Pendulum Clock By: Junho, Dh

What is this invention -Pendulum Clock -Pendulum -16 th century

History 1582 – Galileo fixed period Dutch Scientist Christian Huygens 1880s- The grandfather clock Designs improve

Purpose Save time Keep promise/meeting Accurate time

How it works? Swing back and forth Time base – gears Small gear rotate Each gear, face of the clock

How simple machine… Controlled force Self working

One World Sociable Keep Meetings and promises Friend ship

Advantages Sociable Keep time well Accurate time

Disadvantage Need battery/ resource When time is not set

Bibliography -History of the pendulum clock." Grandfather clocks info: Facts about long case clocks. grandfather clocks guide, n.d. Web. 20 Apr clock.html. clock.html -Huygen’s principle. Cambridge Physics Huygen’s principle. outreach.phy.cam.ac.uk/camphy/xraydiffraction/xraydiffraction4_1.htm. April 19 th. 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) April 19, Lilley,Stephen. How a clocks work. Ehow How a clocks work -Pendulum Clock. Wikipedia Pendulum Clock -Simple machine. Science Learning simple machine. April 19, U+2212 MINUS SIGN. Decodeunicode U+2212 MINUS SIGN. April 19,

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