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  2. DEC Professional - Wikipedia

    en.wikipedia.org/wiki/DEC_Professional

    The Professional 325 (PRO-325), Professional 350 (PRO-350), and Professional 380 (PRO-380) are PDP-11 compatible microcomputers. The Pro-325/350 were introduced in 1982 and the Pro-380 in 1985 by Digital Equipment Corporation (DEC) as high-end competitors to the IBM PC .

  3. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.

  4. Depth gauge - Wikipedia

    en.wikipedia.org/wiki/Depth_gauge

    A depth gauge is an instrument for measuring depth below a vertical reference surface. They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough ...

  5. Calipers - Wikipedia

    en.wikipedia.org/wiki/Calipers

    Vernier, dial, and digital calipers can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws, and in many cases depth by the use of a probe that is attached to the movable head and slides along the centre of the body.

  6. Micrometer - Wikipedia

    en.wikipedia.org/wiki/Micrometer

    Micrometer can mean: Micrometer (device), used for accurate measurements by means of a calibrated screw; Micrometre, a millionth of a metre

  7. Skin effect - Wikipedia

    en.wikipedia.org/wiki/Skin_effect

    Skin depth, δ, is defined as the depth where the current density is just 1/e (about 37%) of the value at the surface; it depends on the frequency of the current and the electrical and magnetic properties of the conductor. Induction cookers use stranded coils to reduce heating of the coil itself due to skin effect. The AC frequencies used in ...

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    Depth of the Challenger Deep in the Mariana Trench, the deepest-known point on Earth's surface 27 km Circumference of the Large Hadron Collider, as of May 2010 the largest and highest energy particle accelerator: 42.195 km Length of a marathon: 10 5: 100 km: 100 km The distance the IAU considers to be the limit to space, called the Karman line

  9. Fowler & Wells Company - Wikipedia

    en.wikipedia.org/wiki/Fowler_&_Wells_Company

    Orson Squire Fowler Charlotte Fowler Wells. The Fowler & Wells Company was a scientific institution that had a worldwide reputation. For 57 years, its founders and owners maintained an office in New York City, and were the recognized leaders in the phrenological, physiological, and hygienic sciences. For half a century, they were the main ...

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