Invented by Leonardo Torres in 1920, the Torres calculating machine is a machine that solves essential addition, subtraction, multiplication, and division problems using a simple manner. It was a ...

The first calculating machines multiplied by repeated addition. To multiple by tens, hundreds, or larger units, one shifted the carriage. From the 1870s, a few inventors proposed machines that could ...

Christie's said Wednesday it was suspending the Paris auction of one of just a handful of examples of the world's first calculating machine, developed by French mathematician and inventor Blaise ...