Atomichron
Encyclopedia
The Atomichron was the world's first commercial atomic clock
, built by the National Company, Inc
of Malden, Massachusetts. It was also the first self-contained portable atomic clock and was a caesium standard
clock. More than 50 clocks with the trademarked Atomichron name were produced.
Atomic clock
An atomic clock is a clock that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element...
, built by the National Company, Inc
National Radio Company
The National Radio Company, headquartered in Malden, Massachusetts, USA was an American manufacturer of radio equipment from 1914 to 1991.-History:...
of Malden, Massachusetts. It was also the first self-contained portable atomic clock and was a caesium standard
Caesium standard
A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. They are one of the most accurate types of atomic clock...
clock. More than 50 clocks with the trademarked Atomichron name were produced.