An alphabetical encyclopedia covering all aspects of science, the physical world, mechanics, and engineering.Logic. circuit. Logic as a subject was originally a branch of philosophy and was developed to improve the validity of ... the first computers used relay logic, as do many office machines, elevator control systems and industrial control systems.
|Title||:||The New Illustrated Science and Invention Encyclopedia|
|Author||:||Elaine Landry, Mark Dartford, Trevor Morris|