Steamer is an early term for any vessel power by a steam engine rather than sails.
The Delaware, an 1880s screw steamer
Early steamers were propelled by large paddlewheels. "Side-wheelers", with the paddlewheels on each side, were more seaworthy, and therefore more common in ocean waters, while "stern-wheelers", with a single large paddlewheel at the back, were more common as riverboats. Later, these were replaced by more efficient screw (or propeller) vessels.
Adonis - Tuesday March 8, 1859 - ran aground in bad weather, no casualties Rusland - Saturday March 17, 1877 - ran aground in bad weather, no casualties
A very small wreck, consisting of a primitive single-cylinder steam engine and a large, completely broken-down boiler. Odd pieces of pipe and machinery lie around, but no remains of a hull, although there appears to be some iron plating under the engine. Guessing from the technology, the construction would date to around 1860 +/- 10 years, and the sinking would have been sometime after that.