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  2. Silva compass - Wikipedia

    en.wikipedia.org/wiki/Silva_compass

    Silva Sweden AB created their first compass in 1928, and established their company in 1933. Below is a Chronological timeline of important dates in the history of Silva Sweden AB: [3] 1928 Gunnar Tillander invents the first orienteering (baseplate) compass. [4][5][6] 1932 The Silva Company is established in December 1932 by Tillander, Alvar ...

  3. Timeline of United States inventions (1890–1945) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    A Schrader valve consists of a hollow cylindrical metal tube, typically brass, with the exterior end threaded. The interior end takes a variety of forms depending on its application. In the center of the exterior end is a metal pin pointing along the axis of the tube; the pin's end is flush with the end of the valve body.

  4. Brunton compass - Wikipedia

    en.wikipedia.org/wiki/Brunton_compass

    Brunton compass. A Brunton compass, properly known as the Brunton Pocket Transit, is a precision compass made by Brunton, Inc. of Riverton, Wyoming. The instrument was patented in 1894 by Canadian-born geologist David W. Brunton. [1] Unlike most modern compasses, the Brunton Pocket Transit utilizes magnetic induction damping rather than fluid ...

  5. Qibla compass - Wikipedia

    en.wikipedia.org/wiki/Qibla_compass

    A qibla (qiblah) compass (sometimes also called qibla/qiblah indicator or qiblanuma) is a modified compass used by Muslims to indicate the direction to face to perform prayers. In Islam, this direction is called qibla, and points towards the city of Mecca and specifically to the Kaaba. While the compass, like any other compass, points north ...

  6. Luopan - Wikipedia

    en.wikipedia.org/wiki/Luopan

    Luopan. The luopan or geomantic compass is a Chinese magnetic compass, also known as a feng shui compass. It is used by a feng shui practitioner to determine the precise direction of a structure, place or item. Luo Pan contains a lot of information and formulas regarding its functions. The needle points towards the south magnetic pole.

  7. Faraday cage - Wikipedia

    en.wikipedia.org/wiki/Faraday_cage

    Faraday cage. A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields. A Faraday shield may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. Faraday cages are named after scientist Michael Faraday, who first constructed one in 1836.

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