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  2. Watchclock - Wikipedia

    en.wikipedia.org/wiki/Watchclock

    A watchclock is a mechanical clock used by security guards as part of their guard tour patrol system which require regular patrols. 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.

  3. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card

  4. Barograph - Wikipedia

    en.wikipedia.org/wiki/Barograph

    This is to adjust the barograph so that it correctly reflects the station pressure. Barely visible below the knob is a small silver plunger. This is pressed every three hours to leave a time mark on the paper. The line between two of these marks is called the 'characteristic of barometric tendency' and is used by weather forecasters. The ...

  5. Slave clock - Wikipedia

    en.wikipedia.org/wiki/Slave_clock

    The "program clock" is a timer that can be programmed with punched paper tape to ring bells or turn machines on and off at preprogrammed times. In telecommunication and horology, a slave clock is a clock that depends on another clock, the master clock.

  6. Clock network - Wikipedia

    en.wikipedia.org/wiki/Clock_network

    The master clock in a clock network can receive accurate time in a number of ways: through the United States GPS satellite constellation, a Network Time Protocol server, the CDMA cellular phone network, a modem connection to a time source, or by listening to radio transmissions from WWV or WWVH, or a special signal from an upstream broadcast network.

  7. Raymond Saunders (clockmaker) - Wikipedia

    en.wikipedia.org/wiki/Raymond_Saunders_(clockmaker)

    Raymond Saunders (Feb. 7, 1940 to Nov. 23, 2024) was a Canadian clockmaker who has designed and built more than 150 customized clocks that mainly serve as tourist-attracting public artworks. In 1977 he was commissioned to build a steam clock for the Gastown district of Vancouver , Canada. [ 1 ]

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96] By 1341, clocks driven by weights were familiar enough to be able to be adapted for grain mills, [97] and by 1344 the clock in London's Old St Paul's Cathedral had been replaced by one with an escapement. [98]