German Kriegsmarine 'Enigma' encoding machine housed in wooden case, serial M16744, with four code rotors, and a wooden case containing five spare rotors, of type used in German submarines, 1944

Loch Linnhe turbine, the world's first moored tidal stream kinetic energy conversion turbine for electricity generation, tested at Corran Narrows, Loch Linnhe from August 1993 till June 1994, designed by Peter Fraenkel of Marine Current Turbines Ltd, Stoke Gifford and manufactured by Powerstream plc, Launceston and G.P. Electronics, Bovey Tracey, 1992 - 1993

VERT rotor, conical screw compressor 22 bar in a single stage, metal on a wooden stand

VERT rotor, plastic (3D printed)

'Female' VERT rotor, black 25% carbon, with inscription, designed by VERT Rotors UK Ltd, 2015 - 2016

'Female' VERT rotor, beige or grey plastic, designed by VERT Rotors UK Ltd, 2015 - 2016

'Male' VERT rotor, yellow metal, designed by VERT Rotors UK Ltd, 2015 - 2016