Mathematical teaching aid

Details Mathematical teaching aid Mathematical teaching aid

1973-10-11

1976-04-13

Grieb, Wm. H.

G09B 1902

Patent

active

039494918

ABSTRACT:
This invention relates to a mathematical teaching aid comprising a beam which has two parallel longitudinal upper faces each face being divided up by equally spaced marks representing numbers, the numbers on one face progressing from 0 at one end to n at the other end of the beam face, the numbers on the other face progressing from 0 at the mid-point of the face to n/2 at one end and -(n/2) at the other end of the beam face.

REFERENCES:
patent: 230619 (1880-08-01), Darling
patent: 1273086 (1918-07-01), Newell
patent: 1595422 (1926-08-01), Rose
patent: 2494469 (1950-01-01), Booth
patent: 3212202 (1965-10-01), Heinichen
patent: 3353284 (1967-11-01), Hursh et al.
patent: 3526045 (1970-09-01), Stone

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