When did the job of knocker-upper exist?
Frequently Asked Question about the extinct profession: Knocker-Upper
The job of a knocker-upper existed in the 19th and early 20th centuries, before the widespread use of alarm clocks. In urban areas, knocker-uppers were employed to wake people up for work by tapping on their windows with long sticks. This job became obsolete with the invention and availability of affordable alarm clocks.