Japanese abacus interactive model from the 'Getting Your Sums Right' exhibition, Science Museum, London, April 2001. Getting Your Sums Right consists of three cases: 'Napier's bones', 'Mechanical counter' and 'Japanese abacus'. Each case has its own interactive exhibit positioned in front of it. These interactives were designed and fabricated by the Science Museum's Interactive Development Unit.
© Science Museum / Science & Society Picture Library