Scale: Unknown. A model of a four-bladed propeller and a section of propeller shaft showing a method of connecting and disconnecting the propeller from the power source as proposed by W. Eames circa 1852. The propeller itself and parts of the frame have been made in brass, while the shaft, much of the disengaging gear, and section of crankshaft are made in steel. A hand written label has been pinned to the surface of the baseboard, which reads "Arrangement for connecting and disconnecting propeller shafts of marine engines in any position, Proposed by W. Eames C.E.R.N". Above this a paper label has been applied marked "4".

There seems to be a provision at the end of the crank shaft for a handle, but this is missing. Directly aft of the propeller is a shaped mahogany support and above this is a mahogany bed containing a smaller mahogany support and the apparatus for the disengaging gear. Protruding from the bed is a small steel handle, which can be turned but does not cause any movement. The crank shaft section is supported by three identical mahogany supports that are in turn connected by two shaped brass frames. These frames, together with the four mahogany supports and bed are mounted on a rectangular mahogany baseboard that sits on six identical turned wooden feet.