Oh, I think I know what you're referring to...the large (about 18-quart) roaster-ovens like the one my grandma used to roast her turkey. I have one, but haven't roasted a turkey in it yet, but I would imagine you could use the drippings in it to make a fine gravy. I would transfer the drippings, etc. to a pan on the stove, though, to make the gravy.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!