Knocker uppersClockmaking advanced significantly in the 17th Century, says Handley, and there is evidence of people "mackling up their own alarm clocks when they go travelling, for example", she says. The first known mechanical alarm clock was invented in 1787, although it was only after the first patent was registered in 1876 that production became more widespread. Still, these wound spring alarm clocks were both unreliable and too expensive to be widely available for most people.
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You only need to look at a few of these to intuit the structure.