The pendulum clock was invented in the 16th century and improved over time. It uses a swinging pendulum to keep accurate time and allow people to keep schedules and promises. The pendulum clock works through a system of gears controlled by the swinging pendulum to move the hands on the clock face. While it allows for organization, the pendulum clock requires resources to function and can lose time if not properly set.

1. Pendulum ClockBy: Junho, Dh

2. What is this inventionPendulum Clock

3. Pendulum

4. 16th centuryHistory1582 – Galileo fixed period 1656- Dutch Scientist Christian Huygens1880s- The grandfather clock1921- Designs improve

5. PurposeSave timeKeep promise/meetingAccurate time

6. How it works?Swing back and forthTime base – gearsSmall gear rotateEach gear, face of the clock

7. How simple machine…Controlled forceSelf working

8. One WorldSociable Keep Meetings and promisesFriend ship

9. AdvantagesSociableKeep time wellAccurate time

10. Disadvantage Need battery/ resourceWhen time is not set

11. BibliographyHistory 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.

12. Huygen’s principle. Cambridge Physics Huygen’s principle. http://www-outreach.phy.cam.ac.uk/camphy/xraydiffraction/xraydiffraction4_1.htm. April 19th.