I have been searching for hours, pulled every book I could find and I can't find anything on Field Science that relates to Telsa. I did find theories on Magnetic Fields developed by Telsa; is that what you are referring to?
I have tried reading the site you keep promoting and honestly it's giving me quite the headache. Tiny white serif font on a bright red background. However without taking the colour choices into account the site actually raised more questions than it answered. I'm really looking into CS because we have started selling it where I work and I can't recommend it to anyone unless I know more.