There is no account of the supposed experiment before c.1955. A book was published in 1953 about UFOs, by Jessup, detailing possible propulsion systems they might use. A guy called Carlos Allende (or Carl Allen - he went by a number of names) then got in touch with him to relate the story of the PE. The original book has been expanded, I believe, to include those letters: http://www.amazon.co.uk/The-Case-UF...&qid=1370205567&sr=8-4&keywords=morris jessup There's no link to anything else that I'm aware of - as it seems to be fairly well accepted that this was the original source of the story that we are familiar with. And given what was going on back in 1943, with degaussing experiments (which enables ships to be invisible to mines) it does not take much embellishment to change those to some fantastical experiments claiming invisibility to light (i.e. as in the ships disappearing from view). I don't think the PE was any "nasty" exercise - just one man's misunderstanding that captured the imagination of others, including some that saw it as a cover-up etc, fuelled by the paranoia of the day (cold-war etc). UFOs were (and still are) generally explained by rather mundane things. The 1940s - including during WW2 - saw many designs of aircraft that would have appeared like flying saucers, with strange designs continuing as the aero-industry really took off (no pun intended). And I believe the first "saucer" in the sky was reported back in the 19th century... and "foo-fighters" were reported throughout WW2. But unless there is evidence to suggest otherwise, it is more reasonable to assume the explanation of anything is mundane rather than anything that might defy (our current understanding) physics, or involve ETs etc.