Measuring and instructional ruler device

Details Measuring and instructional ruler device Measuring and instructional ruler device

1985-11-22

1986-09-30

Haroian, Harry N.

Geometrical instruments

Straightedge type

Rules

434196, G09B 912, B43L 700

Patent

active

046140425

ABSTRACT:
A measuring and instructional ruler device is provided for use by children and persons having learning impediments or physical handicaps. The device is comprised of a base panel having one inch subdivisions delineated by both visual indicia and tactile features, and a top panel adapted to slide upon the base panel and having a series of tabs whose widths sequentially increase in fractions of an inch. The device is used by aligning the first or zero subdivision with a first of two points between which the distance is to be measured, determining the appropriate subdivision closest to the second point, and adding to such closest subdivision the fractional value of the tab that fills the space between the end of the closest subdivision and the second point of the distance being measured.

REFERENCES:
patent: 1594376 (1926-08-01), Passmore
patent: 2289717 (1942-07-01), Montgomery
patent: 2371325 (1945-03-01), Wessborg
patent: 2803069 (1957-08-01), Struna
patent: 2835988 (1958-05-01), Hilkene
patent: 3805395 (1974-04-01), Hopkinson
patent: 3871114 (1975-03-01), Honig

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