S.S. Great Britain, Picture 25, Edited Version, Bristol, England (UK), 2012

The propeller on the S.S. Great Britain wasn't directly driven, as the engine was mounted transversely. This was probably a legacy of the design being changed during construction, from a paddlewheeler to a screw steamer. As a result, a Brunel (the designer) had to devise a chain drive. When his steam engine was replicated for the S.S. Great Britain's restoration, this had to be replicated as well, and here's part of it. The flywheel is one of the biggest single parts of the ship.