I’m of two minds about the “e’s” in the Morse code. Either they were a convenient way to get the code to space properly on the copper sheets or they are significant.
I recently got the idea that maybe they aren’t E’s at all but markers for specific letters that perhaps would spell something useful. The idea is that perhaps each E was under or above a significant letter and we would be able to take those letters and use them to spell out a message. This seemed to be a simple and easy way to impart needed information. In practice though, I didn’t find much. The E’s are all on the ends of the words and don’t seem to clearly indicate useful letters.
It was an interesting idea but did not work.