The Magic Brain Calculator was a device used many years ago (mabye 1950's) to solve maths problems. It requires you reset it to all zero's to begin with and after a bit of practise you can solve many types of mathematical calculations. Clearing the device is just a matter of pulling the metal bar at the top of the machine and pushing it back in. Calculations of up to 8 digits can be performed such as addition, subtraction and multiplication.