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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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