Calculators National Museums Scotland collections contain a huge variety of objects and specimens. We want to encourage wider engagement with the collections and increase opportunities for them to be seen in new venues by new audiences. The calculators shown here are all available for long or short term loan. A History of Calculation Mathematics and calculation were subjects explored by ancient civilisations, but progress in calculation tools really took off in the 17th century illustrated here with a modern set of Napier's rods, which reduced the need for multiplication. Illustrating how calculation technology progressed in the 20th century is the Curta mechanical pocket calculator, first made in 1947, and the 1974 HP-35 pocket electronic calculator, a great example of a scientific tool as it did so much more than adding and subtracting! These tools and their functions were to be replaced by our 21st century computers and phones. Click on the images below to see a larger version and find out more about each object. Find out how to request a loan and see other collections available here.