In 19th-century Britain and Ireland, professional 'knocker-uppers' tapped on bedroom windows with long bamboo poles to wake workers for morning shifts.
When mechanical alarm clocks were costly and unreliable, knocker-uppers walked early-morning routes—and wouldn't leave a client's window until the worker came to the glass to prove they were awake.
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Quick Guess: What were the 19th-century human alarm clocks who tapped on windows called?
Verified Answer: Knocker-uppers
Quiz Question: What were the 19th-century human alarm clocks who tapped on windows called?
Correct Answer: Knocker-uppers
Knocker-uppers used long poles or pea shooters to wake factory workers on time.
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