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By Karen Salazar. EARLY FORMS OF TIME- TELLING The Sun Sun-Dial.

Published byEsther Holt Modified over 9 years ago

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Presentation on theme: "By Karen Salazar. EARLY FORMS OF TIME- TELLING The Sun Sun-Dial."— Presentation transcript:

1 By Karen Salazar

2 EARLY FORMS OF TIME- TELLING The Sun Sun-Dial

3 WRIST WATCHES Small pocket watches, two to three inches in diameter, were available by the end of the nineteenth century. Mechanical wristwatches were an everyday item in the United States by the 1960s.

4 INVENTION OF THE “MICROCHIP” Microchip technology with quartz crystals Microchip is used to send signals to the dial of the watch Advantage: not a mechanical device w/ moving parts = does not wear out

5 QUARTZ A quartz watch uses the electricity from a piece of quartz from a battery

6 RAW MATERIALS Made of modern materials; plastics and alloy metals Cases can be made of either plastic or metal Microchips: made of silicon LED: made of gallium arsenide

7 CITATIONS http://bmwi.bimmerpost.com/forums/showthread.php?t=891519 http://www.madehow.com/Volume-1/Watch.html

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