The article link discusses the use of dry compressed air as the working gas in a high voltage switch. This switch was originally designed to operate in an insulating gas made with Sulfur Hexafluoride compound HF6 that are nasty to work with and hard on the actual atmosphere we breathe. Air is universally addictive, and rather OK to use as a non conductive gas to quench are ionization and provide heat dissipation in the switch. It turns out that it is effective and works. As voltages were increased, the only test modification needed was the increase in air pressure inside the switch. Nitrogen is 78 % of air, and a good insulator. It is also more insulating as it is compressed. The dielectric value of air is high at 1.0003XXX Permittivity (not ohms) Jim
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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