A 100-year history of generator insulation systems

Having joined General Electric (GE) in 1950, and having worked closely with the "old timers" of that day, my knowledge base goes back into the teen years of the 1900s-a span of a century. No guarantee is offered that all the information is exactly correct, but the essence should be acceptably close to give a good understanding of the difficult evolution to the present designs of turbine-generators.