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  2. Oil-lamp clock - Wikipedia

    en.wikipedia.org/wiki/Oil-lamp_clock

    Water clocks or clepsydra measure a gain or loss of water by using drops of uniform size and frequency. The Persian fenjaan made use of the constant time it took for the sinking of a floating bowl with a hole in its underside. It is unknown when or where the oil-lamp clock was first introduced. This clock was mainly used during the mid-18th ...

  3. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    An astronomical (or astronomic) timer calculates dawn and dusk times (tracking the sun position) for each day of the year based on the latitude and longitude (or just north/central/south and time zone on more cheaply made ones), and the day of the year (month and date), programmed by the user upon installation in addition to the usual time of day, except in the case of GPS enabled astronomic ...

  4. Utility submeter - Wikipedia

    en.wikipedia.org/wiki/Utility_submeter

    This technology is used to get from meter reading to billing by an automated electronic means. This can be by handheld computers that collect data using touch wands, walk or drive-by radio, fixed network systems where the meter has a transmitter or transceiver that sends the data to a central location, or transmission via Wi-Fi , cellular , or ...

  5. Automatic meter reading - Wikipedia

    en.wikipedia.org/wiki/Automatic_meter_reading

    Automatic meter reading (AMR) is the technology of automatically collecting consumption, diagnostic, and status data from water meter or energy metering devices (gas, electric) and transferring that data to a central database for billing, troubleshooting, and analyzing. This technology mainly saves utility providers the expense of periodic ...

  6. Automatic faucet - Wikipedia

    en.wikipedia.org/wiki/Automatic_faucet

    A hands-free faucet in Japan. An automatic faucet or tap (also hands-free faucet, touchless faucet, electronic faucet, motion-sensing faucet, sensor faucet, or infrared faucet) is a faucet equipped with a proximity sensor and mechanism that opens its valve to allow water to flow in response to the presence of a user's hands in close proximity.

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