The Calculator Geniuses Used 100 Years Ago
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The Calculator Geniuses Used 100 Years Ago
Ever seen a calculator that looks like a telescope? 🔭 Back in the 1920s, this cylindrical slide rule could handle multiplication, division, square roots, and even logarithms—no electricity needed. Merchants, bankers, and engineers carried it everywhere as a must-have tool. It was quick, portable, and surprisingly accurate. But once ...
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