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  2. Cascais tide gauge - Wikipedia

    en.wikipedia.org/wiki/Cascais_tide_gauge

    However, there were two problems with this; the fact that the addition of a digital system would affect the inflow and outflow of water into the analog well, and the impact of the new marina on the accuracy of the gauges, as a result of a delay in the arrival of the waves.

  3. Emerson Cavitation Tunnel - Wikipedia

    en.wikipedia.org/wiki/Emerson_Cavitation_Tunnel

    This equipment included pitot tubes, a tachometer, stroboscopic lighting equipment, contact meters and a vacuum pump. The tunnel was connected to an electrical supply in 1949 and entered service late in 1950, after technical problems called for recalibration of some of the instruments.

  4. Navigational instrument - Wikipedia

    en.wikipedia.org/wiki/Navigational_instrument

    Marine chronometer used to determine time at the prime meridian with great precision which is necessary when reducing sights in celestial navigation. Nocturnal used to determine apparent local time by viewing the Polaris and its surrounding stars. Ring dial or astronomical ring used to measure the height of a celestial body above the horizon ...

  5. Marine chronometer - Wikipedia

    en.wikipedia.org/wiki/Marine_chronometer

    A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

  6. Tide gauge - Wikipedia

    en.wikipedia.org/wiki/Tide_gauge

    Tide gauges have a practical application in the shipping and fishing industries where low or high tide levels can hinder or prohibit access to shallow bays or locations with bridges. An example is the Cascais tide gauge in Portugal, which was originally installed because of the sand bar in the River Tagus that causes difficulties for shipping ...

  7. John Harrison - Wikipedia

    en.wikipedia.org/wiki/John_Harrison

    John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.

  8. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

  9. NMEA 2000 - Wikipedia

    en.wikipedia.org/wiki/NMEA_2000

    NMEA 2000, abbreviated to NMEA2k or N2K and standardized as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols.