Propellers were high-tech gadgets in the early 1860's. It's possible the Seneca had one bit I'd bet against it. If you can get a picture of the "Osipee" I would expect to find the same type of propulsion (as suggested above) since it would be more expensive to rebuild the power-plant to another configuration.
Please don't conclude that I am saying our forbears were cheap-skates but they do have a reputation for being thrifty!
