Because childbirth isn't painful and horrifying enough on its own, I guess, G.B. Blonsky, et. al. decided to provide "civilised women" with this medieval torture device birthing apparatus that applies centrifugal force to the mother, thereby allowing her a "quick and normal delivery." I shudder to think that this was ever tested on a person. Ptak Science Books has more images and information, should you be morbidly fascinated enough to look.