Calculating Machine -

: Mechanical versions are powered by hand cranks; electronic versions use batteries, solar cells, or AC power. 3. How to Perform Basic Operations

: The "brain" that executes the math. In a Curta, this is a central stepped drum; in an electronic calculator, it is a microprocessor chip . calculating machine

: Mechanical machines show results through numbered windows on a carriage; electronic ones use LCD or LED screens. : Mechanical versions are powered by hand cranks;

Calculating machines are generally categorized by their operating mechanism: electronic versions use batteries