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Pendulum Clock By: Junho, Dh
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What is this invention -Pendulum Clock -Pendulum -16 th century
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History 1582 – Galileo fixed period 1656- Dutch Scientist Christian Huygens 1880s- The grandfather clock 1921- Designs improve
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Purpose Save time Keep promise/meeting Accurate time
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How it works? Swing back and forth Time base – gears Small gear rotate Each gear, face of the clock
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How simple machine… Controlled force Self working
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One World Sociable Keep Meetings and promises Friend ship
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Advantages Sociable Keep time well Accurate time
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Disadvantage Need battery/ resource When time is not set
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Bibliography -History of the pendulum clock." Grandfather clocks info: Facts about long case clocks. grandfather clocks guide, n.d. Web. 20 Apr. 2011. http://www.grandfather-clocks-guide.info/history-of-the-pendulumqs- clock.html. http://www.grandfather-clocks-guide.info/history-of-the-pendulumqs- clock.html -Huygen’s principle. Cambridge Physics Huygen’s principle. http://www- outreach.phy.cam.ac.uk/camphy/xraydiffraction/xraydiffraction4_1.htm. April 19 th.http://www- outreach.phy.cam.ac.uk/camphy/xraydiffraction/xraydiffraction4_1.htm -Katzenback, Jason. Are you Blogging with Purpose? (If not 5 ways to fix it). Copyblogger Are you blogging with purpose? (If not, 5 ways to fix it) http://www.copyblogger.com/purposeful-blogging/. April 19, 2011 http://www.copyblogger.com/purposeful-blogging/ - Lilley,Stephen. How a clocks work. Ehow How a clocks work -Pendulum Clock. Wikipedia Pendulum Clock http://en.wikipedia.org/wiki/Pendulum_clock\ -Simple machine. Science Learning simple machine. http://www.fi.edu/qa97/spotlight3/spotlight3.html. April 19, 2011 http://www.fi.edu/qa97/spotlight3/spotlight3.html -U+2212 MINUS SIGN. Decodeunicode U+2212 MINUS SIGN. http://www.decodeunicode.org/u+2212. April 19, 2011 http://www.decodeunicode.org/u+2212
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THANK YOU
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