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  2. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft, and a variable-shaped pickup coil. When the coil nears metal, the control box signals its presence with a ...

  3. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    A crystal detector includes a crystal, usually a thin wire or metal probe that contacts the crystal, and the stand or enclosure that holds those components in place. The most common crystal used is a small piece of galena; pyrite was also often used, as it was a more easily adjusted and stable mineral, and quite sufficient for urban signal ...

  4. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

  5. Rapiscan Systems - Wikipedia

    en.wikipedia.org/wiki/Rapiscan_Systems

    Rapiscan Systems is an American privately held company that specialises in walk-through metal detectors and X-ray machines for screening airport luggage and cargo. The company is owned by OSI Systems. [1] The company headquarters, in Torrance, California, USA, is the primary location for research and development, engineering, manufacturing ...

  6. Resistance thermometer - Wikipedia

    en.wikipedia.org/wiki/Resistance_thermometer

    Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a heat-resistant ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum (Pt), nickel (Ni), or copper (Cu).

  7. Beats Electronics - Wikipedia

    en.wikipedia.org/wiki/Beats_Electronics

    Beats Electronics. Beats Electronics LLC (also known as Beats by Dr. Dre, or simply Beats by Dre) is an American consumer audio products manufacturer headquartered in Culver City, California. [ 1 ][ 2 ] The company was founded in 2006 by music producer Dr. Dre and record company executive Jimmy Iovine. Since 2014, it has been an Apple subsidiary.

  8. List of metal detecting finds - Wikipedia

    en.wikipedia.org/wiki/List_of_metal_detecting_finds

    This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.

  9. Sony MDR-V6 - Wikipedia

    en.wikipedia.org/wiki/Sony_MDR-V6

    Sony MDR-V6. Sony MDR-V6 is a large diaphragm folding pair of headphones, the initial entry in Sony 's Studio Monitor headphones, one of the most popular model lines among professional audio engineers. The product line was augmented by the MDR-V600, the MDR-7506 and then the MDR-7509 and MDR-7509HD models, which continue to be popular for audio ...

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