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“Cory Doctorow, May 4, 2009 10: 08 PM Here's a good explanation of the workings of the "watchclock," a device carried by watchmen in order to allow their employers to check up on their patrolling.”
“He visits every checkpoint and clicks each unique key into the watchclock.”
“The key, literally, to the watchclock system is that the watchman is required to "clock in" at a series of perhaps a dozen or more checkpoints throughout the premises.”
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vanishedone Graphpaper.com: 'An elegant solution, designed and patented in 1901 by the German engineer A.A. Newman, is called the “watchclock�?. It’s an ingenious mechanical device, slung over the shoulder like a canteen and powered by a simple wind-up spring mechanism. It precisely tracks and records a night watchman’s position in both space and time for the duration of every evening. It also generates a detailed, permanent, and verifiable record of each night’s patrol.' May 5, 2009