and sometimes it would explode. It was very temperature-sensitive. So it would run at different speed at different temperature. Ten day life-span. It had no hand in it
  http://www.beaglesoft.com/maintimehistory.htm

• Quartz clocks (1975)
  2011

  Quartz clocks were based on the electric property of the quartz crystal. When you bend or squeeze it an electric field is generated. If you put a electric circuit in the the crystal then it cause the crystals to vibrate. It makes a constant electric signal which can be used to tell time. The quartz clocks are good because it can tell the time and also it can tell you heart rate. It was portable (1975)
  http://www.beaglesoft.com/maintimehistory.htm

• Mechanical clock: More acccurate pendulum (1670)
  2010

  William Clement made a pendulum that took one second to swing. It was a yard long.He encased it so the air currents will not effect the swing. Then there was a need for a minute hand. (1670)
  http://www.beaglesoft.com/maintimehistory.htm

• Mechanical Clocks: Clocks that have pendulum (1583)
  2009

  Galileo noticed the swaying chandeliers in a cathedral. He timed the swaying with his pulse. Then began to experiment with swing weights. The pendulum is a way of marking small interval of time more accurately. (1583)
  http://www.beaglesoft.com/maintimehistory.htm

• Mechanical clocks: Spring-Powered Clock (around 1500-1510)
  2008

  The Spring-Powered Clock was a some clock that could fit in a shelf. With the clock made timekeeping more accurate. It was smaller because the other ones were like two by one yard big. (around 1500-1510
  http://www.beaglesoft.com/maintimehistory.htm

• Mechanical clocks (invented in Mediaval Europe)
  2007

  The mechanical clocks was an arrangements of gears and wheels that was turned by weights attached to them. Soon the clocks chimed the quarter-hour. The best clocks would have gained on or loss half an hour a day. It was more accurate
  http://www.beaglesoft.com/maintimehistory.htm

• Using Water: Elaborate Water Clocks (Between 100 B.C. and 500 A.D.)
  2006

  The same water clocks but it had some attachment on it like it rang a bell or showed little figures of people in the windows or had opened doors etc.... The bell was like an alarm. Between 100 B.C. and 500 A.D.
  http://www.beaglesoft.com/maintimehistory.htm

• Using The Sun: Hemicycle (Around 300 B.C.)
  2004

  The most accurate one was the hemicycle, it is a bowl shaped depression that was cut into a block of stone. It is has different sets of hour lines for the different seasons. It is like a type of fashion (Around 300 B.C.)
  http://www.beaglesoft.com/maintimehistory.htm

• Using the Stars: The Merkhet (Around 600 B.C.)
  2003

  The Egyptians uses a weight on the end of a string. Then they lined it so it was facing the Pole Star. They tell the night times when a star passes the merkht. It allows time to be told at night. (Around 600 B.C.)
  http://www.beaglesoft.com/maintimehistory.htm

• Using Water: Water Clocks (Around 1500 B.C.)
  2002

  The water clock or clepsdras (means "water clock" in Greek) dripped water regular through a narrow opening. When the water in the bowl rises there will be a float that carried a pointer that marked the hours. Another type of water clock is when the bowl has some water in it then it makes the bowl sinks. The water clocks be more accurate then the sundial. (Around 1500 B.C.)
  http://www.beaglesoft.com/maintimehistory.htm

• Using The Sun: The Sundial (Around 1500 B.C.)
  2002

  The Egyptians then moved to using the sundial. The sundial is divided into 10 parts with two twilight hours. In midday the sundial had to turn 180 degrees to measure the afternoon hours. The sundial allows time to be portable (Around 1500 B.C.)
  http://www.beaglesoft.com/maintimehistory.htm

• Using The Sun: Obelisks (Around 3500 B.C.)
  2001

  The Egyptians built obelisks and placed them in a area in which the sun can cast a shadow on it. The Egyptians marked the shadows. In the noon the shadow is the shortest and also you can find out the date in a year because the sun set late in the summer and it sets early in the winter. It is important to have time because you will become more organized and you will know what you did in you day. ( Around 3500 B.C.)
  http://www.beaglesoft.com/maintimehistory.htm