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seth thomas from the united states patented the mechanical wind - up alarm clock in 1876 . this clock didn't only keep time , it also allowed a person to set a ' wake-up time ' and would ring a bell at the time the sleeper had set for awakening . Battery - powered clocks were first used in the 1840s , with... 顯示更多 seth thomas from the united states patented the mechanical wind - up alarm clock in 1876 . this clock didn't only keep time , it also allowed a person to set a ' wake-up time '
and would ring a bell at the time the sleeper had set for awakening .
Battery - powered clocks were first used in the 1840s , with electric and quartz - powered
clocks coming into use in the early 1900s . with the invention of battery and electric
- powered clocks , there was no longer the need to wind a mainspring . as a result , time
- keeping became much more accurate .
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