Abacus of Calculation (Magic Abacus)

This device is a simple wooden frame, about 8 by 10 inches. Several heavy wires are strung across the frame, parallel to one another. On each wire are 10 wooden balls. When mathematical formulas involving numbers (adding, subtracting, multipingly, dividing and simple operations) are spoken near the object, the balls shift about and the answer is spoken aloud by a disembodied voice.
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Anvils