After the shift (or a specified time period, up to 96 hours in the case of the Detex Guardsman clocks), an authorized person (usually a supervisor), would unlock the watchclock and retrieve the disk or tape and insert a new one. The paper disk or tape had the times pre printed and the key impressed the key number on the corresponding time. That key was then inserted into the clock, turned, and imprinted the disk with the key number. The user would carry the clock to each checkpoint where a numbered key was mounted (typically chained in place, ensuring that the user was present). Watchclocks often had a paper or light cardboard disk or paper tape placed inside for a set period of time usually 24 hours for disk models, and 96 hours for tape models. manufacturer of watchclocks, Detex, to discontinue all of their mechanical watchclocks on December 31, 2011, including the Detex Newman which had been manufactured for 130 years. This increase in the electronic systems led the largest U.S. Recently, electronic systems have increased in popularity due to their light weight, ease of use, and downloadable logging capabilities. The most commonly used form was the mechanical clock systems that required a key for manual punching of a number to a strip of paper inside with the time pre-printed on it. A watchclock station with key hanging on a chainĪ watchclock is a mechanical clock used by security guards as part of their guard tour patrol system which require regular patrols.
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