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  2. Philadelphia rod - Wikipedia

    en.wikipedia.org/wiki/Philadelphia_rod

    A Philadelphia rod is a level staff used in surveying. The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation ...

  3. Pitometer log - Wikipedia

    en.wikipedia.org/wiki/Pitometer_log

    This unit uses a mercury-based manometer to measure the difference in static and dynamic water pressure. Pitometer logs (also known as pit logs) are devices used to measure a ship's speed relative to the water. They are used on both surface ships and submarines. Data from the pitometer log is usually fed directly into the ship's navigation system.

  4. Electromagnetic log - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_Log

    Electromagnetic log. An Electromagnetic Log, sometimes called an "EM log", is an electronic sensor which measures the speed of a vessel through sea water. Like many other technologies, its name derives from the traditional chip log. It makes use of Faraday's law of induction by measuring the EMF induced in water moving through a magnetic field ...

  5. Chip log - Wikipedia

    en.wikipedia.org/wiki/Chip_log

    A chip log consists of a wooden board attached to a line (the log-line). The log-line has a number of knots at uniform intervals. The log-line is wound on a reel so the user can easily pay it out. Over time, log construction standardized. The shape is a quarter circle, or quadrant with a radius of 5 inches (130 mm) or 6 inches (150 mm), [1] and ...

  6. Total indicator reading - Wikipedia

    en.wikipedia.org/wiki/Total_indicator_reading

    Total indicator reading. In metrology and the fields that it serves (such as manufacturing, machining, and engineering), total indicator reading (TIR), also known by the newer name full indicator movement (FIM), is the difference between the maximum and minimum measurements, that is, readings of an indicator, on the planar, cylindrical, or ...

  7. 9 Best Pedometers - Healthline

    www.healthline.com/nutrition/best-pedometer

    Best for walking: 3D TriSport Walking Pedometer. Best for running: Garmin 010-12520-00 Running Dynamics Pod. Best value: Lintelek Fitness Tracker. High end: Garmin Vivosmart 4. Most user-friendly ...

  8. Time-domain reflectometer - Wikipedia

    en.wikipedia.org/wiki/Time-domain_reflectometer

    Time-domain reflectometer for cable fault detection. A time-domain reflectometer (TDR) is an electronic instrument used to determine the characteristics of electrical lines by observing reflected pulses. It can be used to characterize and locate faults in metallic cables (for example, twisted pair wire or coaxial cable), [1] and to locate ...

  9. Level staff - Wikipedia

    en.wikipedia.org/wiki/Level_staff

    The metric rod has major numbered graduations in meters and tenths of meters (e.g. 18 is 1.8 m - there is a tiny decimal point between the numbers). Between the major marks are either a pattern of squares and spaces in different colours or an E shape (or its mirror image) with horizontal components and spaces between of equal size.

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