[time-nuts] Fwd: [New post] 100 Year Old Atomic Clock

[djl]

fyi, Don 

-------- Original Message -------- 

 		SUBJECT:
 		[New post] 100 Year Old Atomic Clock

 		DATE:
 		2019-09-25 11:03

 		FROM:
 		Hackaday <donotreply at wordpress.com>

 		TO:
 		djl at montana.com

 Gregory L. Charvat posted: "Precision time is ubiquitous today thanks
to GPS and WWVB. Even your Macbook or smartphone displays time which is
synchronized to the NIST-F1 clock, a cesium fountain atomic clock (aka
the 'Atomic Clock') that is part of a global consortium of atomic cloc" 

NEW POST ON HACKADAY

100 YEAR OLD ATOMIC CLOCK [1]

 by Gregory L. Charvat [2] 

Precision time is ubiquitous today thanks to GPS and WWVB. Even your
Macbook or smartphone displays time which is synchronized to the NIST-F1
[3] clock, a cesium fountain atomic clock (aka the 'Atomic Clock') that
is part of a global consortium of atomic clocks known as Coordinated
Universal Time (UTC). Without precise timing there would be train
collisions, markets would tumble, schools would not start on time, and
planes would fall out of the sky. 

But how was precision timing achieved in the 19th century during the era
of steam, brass, and solenoids? One of the first systems of precision
timing kept trains running safely and on time, rang the bells at school,
and kept markets trading by using a special clock designed by the Self
Winding Clock Company. Through measurements of celestial objects by the
US Naval Observatory, and time synchronization pulses broadcast by the
Western Union telegraph network, this system synchronized time across
the United States in an era where the speed of our train system was
out-pacing by the precision of our clocks. 

Those clocks were designed so well that many of them are still around
and functioning. One of these 100-year-old self-winding clocks made its
way onto my workbench. I did what any curious hacker would do, figured
out how the synchronization worked and connected it to a clock source
with atomic precision. Let's take a look! 

Read more of this post [4] 

GREGORY L. CHARVAT [2] | September 25, 2019 at 10:01 am | URL:
https://wp.me/paBn4l-1zSR 

 		Comment [5]
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-- 

Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304 

Links:
------
[1] https://hackaday.com/2019/09/25/100-year-old-atomic-clock/
[2] https://hackaday.com/?author=48350060
[3]
https://www.nist.gov/pml/time-and-frequency-division/primary-standard-nist-f1
[4]
https://hackaday.com/2019/09/25/100-year-old-atomic-clock/#more-376269
[5] https://hackaday.com/2019/09/25/100-year-old-atomic-clock/#respond
[6] https://hackaday.com/2019/09/25/100-year-old-atomic-clock/#comments
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