Technology
Old parking meters tracked time using wound metal springs
HERE’S THE INTERESTING PART
Municipal sidewalks used to feature a coiled piece of metal ticking down your legal parking limits. Twisting the knob after inserting a coin literally wound up a crude internal clockwork mechanism. As the tightly wound mainspring slowly relaxed, a complex set of tiny brass gears turned a stark red flag dial upward, eventually announcing your violation to any passing officer.
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