Operations processor

Details Operations processor Operations processor

1989-12-12

1991-04-16

Apley, Richard J.

Education and demonstration

Mathematics

Arithmetic

434188, G09B 1902

Patent

active

050078402

ABSTRACT:
An operations processor for facilitating memory of the 12 times table. The operations processor comprises two concentric cylinders, the inner cylinder having marked thereon a periodical array of numbers. The outer clinder arranged for indicating one of the operands and the solution to a particular multiplication. A user merely twists and raises or lowers the inner cylinder with respect to the outer cylinder thereby displaying any sum of the 12 times table.

REFERENCES:
patent: 613432 (1898-11-01), Szenhak
patent: 924406 (1909-06-01), Walker
patent: 1158774 (1915-11-01), Beard
patent: 1161685 (1915-11-01), James
patent: 1720499 (1929-07-01), Walker
patent: 4714429 (1987-12-01), Phillips

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