On Part4, good stuff. Dude is a classic mad scientist!
*edit. Found this:
I heard a rumor that after Markham disappeared, a listener called Art to talk about a strange news story he had uncovered. Back in the 20's or 30's, police found a man dead on the beach in California. He was crushed to death inside a strange metal tube. The man was unrecognizable and a mysterious device was found near his body. The caller said the device looked like a cell phone in the photo. Markham told Art that he would take a cell phone with him if he ever tested the machine on himself.