Cold war calculators... These are circular slide rules made of laminated paper. Some of them make calculations that are nearly trivial. Others, like the one illustrated, use nomographs to solve problems quite challenging to do without a computer or specialized slide rule. I have a couple dozen examples of these in my collection. Amazingly, some of them are still being made – generally for tradesmen to use for complex calculations, such as the flow rate of water through pipes of various diameters...
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