Scale: Unknown. A large scale design model of a two bladed propeller as invented by Mr Griffiths. The model is made entirely of wood with the shaft and boss having been turned on a lathe, while the two blades have been carved separately and are attached to the boss with circular dowels. At the forward end of the shaft is a circular plate with a cross piece used for engaging and disengaging the propeller to the main drive shaft. The whole model is finished in a dark brass-bronze colour. The outer edges of the blades have been damaged and are split along the grain. There is a paper printed label glued to one of the blades which reads 'GRIFFITHS PATENT SCREW PROPELLOR'