Measuring and instructional ruler

Details Measuring and instructional ruler Measuring and instructional ruler

1997-03-07

1999-03-16

Fulton, Christopher W.

Geometrical instruments

Straightedge type

Rules

33491, 434195, G01B 302, G09B 1902, G09B 2302

Patent

active

058814698

ABSTRACT:
A measuring and instructional ruler device is provided for use by children and persons during the instruction of linear measurement, and for use in the measuring and drawing of objects. The device is comprised of a base panel having a top surface having standard units of measure delineated thereon, and at least one transparent sheet having fractional increments of the same standard unit of measure delineated thereon, wherein the transparent sheet is positionable over the base panel so that the delineated fractional increments of the standard unit of measure may be aligned with the delineated standard units of measure to demonstrate the relationship between the unit of measure and the fractional increments thereof.

REFERENCES:
patent: 396381 (1889-01-01), Yaggy
patent: 569358 (1896-10-01), Sommerfeldt
patent: 1174689 (1916-03-01), Coleman
patent: 1776245 (1930-09-01), Barrett
patent: 2926432 (1960-03-01), Helberg
patent: 2930146 (1960-03-01), Casel
patent: 4144657 (1979-03-01), Dumovich
patent: 4547969 (1985-10-01), Haack
patent: 4778390 (1988-10-01), Marans

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