Abacus with each counter held in position by friction or magneti

Details Abacus with each counter held in position by friction or magneti Abacus with each counter held in position by friction or magneti

1985-10-15

1986-12-16

Grieb, William H.

Education and demonstration

Mathematics

Arithmetic

G06C 100

Patent

active

046294295

ABSTRACT:
An abacus for performing calculations by sliding counters along partition walls extending vertically. Each counter has a spherical or beadlike head protruding above the body of the abacus, as well as a stem. Shafts extend horizontally through the partition walls and also through the stems of the counters. A hole is formed in each stem of the counters and horizontally extends partially through the stem. A compressed spring is mounted in each hole, and a small ball is attached to the front end of the spring. The side surface of each counter which is not in contact with the ball is pressed against the opposed partition wall by the action of the spring. Thus, the counters are maintained at their present positions even in a moving vehicle.

REFERENCES:
patent: 2527080 (1950-10-01), Rickard et al.
patent: 2872742 (1959-02-01), Schott
patent: 3387392 (1968-06-01), Kurz
patent: 3508348 (1970-04-01), Harada

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