Evolution of the clock

1. By: Bri Frys and Rachael Swenson Evolution of the Clock

2. The First Clock The first recorded clock was invented in 1300 BC by the Egyptians, they used a sundial, which works by the sun casting a shadow on a triangular pointer (much like the hour hand on our modern clocks). The dial is numbered all the way around to account for the hours, the number the shadow falls on, is what time it is.

3. Clocks that Followed… 1370, France used church bells to clock time. In 1400 BC, the Greeks used a water clock that measured time by how much water was released. Around 1400 BC, the first mechanical clock in Europe, a mainspring and a balance wheel clock, was being invented. 1510, the watch making industry blossoms. 1730, the first cuckoo clock is invented. 1759, England builds a clock that only loses five seconds on a voyage from England to Jamaica.

4. Clocks that Followed…(cont.) 1840, in the USA, a time ball at the Naval Observatory is dropped at noon for the ships to set their clocks. 1886, R.W Sears Watch Company (now known as Sears and Roebuck and Company) started selling affordable wrist watches in America. 1945, Isador Rabi makes a clock based on the study of atoms, using a method called the atomic-beam magnetic resonance. 1949, NIST (National Institute of Standards and Technology) built the first atomic clock, using ammonia. 1968, the first electric digital clock was invented by Peter Petrov .

5. Product Lifestyle Most people would find that it is cheaper to replace the watch in their battery rather than buy a new watch. Jewelry stores or other stores or organizations, promote recycling your old watch and its battery.

6. Bibliography Timeline. ( n.d .). Time For Time . Retrieved September 7, 2010, from www.time-for-time.com/timeline.html Endick , M. ( n.d .). Recycling Old Watch Batteries Helps The Environment. ArticleSnatch.com . Retrieved September 7, 2010, from www.articlesnatch.com/Article/Recycling-Old-Watch-Batteries-Helps-The-Environment/399423 Learn How Sundials Work. ( n.d .). Liverpool museums - National Museums Liverpool . Retrieved September 7, 2010, from http://www.liverpoolmuseums.org .