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2. 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 ...

3. 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 ...

4. Tesoro Corporation - Wikipedia

   en.wikipedia.org/wiki/Tesoro_Corporation

   Tesoro Corporation. Tesoro Corporation, known briefly as Andeavor, was a Fortune 100 [4] and a Fortune Global 500 company headquartered in San Antonio, Texas, with 2017 annual revenues of $35 billion, and over 14,000 employees worldwide. Based on 2017 revenue, the company ranked No. 90 in the 2018 Fortune 500 list of the largest United States ...

5. 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.

6. Ancient Roman gold and silver coins discovered with metal ...

   www.aol.com/news/ancient-roman-gold-silver-coins...

   A 34-year-old archaeologist named George Ridgway found a collection of more than 680 gold and silver coins with his metal detector in September 2019, according to a press release from Noonans ...

7. 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 ...