The Curta Calculator

TOTD can remember when, back in the mid-1980s, the Department of Geography still had a variety of whacky calculating devices. These included a number of pinwheel machines, and even a large desktop machine with a Nixie tube display ( Best of all though was the collection of Curta calculators, possibly the world’s smallest mechanical calculating machine. They looked like a pepper grinder and were beautifully engineered. Learn more about the Curta here:

When you’ve read the manual you can try the simulator here:

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