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2. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

3. Fluxgate compass - Wikipedia

   en.wikipedia.org/wiki/Fluxgate_compass

   A fluxgate inclinometer/compass. The basic fluxgate compass is a simple electromagnetic device that employs two or more small coils of wire around a core of highly permeable magnetic material, to directly sense the direction of the horizontal component of the Earth's magnetic field. The advantages of this mechanism over a magnetic compass are ...

4. Longues-sur-Mer battery - Wikipedia

   en.wikipedia.org/wiki/Longues-sur-Mer_battery

   The Longues-sur-Mer battery (German: Marineküstenbatterie (MKB) Longues-sur-Mer; also designated Widerstandsnest (Wn) 48) [1] is a World War II German coastal artillery battery approximately 1 km (0.62 mi) north of the village of Longues-sur-Mer in Normandy, France. The battery is sited on a 60 m (200 ft) cliff overlooking the Baie de Seine ...

5. 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.

6. Maisy battery - Wikipedia

   en.wikipedia.org/wiki/Maisy_battery

   The Maisy Battery is a group of World War II artillery batteries that was constructed in secret by the German Wehrmacht near the French village of Grandcamp-Maisy in Normandy. It formed a part of Germany 's Atlantic Wall coastal fortifications and was the principal position of defence for that area. It was responsible for the defence of the ...

7. 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 ...