Juhtmetega emakellaga ühendatud elektrikellade võrke hakati kasutama sellistes asutustes nagu tehased, kontorid ja koolid 1900. aasta paiku.
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Kaasaegsed raadiokellad sünkroniseeritakse raadiosignaalide või Interneti-ühenduste abil ülemaailmse ajasüsteemiga, mida nimetatakse koordineeritud maailmaajaks ja mida paljudes riikides juhivad esmakelladena aatomkellad.
Networks of electric clocks connected by wires to a master clock began to be used in institutions like factories, offices, and schools around 1900.
Good to know
Modern radio clocks are synchronised by radio signals or Internet connections to a worldwide time system called Coordinated Universal Time, which is governed by primary reference atomic clocks in many countries.
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