Shortt Synchronome free pendulum clock



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English: A Shortt-Synchronome free pendulum clock belonging to the US National Institute of Standards and Technology (NIST), in the NIST Museum, Gaithersburg, Maryland, USA. Invented in 1921 by William Hamilton Shortt, it was the most accurate mechanical clock ever manufactured, achieving an accuracy of around one second per year. This example was purchased by NIST in 1929 and used by physicist Paul R. Heyl in his second determination of the gravitational constant. Alterations to image: brightened slightly, changed from GIF to JPEG.
Date Not known
Source Downloaded 2009-12-29 from Highlights of the NIST Museum, NIST Virtual Museum, US National Institute of Standards and Technology website. No source information or copyright notice was given.
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Public domain because it is work of the US National Institute of Standards and Technology. Copyright notice on the website:
"These World Wide Web pages are provided as a public service by the National Institute of Standards and Technology (NIST). With the exception of material marked as copyrighted, information presented on these pages is considered public information and may be distributed or copied"


Public domain This image is in the public domain because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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