Ermmm…
If you must know, this was a 1958 US Navy study on the effect of being upside down for extended periods, apparently in preparation for spaceflight. The actual applicability of this to spaceflight biology seems dubious, but whatever. More photos of this are HERE, and the Life magazine article on this is HERE.
The feller in the photo is Dr. Dietrich Beischer. He, as the name implies, appears to have been a German scientist, and what there is online about him indicates that he was brought to the US after WWII as part of Project Paperclip. Look him up on Google and you’ll find a lot of jibberjabber about conspiracy theories, but it does appear that another one of his fun little projects was exposing US Navy sailors to microwave radiation.
Damn, son, way to live up to those old mad scientist cliches…