Merlin's mechanical chair for the elderly or infirm: the design incorporates hand-cranks, wheels, gears and an adjustable back and footrest. Coloured etching with aquatint, 1811.

Licence: Public Domain Mark

Credit: Merlin's mechanical chair for the elderly or infirm: the design incorporates hand-cranks, wheels, gears and an adjustable back and footrest. Coloured etching with aquatint, 1811. Wellcome Collection. Source: Wellcome Collection.