Abstract :
THE OUTDOOR air switch is unique in that it is exposed to the elements and corrosive atmospheres for its entire life. Consequently, contacts and moving parts must give reliable service under conditions which no other equipment must face. In order to cope with these severe conditions, hundreds of ingenious mechanisms have made their appearance. These all have as their aim some auxiliary motion which breaks ice and corrosion with little effort before the main blade movement commences. This has resulted in a complicity of small levers, links, knuckles, gears, and so forth, which inherently cause trouble.
