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  1. Pentagon helipad clock - September 11: Bearing Witness to ...

    ... Pentagon helipad clock Description: This Skilcraft electric wall clock, which hung in the Pentagon helipad fire station, was knocked to the ground by ...

    http://amhistory.si.edu/september11/collection/record.asp?ID=19

  2. Kitchen clocks | National Museum of American History

    ... The clock became an indispensable fixture in many kitchens in the late 1920s and 1930s—even before the electric ... Kitchen clocks, 1930s-1940s. ...

    http://americanhistory.si.edu/object-project/refrigerators/kitchen-clocks

  3. National Company (NATCO) Atomic Clocks Records, 1955 ...

    ... The first commerical atomic clock was invented by a team of physicists ... The company also researched other applications for the clocks, including a ...

    http://invention.si.edu/national-company-natco-atomic-clocks-records-1955-1968

  4. Harold Lyons Atomic Clocks Collection, 1935-1991 ...

    ... and construction of the first atomic clock in 1948. Archival material documenting Dr. Harold Lyons and his work with atomic clocks includes his ...

    http://invention.si.edu/harold-lyons-atomic-clocks-collection-1935-1991

  5. Domestic Furnishings | National Museum of American History

    ... of the advantages of spring-driven clocks. They vigorously explored various schemes for producing spring-driven clock movements without relying ...

    http://americanhistory.si.edu/collections/subjects/domestic-furnishings

  6. Penn Electric Tem-Clock Thermostat | National Museum of ...

    ... Penn Electric Tem-Clock Thermostat. Description This thermostat has a Type 772 Tem-Clock timing apparatus with a T-41 ...

    http://americanhistory.si.edu/ja/collections/search/object/nmah_1392744

  7. NMAH | On Time | Mechanizing Time

    ... imported coiled-steel springs in their shelf clocks. Joseph Ives in Brooklyn, New York, used a locally made strap spring for his wagon-spring clock. ...

    http://americanhistory.si.edu/ontime/mechanizing/revolution.html

  8. Guide to the National Company (NATCO) Atomic Clocks ...

    ... Atomic clocks are the most accurate of all clocks. The first clock in 1949 was based on the microwave resonances of the ammonia molecule. ...

    http://amhistory.si.edu/archives/AC0547.html

  9. Guide to the Harold Lyons Atomic Clocks collection NMAH.AC ...

    ... Clocks Records, 1955-1968 (AC0547), contains related archival materials, principally on the development of the first commercial atomic clock, the ...

    http://amhistory.si.edu/archives/AC0701.html

  10. NMAH | Peters Prints

    ... The Old Clock. Return to Results, Date made: 1839. Maker: Childs, John; Clay, Edward Williams. Place: New York, New York. ...

    http://amhistory.si.edu/petersprints/lithograph.cfm?id=325558&Category=Marriage&Results_Per=10&search_all=false

  11. NMAH | On Time | Marking Time

    ... Time for the Middle Class By 1800, clocks and watches were becoming more widely available and affordable. The tall case clock was the most ...

    http://americanhistory.si.edu/ontime/marking/status.html

  12. NMAH | On Time | Marking Time

    ... Even people who owned clocks and watches set their timepieces by the sun ... The dial on the tall case clock tracks the moon's waxing and waning; its ...

    http://americanhistory.si.edu/ontime/marking/nature.html

  13. "On Time" Opens at Smithsonian's National Museum of ...

    ... almost 200 clocks and watches with a wide variety of everyday objects to show how today's society has come to equate time with the clock. ...

    http://americanhistory.si.edu/press/releases/time-opens-smithsonians-national-museum-american-history

  14. Publications | Page 29 | National Museum of American History

    ... Clocks and the Depiction of the American Past, 1875–1900" with O'Malley, Michael. Bulletin of the National Association of Watch and Clock ...

    http://americanhistory.si.edu/about/publications?page=28

  15. NMAH | On Time | Synchronizing Time

    ... clocks became a fixture in bedrooms across the country—many people shared what one wag called "those perturbin' sleep disturbin', Alarm clock ...

    http://americanhistory.si.edu/ontime/synchronizing/discipline.html

  16. Carlene E. Stephens | National Museum of American History

    ... Clocks and the Depiction of the American Past, 1875–1900" with O'Malley, Michael. Bulletin of the National Association of Watch and Clock ...

    http://americanhistory.si.edu/profile/512

  17. NMAH | On Time | Expanding Time

    ... engineer working at Bell Telephone Laboratories, developed a clock that kept time using the vibrations of a quartz crystal. Quartz clocks were more ...

    http://americanhistory.si.edu/ontime/expanding/seconds.html

  18. NMAH | On Time | Image Enlargement

    Shelf clock, about 1875; with calendar; by Ithaca Calendar Clock Co., Ithaca, New York Gift of IBM Corporation Smithsonian Institution Image 99 ...

    http://americanhistory.si.edu/ontime/mechanizing/images/enlargements/99-36534.html

  19. NMAH | On Time | Image Enlargement

    Shelf clock, 1860; by Waterbury Clock Co. (now Timex Corp.), Waterbury, Connecticut Smithsonian Institution Image 98-4240. close window.

    http://americanhistory.si.edu/ontime/mechanizing/images/enlargements/98-4240.html

  20. NMAH | On Time | Image Enlargement

    Lantern clock, about 1680; by Joseph Hall, London; brought to Massachusetts by English emigrants from Bermuda about 1700 Gift of G. Norman ...

    http://americanhistory.si.edu/ontime/marking/images/enlargements/97-1752.html

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