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Believe it or not but amateur time keeping is a growing hobby in the U.S. Picture is a homemade Caesium clock wherein atoms are fired through the barrel and measured at the other side. Pretty cool considering most atomic clocks are outrageously big in size and price. added on 2007-12-14

hacked caesium clock...

By: ilya

Who knew HP even made atomic clocks? This model was worth $60,000 when it was made in 1967 but now you can have it accurately setting all the clocks in your house for only $5k. The one in the auction still works. added on 2007-12-14

hp caesium clock...

By: ilya

As the predecessor to the NIST-7, it was 20 times less accurate. That doesn't stop it from looking cool though. added on 2007-12-14

By: ilya

As one of the cooler looking atomic clocks, the NIST-7 went online in 1993. It was about 20 times more accurate than its predecessor. added on 2007-12-13

nist-7 clock...

By: ilya

Not much info is given on this one outside of it being a Rubidium fountain clock. added on 2007-12-13

rubidium fountain clock...

By: ilya

One of the earliest Caesium clocks, quite a ways from modern day iterations. added on 2007-12-13

early caesium clock...

By: ilya

Rubidium clocks are the most compact method of atomic time keeping. These are commonly used on satellites. added on 2007-12-13

rubidium satellite clock...

By: ilya

first caesium clock...

By: ilya

Employed in 1970, this massive wrist watch was part of the Greenwich Time Service. It relayed its signals to other clocks via radio waves to establish an average. added on 2007-12-13

greenwich time service...

By: ilya

Created in 1955 the Caesium atomic clock was the most accurate of its time, only going off by a second approximately every 300 years. Today's atomic clocks stay accurate for up to 20 million years. added on 2007-12-12

caesium atomic clock...

By: ilya

This crazy looking planetary incinerator/atomic clock is kept in the National Institute of Standards and Technology and only gains or loses a second every 200,000 years. added on 2007-12-12

nbs-4 atomic clock...

By: ilya