An early adding machine, c. 1890, invented by William Seward Burroughs, grandfather of the beat writer. National Museum of American History Today every phone is a calculator, but in the late 1800s, ...

Put away the laptop, the calculator and the adding machine – and try filing your taxes using an abacus. That’s right, an abacus. We haven’t always been as high-tech as we are today. Before there was ...