Originally Posted by Trez
The book I have says:
"This most unusual weapon by New York inventor, David Dardick, Combines the magazine feed of a automatic, with the rotating cylinder of a revolver. The rounds were conventional commercial rounds (e.g. .38 Spl., 9mm Parabellum ) loaded into Trochoidail-shaped carriers called "Trounds""
I actually own one of these (and I've posted a 30 minute review video on Youtube), so I'd just like to clarify that the 38 caliber trounds were NOT just your everyday 38spl or 9mm rounds stuffed into a plastic sleeve. This is a common misconception.
The projectile was essentially a 38spl bullet, but the plastic (technically a 50s wonder-plastic called Celanese Fortiflex) held the powder charge and primer directly. As nitestalker says, you could reload them pretty easily with basically just your hands.
After Numrich bought out the company's inventory when it folded in the early 60s, they experimented with 9mm Luger and 38spl wadcutter adapters, but didn't make much progress and abandoned the idea amid fears of harming the guns. Only 50 had made it out of the factory, so it was probably a wise choice, although with all the leftover parts I'm sure Numrich could have made dozens more.
38 special rounds will absolutely not even fit in the gun - they're too long. I am hoping to eventually have some custom 38spl wadcutter adapters made so I can shoot the gun on video.
EDIT: By the way, as for the question "Is it a revolver or an automatic?" In my opinion, it's mostly a revolver, since your trigger finger is doing every bit of the work. During the couse of one single pull of the trigger, you're doing three things: loading a round into the cylinder, firing a round, and ejecting the previous round. It's really extremely clever and I wish the system were more robust and ergonomic. With some more design work, it could have potential, in my opinion.