Bob.....I know what you mean when a reporter writes "waterwheel" instead of "paddlewheel"....does he really know what he's writing about? But, I've noticed in other articles on steamboats written during this period, they pretty much all refer to "waterwheels". Perhaps, 150 years ago "waterwheel" was the accepted term. I really don't know.
The bigger question to me is....did Cannon really raise the wheels and shafts 18"? I wonder how we can find out?