I thought that some of these edison screw outlets would have been for use as fuseholders. Say you had a 20 amp branch circuit, and you could create a 15 amp sub-circuit by connecting the 20amp circuit to the center prong, and the 15 amp starts at the shell. Probably was never code to do that, though....
Another time I ran across some edison base fuses, and thought it was a strange kind of lightbulb. We had breakers in the house. I was 7. No, I didn't try them out in a lamp.... Think my father told me that they wern't light bulbs.
