Abacus
Alternatively
referred to as the counting frame, an abacus
is a mechanical device used to assist a person in performing mathematical calculations.
In the picture to the right, is an example of what an abacus may look like.
- A great page containing complete information about counting boards and the abacus can be found at: http://www.ee.ryerson.ca/~elf/abacus/
- List of interactive Java Abacus
- Computer History
Also see: Calculator