Alarm Clocks

The ancient Greek philosopher Plato owned a large water clock with an alarm signal that sounded like a water organ. He used it at night, likely to signal the start of his lectures at dawn. This is one of the earliest recorded alarm clocks, and it already contained the essential idea: a device that forces a person to wake at a chosen time, against their body's natural inclination. The episode traces the alarm clock from Plato's water organ through medieval striking clocks, the first American patent in 1787, and the wartime shortages that made them a national priority, to the modern digital and radio-synced devices that sit on billions of bedside tables.

The Mechanical Origins

The episode explains that the first user-set mechanical alarm clocks appeared in 15th-century Europe. These early devices had a ring of holes in the clock dial, and the user set the alarm by placing a pin in the appropriate hole. The first American alarm clock was built in 1787 by Levi Hutchins in Concord, New Hampshire. He made it only for himself, and it rang at exactly 4 AM to wake him for his job. It was not adjustable. The French inventor Antoine Redier patented the first adjustable mechanical alarm clock in 1847.