Early prototype of the Simpson series 2 prosthetic arm, made with Meccano-like gears and welded rods activated by levers at the shoulder, metal, designed by David Simpson, Edinburgh, Scotland, late 1960s

Simpson series 2 prosthetic arms on harness, steel and plastic with silicone cosmetic covering, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh, designed by David Simpson, Edinburgh, late 1970s - early 1980s

Prosthetic arm, EMAS (Edinburgh Modular Arm System), the world's first bionic arm, designed as a modular system so the joints could be fitted to patients with a range of different prosthetic needs, metal and plastic, this arm was fitted to Robert Campbell Aird, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh, resulting from the research of David Gow, Edinburgh, 1998

Child's bilateral external powered prosthesis mounted on fabric harness, with plastic shell shoulders and articulated elbows, fitted with 'dolls' hands' with PVC cosmetic gloves, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh

Prosthtic forearm and hand with cotton harness, hand is Certalimid and leather, wrist has metal connection so hand can be removed and replaced with other tools such as pliers, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh, Certalimid manufactured by RSL Steeper Ltd, Rochester, Kent, 1925

Prototype of the Simpson series 1 prosthetic arm, gas powered, self levelling, metal, designed by David Simpson, Edinburgh, Scotland, 1964 - 1965

Simpson series 1 prosthetic arm, small arm with cylinder and piston, half covered with skin coloured sleeve, steel and plastic, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh, designed by David Simpson, Edinburgh, 1964 - 1965

Body powered prosthetic arm, elbow joint moves through a rack and pinion and push-rod movement, metal, foam padding and plastic, on canvas harness, part of the research and education collections of the Southeast Mobility and Rehabilitation Technology (SMART) Centre, Edinburgh, researcher David Gow, Edinburgh, early 1980s